Rosemount 644 руководство по эксплуатации

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  Reference Manual 00809-0100-4728, Rev MB July 2016 ™ Rosemount 644 Temperature Transmitter ® with HART Protocol For product shipped before September 2012…

• Page 3: Table Of Contents

  Reference Manual Contents 00809-0100-4728, Rev MB July 2016 1Section 1: Introduction Manual overview …………..1 Transmitter overview .

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  Contents Reference Manual 00809-0100-4728, Rev MB July 2016 2.7.4 Sensor Drift Alert configuration……….23 Configure device outputs.
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  Reference Manual Contents 00809-0100-4728, Rev MB July 2016 4Section 4: Electrical Installation Overview …………… . 53 Safety messages.
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  Contents Reference Manual 00809-0100-4728, Rev MB July 2016 7Section 7: Safety Instrumented Systems (SIS) Certification Safety Instrumented Systems (SIS) certification ……..77 Rosemount 644 safety certified identification .
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  Considerations …………. 96 Specifications and Reference Data for Rosemount 644 HART Head Mount ….97 A.6.1…
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  Contents Reference Manual 00809-0100-4728, Rev MB July 2016 D.4.2 Canceling …………..124 LOI menu tree .
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  Reference Manual Title Page 00809-0100-4728, Rev MB July 2016 ™ Rosemount 644 Temperature Transmitter Rosemount 644 Hardware Revision 30 Device Revision ® HART Revision Read this manual before working with the product. For personal and system safety, and for optimum product performance, make sure to thoroughly understand the contents before installing, using, or maintaining this product.
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  The products described in this document are NOT designed for nuclear-qualified applications. Using non-nuclear qualified products in applications that require nuclear-qualified hardware or products may cause inaccurate readings. ™ For information on Rosemount nuclear-qualified products, contact an Emerson Process Management Sales Representative. Title Page…

• Page 11: Manual Overview

  Head Mount and 644 Rail Mount Transmitters with the HART protocol. Section 2: Configuration This section provides instruction on the commissioning and operating of the Rosemount 644 HART Transmitter. The information explains how to configure software functions and many configuration parameters on an Asset Management System, a Field Communicator, and the Local Operator Interface display option.

• Page 12: Transmitter Overview

  Completely encapsulated electronics to ensure long term transmitter reliability  Refer to the following literature for a full range of compatible connection heads, sensors, and ™ thermowells provided by Emerson Process Management. Temperature Sensors and Assemblies Product Data Sheet, Volume 1 (document number …

• Page 13: Mechanical

  Reference Manual Introduction 00809-0100-4728, Rev MB July 2016 Make sure the instruments in the loop are installed in accordance with intrinsically safe, or non-incendive field wiring practices. 1.3.3 Mechanical Location When choosing an installation location and position, take into account the need for access to the transmitter.

• Page 14: Return Of Materials

  Return of materials ™ To expedite the return process in North America, call the Emerson Process Management National Response Center toll-free at 800-654-7768. This center, available 24 hours a day, will assist you with any needed information or materials.

• Page 15: Transmitter Security

  Reference Manual Introduction 00809-0100-4728, Rev MB July 2016 Note If a hazardous substance is identified, a Material Safety Data Sheet (MSDS), required by law to be available to people exposed to specific hazardous substances, must be included with the returned materials.

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  Reference Manual Introduction 00809-0100-4728, Rev MB July 2016 Introduction…

• Page 17: Overview

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Section 2 Configuration Overview …………….page 7 Safety messages .

• Page 18: System Readiness

  Configuration Reference Manual 00809-0100-4728, Rev MB July 2016 Failure to follow these installation guidelines could result in death or serious injury. Make sure only qualified personnel perform the installation.  Explosions could result in death or serious injury. Do not remove the connection head cover in explosive atmospheres when the circuit is live. …

• Page 19: Confirm Correct Device Driver

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 2.3.1 Confirm correct device driver Verify the latest Device Driver files are loaded on your systems to ensure proper communications.  Download the latest Device Driver at www.EmersonProcess.com or www.HartComm.org  Table 2-1. Rosemount 644 Device Revisions and Files Software Find device driver Review…

• Page 20: Configuring On The Bench

  Configuration Reference Manual 00809-0100-4728, Rev MB July 2016 2.4.1 Configuring on the bench To configure on the bench, required equipment includes a power supply, a digital multimeter (DMM), and a Field Communicator, AMS Device Manager, or a Local Operator Interface (LOI – Option M4). Connect the equipment as shown in Figure 2-1.

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  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Turn on the Field Communicator by pressing the ON/OFF key. The Field Communicator will search for a HART-compatible device and indicate when the connection is made. If the Field Communicator fails to connect, it indicates that no device was found.

• Page 22: Setting The Loop To Manual

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Figure 2-3. LOI Configuration Buttons A. Configuration buttons Table 2-2. LOI Button Operation Button Left SCROLL Right ENTER Local Operator Interface password A Local Operator Interface Password can be entered and enabled to prevent review and modification of device configuration via the LOI.

• Page 23: Hart Software Lock

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 by the factory or using the Field Communicator.The values to which the transmitter drives its output in failure mode depend on whether it is configured to standard, NAMUR-compliant, or custom operation. “Hardware and Software Failure Mode” on page 108 for standard and NAMUR-compliant operation parameters.

• Page 24: Using Ams Device Manager

  Configuration Reference Manual 00809-0100-4728, Rev MB July 2016 Figure 2-4. Rosemount 644 Device Dashboard Fast Key Sequences Fast Key Sequence Function HART 5 HART 7 Alarm Values 2, 2, 5, 6 2, 2, 5, 6 Damping Values 2, 2, 1, 5 2, 2, 1, 6 Lower Range Value (LRV) 2, 2, 5, 5, 3…

• Page 25: Basic Configuration Of The Transmitter

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Using a Field Communicator From the HOME screen, enter the Fast Key sequence 3, 2, 1 Device Dashboard Fast Keys Using AMS Device Manager Right click on the device and select Service Tools from the menu. The Variables tab displays the following process variables: Primary, Second, Third and Fourth variables, as well as the Analog Output …

• Page 26: Configuring The Sensor(S)

  Configuration Reference Manual 00809-0100-4728, Rev MB July 2016 The Rosemount 644 dual-sensor option configuration screens allow selection of the primary variable (PV), secondary variable (SV), tertiary variable (TV), and quaternary variable (QV). Variable choices are: Sensor 1  Sensor 2 …

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  EXIT MENU EXIT MENU * Available only if option code (S) is ordered. Contact a Emerson Process Management representative for information on the temperature sensors, thermowells, and accessory mounting hardware that is available through Emerson Process Management. 2-wire RTD offset…

• Page 28: Setting Output Units

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 1. Measure the lead wire resistance of both RTD leads after installing the 2-Wire RTD and Rosemount 644. 2. Navigate to the 2-Wire RTD Offset parameter: 3. Enter the total measured resistance of the two RTD leads at the 2-Wire Offset prompt to ensure proper adjustment.

• Page 29: Configure Dual Sensor Options

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Using a Field Communicator HART 5 HART 7 From the HOME screen, enter the Fast Key sequence 2, 2, 1, 4 2, 2, 1, 5 Device Dashboard Fast Keys Using AMS Device Manager 1.

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  Configuration Reference Manual 00809-0100-4728, Rev MB July 2016 Note This procedure assumes the Differential Temperature is a calculated output of the device but does not re-assign it as the Primary Variable. If it desired for Differential to be the transmitter’s primary variable “Mapping the HART variables”…

• Page 31: Average Temperature Configuration

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 2.7.2 Average temperature configuration The Rosemount 644 Transmitter ordered and configured for dual-sensors can output and display the Average temperature of any two inputs. Use the following procedures to configure the transmitter to measure the average temperature: Note This procedure assumes the Average Temperature is a calculated output of the device but does not…

• Page 32: Hot Backup Configuration

  Configuration Reference Manual 00809-0100-4728, Rev MB July 2016 Figure 2-11. Configuring Average Damping with LOI VIEW CONFIG PV DAMP CALIBRAT SENSOR CONFIG DAMPING DAMPING SENSOR 1 DAMP UNITS UNITS SENSOR 2 DAMP* VARIABLE MAP RERANGE DIFFRNTL DAMP* LOOP TEST AVERAGE DAMP AVERAGE DAMP* ALARM SAT VALUES DISPLAY…

• Page 33: Sensor Drift Alert Configuration

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Hot Backup configuration with a Field Communicator The field communicator will walk you through a method to correctly configure the necessary elements of the Hot Backup feature. From the HOME screen, enter the Fast Key sequence 2, 1, 5 Device Dashboard Fast Keys Hot Backup configuration with AMS Device Manager…

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  Configuration Reference Manual 00809-0100-4728, Rev MB July 2016 Though it defaults to WARNING, when configuring the transmitter for Sensor Drift Alert, the user also has the option of specifying that the analog output of the transmitter go into ALARM when sensor drifting is detected.

• Page 35: Configure Device Outputs

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Note Enabling the Drift Alert Option to WARNING will set a flag (through the HART communications) whenever the maximum acceptable difference between Sensor 1 and Sensor 2 has been exceeded. For the transmitter’s analog signal to go into ALARM when Drift Alert is detected, select Alarm during the configuration process.

• Page 36: Damping

  Configuration Reference Manual 00809-0100-4728, Rev MB July 2016 Figure 2-14. Reranging the transmitter with LOI ENTER VALUES ENTER VALUES VIEW CONFIG BACK TO MENU SENSOR CONFIG EXIT MENU UNITS RERANGE RERANGE BACK TO MENU LOOP TEST EXIT MENU DISPLAY EXTENDED MENU EXIT MENU 2.8.2 Damping…

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  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Figure 2-15. Change in Input vs. Change in Output with Damping Set to 5 Seconds Damping can be applied to a number of parameters in the Rosemount 644 Transmitter. Variables that can be damped are: Primary Variable (PV) …

• Page 38: Configure Alarm And Saturation Levels

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Using Local Operator Interface Reference the figure below to find the Damping configuration path on the LOI. VIEW CONFIG PV DAMP CALIBRAT SENSOR CONFIG DAMPING DAMPING SENSOR 1 DAMP UNITS SENSOR 2 DAMP* VARIABLE MAP RERANGE DIFFRNTL DAMP*…

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  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Table 2-5. Custom Alarm and Saturation Values Level 4–20 mA saturation 4–20 mA alarm 3.7 mA — 3.9 mA 3.6 mA — 3.8 mA High 20.1 mA — 22.9 mA 20.2 mA — 23.0 mA Note Transmitters set to HART multidrop mode send all saturation and alarm information digitally;…

• Page 40: Configuring The Lcd Display

  Configuration Reference Manual 00809-0100-4728, Rev MB July 2016 2.8.4 Configuring the LCD display The LCD display configuration command allows customization of the LCD display to suit application requirements. The LCD display will alternate between the selected items with each item displaying for a 3- second interval.

• Page 41: Inputting Device Information

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Using Local Operator Interface Reference the figure below to find the Alarm and Saturation value configuration path on the LOI. Figure 2-18. Configuring Alarm and Saturation Values with LOI SENSOR 1 SENSOR 2* VIEW CONFIG ANALOG SENSOR CONFIG…

• Page 42: Configure Measurement Filtering

  Configuration Reference Manual 00809-0100-4728, Rev MB July 2016 Using a Field Communicator From the HOME screen, enter the Fast Key sequence 1, 8 Device Dashboard Fast Keys Using AMS Device Manager 1. Right click on the device and select Configure. 2.

• Page 43: 2Resetting The Device

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Configuring 50/60 Hz filter with AMS Device Manager Right click on the device and select Configure. 1. In the left navigation pane choose Manual Setup. 2. On the Device Tab there will be a group box called Noise Rejection, in the box AC Power Filter choose from the drop down menu.

• Page 44: 4Open Sensor Holdoff

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Using a Field Communicator The following steps indicate how to turn the Intermittent Sensor Detect or Transient Filter) feature ON or OFF. When the transmitter is connected to a Field Communicator, use the Fast Key sequence and choose ON (normal setting) or OFF.

• Page 45: Diagnostics And Service

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 2.11 Diagnostics and service 2.11.1 Performing a loop test The Analog Loop Test verifies the output of the transmitter, the integrity of the loop, and the operations of any recorders or similar devices installed in the loop. To initiate a loop test, follow the steps below. The host system may provide a current measurement for the 4-20 mA HART output.

• Page 46: 3Thermocouple Degradation Diagnostic

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Using AMS Device Manager 1. Right click on the device and select Service Tools. 2. In the left navigation window select Simulate. 3. In the group box labeled Device Variables choose the variable to simulate. Sensor 1 Temperature …

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  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 Note The thermocouple resistance algorithm does not calculate resistance values while the active calibrator mode is enabled. Configure T/C Diagnostic with a Field Communicator From the HOME screen, enter the Fast Key sequence 2, 2, 4, 3, 4 Device Dashboard Fast Keys Configure T/C Diagnostic with AMS Device Manager…

• Page 48: 4Min/Max Tracking Diagnostic

  Minimum and Maximum Temperature Tracking (Min/Max Tracking) when enabled records minimum and maximum temperatures with date and time stamps on Rosemount 644 HART Head mount Temperature Transmitters. This feature records values for Sensor 1, Sensor 2, Differential, Average, First Good and Terminal temperatures.

• Page 49: Establishing Multidrop Communication

  E. Computer or DCS F. HART Interface G. 4-20 mA H. Rosemount 644 HART Transmitter Note Rosemount 644 Transmitters are set to address 0 at the factory, allowing them to operate in the standard point-to-point manner with a 4–20 mA output signal. To activate multidrop communication, the transmitter address must be changed to a number between 1 and 15.

• Page 50: 1Changing A Transmitter Address

  Configuration Reference Manual 00809-0100-4728, Rev MB July 2016 2.12.1 Changing a transmitter address To activate multidrop communication, the transmitter poll address must be assigned a number from 1 to 15 for HART Revision 5, and 1-63 for HART Revision 7. Each transmitter in a multidropped loop must have a unique poll address.

• Page 51: 1Set The Transmitter To Burst Mode

  Reference Manual Configuration 00809-0100-4728, Rev MB July 2016 2.13.1 Set the transmitter to Burst Mode To set the transmitter to burst mode, follow the steps below with the Fast Key sequence: Using a Field Communicator HART 5 HART 7 From the HOME screen, enter the Fast Key sequence 2, 2, 8, 4 2, 2, 8, 5 Device Dashboard Fast Keys…

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  Configuration Reference Manual 00809-0100-4728, Rev MB July 2016 1. Configure the dual-sensor Rosemount 644 variable map as shown. Variable Mapping Sensor 1 or Sensor Average Sensor 2 Differential Temperature As Desired 2. Configure Channel 1 of the HART Tri-Loop as TV (differential temperature). If either sensor should fail, the differential temperature output will be +9999 or –9999 (high or low saturation), depending on the position of the Failure Mode Switch (see “Alarm Switch (HART)”…

• Page 53: Overview

  Reference Manual Hardware Installation 00809-0100-4728, Rev MB July 2016 Section 3 Hardware Installation Overview …………… . page 43 Safety messages .

• Page 54: Considerations

  Hardware Installation Reference Manual 00809-0100-4728, Rev MB July 2016 Failure to follow these installation guidelines could result in death or serious injury. Make sure only qualified personnel perform the installation.  Explosions could result in death or serious injury. Do not remove the connection head cover in explosive atmospheres when the circuit is live. …

• Page 55: Installation Procedures

  Reference Manual Hardware Installation 00809-0100-4728, Rev MB July 2016 Installation procedures Figure 3-1. Installation Flowchart Bench START Calibration? HERE FIELD INSTALL Set Failure Mode Switch BASIC SETUP Set Sensor Type Mount Transmitter Wire Transmitter Set Number of Wires Set Units Power Transmitter Set Range Values FINISHED…

• Page 56: Mount The Transmitter

  Hardware Installation Reference Manual 00809-0100-4728, Rev MB July 2016 Figure 3-2. Failure Switch Location Note If using an LCD display or Local Operator Interface, first remove the display by detaching it from the top of the Rosemount 644 device, set the switch to the desired position and reattach the display. See Figure 3-3.

• Page 57: Install The Device

  Reference Manual Hardware Installation 00809-0100-4728, Rev MB July 2016 Mounting a Rosemount 644 to a DIN Rail To attach a head mount transmitter to a DIN rail, assemble the appropriate rail mounting kit (part number 00644-5301-0010) to the transmitter as shown in Figure 3-4.

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  Reference Manual Hardware Installation 00809-0100-4728, Rev MB July 2016 8. Connect the shielded power cable leads to the transmitter power terminals. Avoid contact with sensor leads and sensor connections. Connect and tighten the cable gland. 9. Install and tighten the connection head cover. Enclosure covers must be fully engaged to meet explosion-proof requirements.
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  Reference Manual Hardware Installation 00809-0100-4728, Rev MB July 2016 A. Rosemount 644 Transmitter D. Extension B. Universal junction box E. Threaded thermowell C. Threaded style sensor Rail mount transmitter and sensor 1. Attach the transmitter to a suitable rail or panel. 2.
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  Reference Manual Hardware Installation 00809-0100-4728, Rev MB July 2016 Rail mount transmitter with threaded sensor 1. Attach the transmitter to a suitable rail or panel. 2. Attach the thermowell to the pipe or process container wall. Install and tighten the thermowell before applying pressure.

• Page 61: Multichannel Installations

  Reference Manual Hardware Installation 00809-0100-4728, Rev MB July 2016 3.4.4 Multichannel installations In a HART installation, several transmitters can be connected to a single master power supply, as shown Figure 3-5. In this case, the system may be grounded only at the negative power supply terminal. In multichannel installations where several transmitters depend on one power supply and the loss of all transmitters would cause operational problems, consider an uninterrupted power supply or a back-up battery.

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  Hardware Installation Reference Manual 00809-0100-4728, Rev MB July 2016 Use the following procedure to install the meter. 1. If the transmitter is installed in a loop, secure the loop and disconnect the power. If the transmitter is installed in an enclosure, remove the cover from the enclosure. 2.

• Page 63: Overview

  Reference Manual Electrical Installation 00809-0100-4728, Rev MB July 2016 Section 4 Electrical Installation Overview …………… . page 53 Safety messages .

• Page 64: Sensor Connections

  *The transmitter must be configured for at least a 3-wire RTD in order to recognize an RTD with a compensation loop. ™ ** Emerson Process Management provides a 4-wire sensors for all single element RTDs. Use these RTDs in 3-wire configurations by leaving the unneeded leads disconnected and insulated with electrical tape.

• Page 65: Power The Transmitter

  Reference Manual Electrical Installation 00809-0100-4728, Rev MB July 2016 Thermocouple or millivolt inputs The thermocouple can be connected directly to the transmitter. Use appropriate thermocouple extension wire if mounting the transmitter remotely from the sensor. Make millivolt inputs connections with copper wire. Use shielding for long runs of wire. RTD or ohm inputs The transmitters will accept a variety of RTD configurations, including 2-, 3- or 4-wire.

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  Electrical Installation Reference Manual 00809-0100-4728, Rev MB July 2016 6. Apply power (12 – 42 Vdc). Rosemount 644 (DIN A Head Mount) HART device shown with captivated screw terminals 60 (2.4) Sensor Terminals 33 (1.3) Communication Terminals 59 (2.3) Display 24 (.96) Connection Failure…

• Page 67: Ground The Transmitter

  If the technique does not eliminate the transmitter alarms, try another technique. If all of the techniques do not eliminate or prevent the transmitter alarms because of high EMI, contact an Emerson Process Management representative.

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  Electrical Installation Reference Manual 00809-0100-4728, Rev MB July 2016 Ungrounded thermocouple, mV, and RTD/ohm inputs Each process installation has different requirements for grounding. Use the grounding options recommended by the facility for the specific sensor type, or begin with grounding Option 1: (the most common).
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  Reference Manual Electrical Installation 00809-0100-4728, Rev MB July 2016 Option 3 1. Ground sensor wiring shield at the sensor, if possible. 2. Ensure that the sensor wiring and signal wiring shields are electrically isolated from the transmitter housing. 3. Do not connect the signal wiring shield to the sensor wiring shield. 4.

• Page 70: Wiring With A Rosemount 333 Hart Tri-Loop

  Electrical Installation Reference Manual 00809-0100-4728, Rev MB July 2016 ™ 4.3.4 Wiring with a Rosemount 333 HART Tri-Loop (HART / 4–20 mA only) Use the dual-sensor option Rosemount 644 Transmitter that is operating with two sensors in conjunction with a Rosemount 333 HART Tri-Loop HART-to-Analog Signal Converter to acquire an independent 4–20 mA analog output signal for each sensor input.

• Page 71: Overview

  Reference Manual Operation and Maintenance 00809-0100-4728, Rev MB July 2016 Section 5 Operation and Maintenance Overview …………… . page 61 Safety messages .

• Page 72: Calibration Overview

  Reference Manual Operation and Maintenance 00809-0100-4728, Rev MB July 2016 Calibration overview Calibrating the transmitter increases the measurement precision by allowing corrections to be made to the factory-stored characterization curve by digitally altering the transmitter’s interpretation of the sensor input. To understand calibration, it is necessary to understand that smart transmitters operate differently from analog transmitters.

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  Reference Manual Operation and Maintenance 00809-0100-4728, Rev MB July 2016 Figure 5-1. Trim Application: Linear Offset Application: Linear Offset and Slope Correction Solution: Single-Point Trim Solution: Two-Point Trim Method: Method: 1. Connect sensor to transmitter. Place sensor in bath 1. Connect sensor to transmitter. Place sensor in bath at low range point.

• Page 74: Recall Factory Trim-Sensor Trim

  Operation and Maintenance Reference Manual 00809-0100-4728, Rev MB July 2016 Using the Local Operator Interface Reference the below image for guidance on where to find Sensor Calibration in the LOI menu. Figure 5-2. Trimming the Sensor with the LOI CALIBRAT CALIBRAT SENSOR 1 CALIB SENSOR 1 CALIB…

• Page 75: Active Calibrator And Emf Compensation

  Reference Manual Operation and Maintenance 00809-0100-4728, Rev MB July 2016 5.4.2 Active calibrator and EMF compensation The transmitter operates with a pulsating sensor current to allow EMF compensation and detection of open sensor conditions. Because some calibration equipment requires a steady sensor current to function properly, the Active Calibrator Mode feature should be used when an active calibrator is connected.

• Page 76: Scaled Output Trim

  Operation and Maintenance Reference Manual 00809-0100-4728, Rev MB July 2016 Using Field Communicator 1. Connect an accurate reference meter to the transmitter at the CONNECT REFERENCE METER prompt by shunting the power to the transmitter through the reference meter at some point in the loop. From the HOME screen, enter the Fast Key sequence 3, 4, 5, 1 Device Dashboard Fast Keys…

• Page 77: Transmitter-Sensor Matching

  Transmitter-Sensor Matching Use Transmitter-Sensor Matching to enhance the temperature measurement accuracy of the system and if you have a sensor with Callendar-Van Dusen constants. When ordered from Emerson Process Management, sensors with Callendar-Van Dusen constants are NIST-traceable. The Rosemount 644 accepts Callendar-Van Dusen constants from a calibrated RTD schedule and generates a special custom curve to match that specific sensor Resistance vs.

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  Operation and Maintenance Reference Manual 00809-0100-4728, Rev MB July 2016 Table 5-2. Standard RTD vs. RTD with Matched CVD Constants with Enhanced Transmitter Accuracy Option P8 System accuracy comparison at 150 °C using a PT 100 (=0.00385) RTD with a span of 0 to 200 °C Standard RTD Matched RTD Rosemount 644…

• Page 79: Switching Hart Revision

  Reference Manual Operation and Maintenance 00809-0100-4728, Rev MB July 2016 Switching HART Revision Some systems are not capable of communicating with HART Revision 7 devices. The following procedures list how to change HART revisions between HART Revision 7 and HART Revision 5. 5.7.1 Using the Generic Menu If the HART configuration tool is not capable of communicating with a HART Revision 7 device, it should…

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  Reference Manual Operation and Maintenance 00809-0100-4728, Rev MB July 2016 Operation and Maintenance…

• Page 81: Overview

  Reference Manual Troubleshooting 00809-0100-4728, Rev MB July 2016 Section 6 Troubleshooting Overview …………… . page 71 Safety messages .

• Page 82: Troubleshooting The 4-20 Ma/Hart Output

  Check the revision level of the transmitter device descriptors (DDs) stored in your communicator. The communicator should report Dev v4, DD v1 (improved), or reference “Field Communicator” on page 3-2 for previous versions. Contact ™ Emerson Process Management Customer Central for assistance. Transmitter •…

• Page 83: Diagnostic Messages

  DEVICE 2. If condition persists, replace the transmitter. Contact have failed. For example, the transmitter may have experienced the nearest Emerson Process Management Field an electronics failure while Service Center if necessary. attempting to store information. If diagnostics indicate an…

• Page 84: Diagnostic Messages: Warning

  Troubleshooting Reference Manual 00809-0100-4728, Rev MB July 2016 6.4.2 Diagnostic messages: Warning display Alert name screen screen Problem Recommended action 1. Replace Sensor 1 at you earliest convenience. ™ Hot Backup HOT BU HOT BU Sensor 1 has failed (open or Active shorted) and Sensor 2 is SNSR 1…

• Page 85: Other Lcd Display Messages

  Reference Manual Troubleshooting 00809-0100-4728, Rev MB July 2016 6.4.3 Other LCD display messages display Alert name screen LOI screen Problem Recommended action LCD is not The display may not be If the meter does not appear to function, make sure Rosemount Rosemount displaying…

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  Reference Manual Troubleshooting 00809-0100-4728, Rev MB July 2016 Troubleshooting…

• Page 87: Safety Instrumented Systems (Sis) Certification

  Systems up to SIL 3. Rosemount 644 safety certified identification All Rosemount 644 HART Head Mount Transmitters must be identified as safety certified before installing into SIS systems. To identify a safety certified Rosemount 644, make sure the device satisfies number 1 below and at least one of the options in 2, 3, or 4.

• Page 88: Installation

  Safety Instrumented Systems (SIS) Certification Reference Manual 00809-0100-4728, Rev MB July 2016 4. Identify a certified Rosemount 644 by its Device Revision (found using any HART-compliant communicator). For the Rosemount 644, certified device revisions are as follows: – Device Revision 8.x (HART 5) –…

• Page 89: Alarm And Saturation Levels

  Reference Manual Safety Instrumented Systems (SIS) Certification 00809-0100-4728, Rev MB July 2016 Alarm and saturation levels The Rosemount 644 features software driven alarm diagnostics. The independent circuit is designed to provide backup alarm output if the microprocessor software fails. The transmitter will go to a high or low output current for internally detected failures.

• Page 90: Rosemount 644 Sis Operation And Maintenance

  Reference Manual Safety Instrumented Systems (SIS) Certification 00809-0100-4728, Rev MB July 2016 Rosemount 644 SIS operation and maintenance 7.7.1 Proof test The following proof tests are recommended. In the event that an error is found in the safety functionality, proof test results and corrective actions taken must be documented at www.EmersonPro- cess.com/Rosemount/Safety.

• Page 91: Specifications

  Reference Manual Safety Instrumented Systems (SIS) Certification 00809-0100-4728, Rev MB July 2016 5. Restore the loop to full operation. Remove the bypass from the safety PLC or otherwise restore normal operation. 6. Document the test results per the plant’s requirements. Table 7-1.

• Page 92: Product Life

  Reference Manual Safety Instrumented Systems (SIS) Certification 00809-0100-4728, Rev MB July 2016 7.8.3 Product life 50 years — based on worst case component wear-out mechanisms — not based on wear-out of process sensors. Report any safety related product information at: http://rosemount.d1asia.ph/rosemount/safety/Repor- tAFailure_newweb.asp Safety Instrumented Systems (SIS) Certification…

• Page 93: Specifications

  Configuration …………..page 96 Specifications and Reference Data for Rosemount 644 HART Head Mount ….page 97 A.1 Specifications…

• Page 94: Performance

  Surface finish is polished to 32 RMA. Laser etched product marking reference elements. on housing and standard covers. Vibration effect The Rosemount 644 HART is tested to the following specifications with no effect on performance per IEC 60770-1, 2010: Frequency Vibration 10 to 60 Hz 0.35 mm displacement…

• Page 95: Conformance To Specifications

  Transmitter power terminals are rated to 42.4 Vdc. A Field Communicator requires a loop resistance between 250 – Rosemount 644 Sensor Connection Diagram: 1100 ohms. The Rosemount 644 HART device does not Rosemount 644 Rail mount communicate when power is below 12 Vdc at the transmitter terminals.

• Page 96: Temperature Limits

  Reference Manual Specifications and Reference Data July 2016 00809-0100-4728, Rev MB A.2.3 Temperature limits Table A-1. Available Alarm Range Operating limit Storage limit NAMUR- NE 43 –4 to 185 °F –50 to 185 °F Standard With LCD Display Compliant –20 to 85 °C –45 to 85 °C –40 to 185 °F –58 to 248 °F…

• Page 97
  Specifications and Reference Data Reference Manual July 2016 00809-0100-4728, Rev MB Table A-2. Rosemount 644 Input Options and Accuracy Sensor Sensor Input Recommended Digital options reference ranges Min. Span accuracy accuracy NIST Monograph Type J –180 to 760 –292 to 1400 ±…

• Page 98: Dimensional Drawings

  Reference Manual Specifications and Reference Data July 2016 00809-0100-4728, Rev MB A.3 Dimensional drawings Figure A-2. Rosemount 644 (DIN A Head Mount) HART device shown with captivated screw terminals 60 (2.4) Sensor Terminals 33 (1.3) Communication Terminals 31 (1.2) 59 (2.3) Display 24 (.96) Connection…

• Page 99: Lcd Display Cover

  Specifications and Reference Data Reference Manual July 2016 00809-0100-4728, Rev MB Figure A-5. Mounting Kits for Rosemount 644 Head Mount Rosemount 644H rail clips Rosemount 644R rail and wall clips G-Rail (asymmetric) Top hat rail (symmetric) G-Rail Mounting Mounting Grooves Hardware Hardware Screw Holes…

• Page 100: Stainless Steel Housing For Biotechnology, Pharmaceutical Industries, And Sanitary Applications

  Reference Manual Specifications and Reference Data July 2016 00809-0100-4728, Rev MB A.3.2 Stainless steel housing for biotechnology, pharmaceutical industries, and sanitary applications Figure A-8. Sanitary Housing (Option Codes S1, S2, S3, S4) Standard cover LCD display cover Housing Standard Cover LCD Display Cover Housing O-Ring…

• Page 101: Ordering Information

  Specifications and Reference Data Reference Manual July 2016 00809-0100-4728, Rev MB A.4 Ordering information The Rosemount 644 is a versatile temperature transmitter that delivers field reliability and advanced accuracy and stability to meet demanding process needs. Transmitter features include: HART/4-20 mA with Selectable Revision 5 and 7 selectable (Option …

• Page 102
  Reference Manual Specifications and Reference Data July 2016 00809-0100-4728, Rev MB Table A-3. Rosemount 644 Temperature Transmitter Ordering Information H The Standard offering represents the most common models and options. These options should be selected for best delivery. The Expanded offering is manufactured after receipt of order and is subject to additional delivery lead time. l = Available –…
• Page 103
  Specifications and Reference Data Reference Manual July 2016 00809-0100-4728, Rev MB Table A-3. Rosemount 644 Temperature Transmitter Ordering Information H The Standard offering represents the most common models and options. These options should be selected for best delivery. The Expanded offering is manufactured after receipt of order and is subject to additional delivery lead time. l = Available –…
• Page 104
  Reference Manual Specifications and Reference Data July 2016 00809-0100-4728, Rev MB Table A-3. Rosemount 644 Temperature Transmitter Ordering Information H The Standard offering represents the most common models and options. These options should be selected for best delivery. The Expanded offering is manufactured after receipt of order and is subject to additional delivery lead time. l = Available –…
• Page 105
  Specifications and Reference Data Reference Manual July 2016 00809-0100-4728, Rev MB Note For additional options (e.g. “K” codes), contact your local Emerson Process Management representative. Table A-4. Transmitter Accessories Part number Part description Aluminum alloy Universal Head, standard cover—M20 entries 00644-4420-0002 Aluminum alloy Universal Head, meter cover—M20 entries…

• Page 106: Configuration

  Reference Manual Specifications and Reference Data July 2016 00809-0100-4728, Rev MB A.5 Configuration A.5.4 Considerations Special mounting considerations A.5.1 Transmitter configuration Figure A-5 on page 89 for the special hardware that is available The transmitter is available with standard configuration settings for HART.

• Page 107: Specifications And Reference Data For Rosemount 644 Hart Head Mount

  Refer to the Rosemount 644 Quick Start Guide or Reference Manual for more instructions. A.6 Specifications and Reference Data Local display for Rosemount 644 HART Head The optional five-digit integral LCD Display includes a floating or fixed decimal point. It can also display engineering units (°F, °C, °R, Mount K, W, and mV), mA, and percent of span.

• Page 108: Physical Specifications

  Reference Manual Specifications and Reference Data July 2016 00809-0100-4728, Rev MB A.6.2 Physical specifications Weight Code Options Weight Electrical connections 644H HART, Head Mount Transmitter 95 g (3.39 oz) Model Power and sensor terminals Fieldbus, OUNDATION 644H 92 g (3.25 oz) Rosemount Compression screws permanently fixed to terminal Head Mount Transmitter…

• Page 109: 4-20 Ma / Hart Specifications

  Temperature limits Operating limit Storage limit * Emerson Process Management provides 4-wire sensors for all single element RTDs. You can use these RTDs in 3-wire configurations by leaving the –40 to 185 °F –50 to 185 °F unneeded leads disconnected and insulated with electrical tape.

• Page 110
  Reference Manual Specifications and Reference Data July 2016 00809-0100-4728, Rev MB Standard NAMUR- NE 43 compliant Linear 3.9  I  20.5 3.8  I  20.5 Output: 21.75  I  23 21.5  I  23 Fail High: 3.5 …

• Page 111: Bappendix B: Product Certifications

  Emerson Process Management Asia Pacific Limited – Singapore Markings: (with enclosure): IS CL I,II,III, GP ABCDEFG T4 Emerson Process Management GmbH & Co. — Karlstein, Germany IS CL I Zone 0, AEX ia IIC; T4 NI CL I, DIV.2, GP ABCD Emerson Process Management (India) Private Ltd.

• Page 112
  Reference Manual Product Certifications July 2016 00809-0100-4728, Rev MB Markings: (with enclosure): Table B-1. Input Parameters Ex ia Ci = 3.3 nF CLASS I, GRPS A,B,C,D, T4/T6, CLASS I, ZONE 0, IIC Li = 0 WHEN INSTALL PER DRAWING 00644-1064 or 0644-2072 Sensor SUITABLE CLASS I DIV 2, WITH NON-INCENDIVE…

• Page 113: Other Certifications

  Product Certifications Reference Manual July 2016 00809-0100-4728, Rev MB ND ATEX Dust Special Conditions for Safe Use (X): None Certification: KEMA 99ATEX8715X Combinations of certifications Standards: EN 61241-0:2006, EN 61241-1:2004 Stainless steel certification tag is provided when optional approval Markings: II 1 D, Ex tD A20 IP66 T95°C is specified.

• Page 114: European Certifications

  Reference Manual Product Certifications July 2016 00809-0100-4728, Rev MB FM Explosion Proof Table B-2. Entity Parameters Explosion Proof for Class I, Division 1, Groups B, C, and D. I.S. Loop/power terminals Nonincendive for use in Class 1, Division 2, Groups A, B, C, and = 30 V Temperature Code: T5 (T = –…

• Page 115: Iecex Certifications

  Product Certifications Reference Manual July 2016 00809-0100-4728, Rev MB Specific Condition for Safe Use (X): Table B-6. Electrical Data 1. For information on the dimensions of the flameproof joints Transmitter Sensor the manufacturer shall be contacted. Thermocouple B.3.4 IECEx Certifications = 32 V = 5 V IECEx Flameproof and Dust…

• Page 116: Russian Gost Certifications

  Reference Manual Product Certifications July 2016 00809-0100-4728, Rev MB B.3.7 Russian GOST Certifications PPC BA-13006: 0 Ex ia IIC T4/T5/T6 B.3.8 Kazakhstan GOST Pattern approval Certificate for Measuring Instruments See Certificate B.3.9 Ukraine GOST Pattern Approval for Measuring Instruments See Certificate Product Certifications…

• Page 117
  Product Certifications Reference Manual July 2016 00809-0100-4728, Rev MB Figure B-1. CSA Intrinsic Safety Installation Drawing 00644-1064, Rev. AB Product Certifications…
• Page 118
  Reference Manual Product Certifications July 2016 00809-0100-4728, Rev MB Figure B-2. CSA Explosion-Proof Installation Drawing 00644-1059, Rev. AH Product Certifications…
• Page 119
  Product Certifications Reference Manual July 2016 00809-0100-4728, Rev MB Figure B-3. FM Intrinsic Safety Installation Drawing 00644-0009, Rev. AE Sheet 1 of 2 Product Certifications…
• Page 120
  Reference Manual Product Certifications July 2016 00809-0100-4728, Rev MB Sheet 2 of 2 Product Certifications…
• Page 121
  Product Certifications Reference Manual July 2016 00809-0100-4728, Rev MB Figure B-4. FM Explosion-Proof Installation Drawing 00644-1049, Rev. AE Product Certifications…
• Page 122
  Reference Manual Product Certifications July 2016 00809-0100-4728, Rev MB Product Certifications…

• Page 123: Cappendix C: Field Communicator Menu Trees And Fast Keys

  Field Communicator Menu Trees and Fast Keys Reference Manual July 2016 00809-0100-4728, Rev MB Appendix C Field Communicator Menu Trees and Fast Keys Field Communicator menu trees Figure C-1. HART Revision 5 Field Communicator Menu Tree — Overview Good (only if No Alerts) Active Alerts 1 No Active Alerts 1 Good (only if No Alerts)

• Page 124
  Reference Manual Field Communicator Menu Trees and Fast Keys July 2016 00809-0100-4728, Rev MB Figure C-2. HART Revision 5 Field Communicator Menu Tree — Configure Home Guided Setup Sensor 1 1 Overview 1 Configure Sensors 1 Sensor 1 Temp 2 Configure Configure 2 Calibrate Sensors 2 Sensor 1 Type…
• Page 125
  Field Communicator Menu Trees and Fast Keys Reference Manual July 2016 00809-0100-4728, Rev MB Figure C-3. HART Revision 5 Field Communicator Menu Tree – Service Tools Good (only if No Alerts) 1 No Active Alerts Failed 1 Invalid Configuration 2 Electronics Failure 3 Calibration Error 4 Sensor Drift Alert Active 5 Sensor 1 Open…
• Page 126
  Reference Manual Field Communicator Menu Trees and Fast Keys July 2016 00809-0100-4728, Rev MB Figure C-4. HART Revision 7 Field Communicator Menu Tree – Overview Good (only if No Alerts) Active Alerts 1 No Active Alerts 1 Good (only if No Alerts) 2 Failed Failed 3 Advisory…
• Page 127
  Field Communicator Menu Trees and Fast Keys Reference Manual July 2016 00809-0100-4728, Rev MB Figure C-5. HART Revision 7 Field Communicator Menu Tree — Configure Home Sensor 1 Guided Setup 1 Overview 1 Sensor 1 Temp 1 Configure Sensors 2 Configure Configure 2 Sensor 1 Status* 2 Calibrate Sensors…
• Page 128
  Reference Manual Field Communicator Menu Trees and Fast Keys July 2016 00809-0100-4728, Rev MB Figure C-6. HART Revision 7 Field Communicator Menu Tree – Service Tools Good (only if No Alerts) 1 No Active Alerts Failed 1 Invalid Configuration 2 Electronics Failure 3 Calibration Error 4 Sensor Drift Alert Active 5 Sensor 1 Open…

• Page 129: Field Communicator Fast Keys

  Field Communicator Menu Trees and Fast Keys Reference Manual July 2016 00809-0100-4728, Rev MB Field Communicator Fast Keys Table C-1. Device Revision 8 and 9 (HART 5 and 7) Field Communicator Device Dashboard Fast Key Sequences Function HART 5 HART 7 Alarm Values 2, 2, 5, 6 2, 2, 5, 6…

• Page 130
  Reference Manual Field Communicator Menu Trees and Fast Keys July 2016 00809-0100-4728, Rev MB Table C-1. Device Revision 8 and 9 (HART 5 and 7) Field Communicator Device Dashboard Fast Key Sequences Function HART 5 HART 7 Software Revision 1, 8, 2, 4 1, 8, 2, 4 2, 2, 7, 1, 1 2, 2, 7, 1, 1…

• Page 131: Number Entry

  Local Operator Interface (LOI) Reference Manual July 2016 00809-0100-4728, Rev MB Appendix D Local Operator Interface (LOI) Number entry Floating point numbers can be entered with the LOI. All eight number locations on the top line can be used for number entry. Refer to Table 2-2 on page 13 for LOI button operation.

• Page 132: Text Entry

  Local Operator Interface (LOI) Reference Manual July 2016 00809-0100-4728, Rev MB Usage notes: It is possible to move backwards in the number by scrolling to the left and pressing enter. The  left arrow appears as such in the LOI: The negative symbol is only allowed in the left most position.

• Page 133: Timeout

  Local Operator Interface (LOI) Reference Manual July 2016 00809-0100-4728, Rev MB Scrolling backwards Moving backwards during digit or text entry was described above in Digit Entry “Usage Notes”. During regular menu navigation it is possible to go back to the previous screen by pressing both buttons at the same time.

• Page 134
  Local Operator Interface (LOI) Reference Manual July 2016 00809-0100-4728, Rev MB Saving a setting D E G C D E G C S A v e ? S A v e D Saving text or values 005.0000 005.0000 S A v e ? S A v e D D.4.2 Canceling…
• Page 135
  Local Operator Interface (LOI) Reference Manual July 2016 00809-0100-4728, Rev MB LOI menu tree VIEW CONFIG UNITS SENSOR 1 TYPE CONNECTION SENSOR 2 TYPE CONNECTION UPPER RANGE VALUE LOWER RANGE VALUE DAMPING VALUE HIGH ALARM LOW ALARM HIGH SATURATION LOW SATURATION BACK TO MENU EXIT MENU LOI MENU…
• Page 136
  Local Operator Interface (LOI) Reference Manual July 2016 00809-0100-4728, Rev MB LOI menu tree – extended menu CALIBRAT SENSOR 1 CALIB SENSOR 2 CALIB ANALOG TRIM FACTORY RECALL BACK TO MENU EXIT MENU DAMPING PV DAMP SENSOR 1 DAMP SENSOR 2 DAMP DIFFRNTL DAMP AVERAGE DAMP 1ST GOOD DAMP…
• Page 137
  Reference Manual Index 00809-0100-4728, Rev MB July 2016 Index ……..
• Page 138
  Reference Manual Index 00809-0100-4728, Rev MB July 2016 Index…
• Page 140
  Standard Terms and Conditions of Sale can be found at: Middle East and Africa Regional Office www.Emerson.com/en-us/pages/Terms-of-Use.aspx The Emerson logo is a trademark and service mark of Emerson Electric Co. Emerson Process Management AMS, DeltaV, Hot Backup, Tri-Loop, PlantWeb, Rosemount, and Rosemount logotype are trademarks of Emerson Process Management.

• Page 1
  Reference Manual 00809-0500-4728, Rev AC December 2021 ™ Rosemount 644 Rail Mount Temperature Transmitter ® with RK Option and HART 7 Protocol…
• Page 2
  Using non-nuclear qualified products in applications that require nuclear-qualified hardware or products may cause inaccurate readings. For information on Rosemount nuclear-qualified products, contact your local Emerson Sales Representative. Physical access Unauthorized personnel may potentially cause significant damage to and/or misconfiguration of end users’ equipment. This could be intentional or unintentional and needs to be protected against.

• Page 3: Table Of Contents

  5.10 Electronic temperature out of limits………………19 5.11 Power supply voltage issues…………………19 5.12 Attempting or failed to enter SIL mode………………19 5.13 Electronics failure……………………19 5.14 Electronics failure……………………20 5.15 Power supply voltage issues…………………20 5.16 Loop current read back error………………..20 5.17 Power supply voltage issues…………………20 Emerson.com/Rosemount…

• Page 4
  Contents Reference Manual December 2021 00809-0500-4728 5.18 Electronics failure……………………20 5.19 Electronics failure……………………21 5.20 Electronics failure……………………21 5.21 Electronics failure……………………21 5.22 Watchdog reset executed………………….21 5.23 Internal RTD sensor error………………….22 5.24 Sensor failure………………………22 5.25 Sensor measurement error…………………. 22 5.26 Sensor measurement error………………….

• Page 5: Chapter 1 Introduction

  Rosemount Volume 1 Temperature Sensors and Accessories (English) Product Data Sheet • Rosemount DIN-Style Temperature Sensors and Thermowells (Metric) Product Data Sheet Table 1-1: Change Summary: Rosemount 644 Rail Mount HART Device Revision Release date NAMUR NAMUR HART software Manual document software…

• Page 6: Mounting, Installation, And Programming

  Introduction Reference Manual December 2021 00809-0500-4728 Mounting, installation, and programming • DIN rail mounting with up to 84 inputs per meter ® • Communication via Asset Management tool (e.g. Pactware, AMS, HART communicator) for which all relevant DD, eDD and DTM files are available Product recycling/disposal Recycling of equipment and packaging should be taken into consideration and disposed of in accordance with local and national legislation/regulations.

• Page 7: Chapter 2 Installation

  Process leaks could result in death or serious injury. Do not remove the thermowell while in operation. Install and tighten thermowells and sensors before applying pressure. Electrical shock could cause death or serious injury. Use extreme caution when making contact with the leads and terminals. Emerson.com/Rosemount…

• Page 8: Connections

  Installation Reference Manual December 2021 00809-0500-4728 Connections Single input 2 w / 3 w / 4 w RTD or TC (internal CJC or 3 w / 4 w lin. R external 2 w / 3 w / 4 w potentiometer CJC) 41 42 41 42…

• Page 9: Multidrop Mode

  (with a fixed output signal of 4 mA). Maximum current in the loop is therefore 252 mA. A. Power supply B. Connection C. Connection D. Connection E. 250 Ω < R < 1100 Ω load F. Transmitter Emerson.com/Rosemount…

• Page 10
  Installation Reference Manual December 2021 00809-0500-4728 Rosemount 644R…

• Page 11: Chapter 3 Configuration

  Emerson’s DDL driver ™ • Via programming framework (e.g. DCS, PACTware HART communicator To get access to product-specific commands, the HART communicator must be loaded with Emerson’s DDL driver. This can be ordered through either the FieldComm Group or Emerson. Emerson.com/Rosemount…

• Page 12
  Configuration Reference Manual December 2021 00809-0500-4728 A. Rosemount transmitter B. Ex area C. Safe area D. 250 Ω < R < 1100 Ω load E. Receiving equipment F. +V supply G. Input Programming framework ® ™ Support for both EDD and FDT /DTM technology, offering configuration and monitoring via relevant DCS/Asset Management Systems and supported management packages (e.g.

• Page 13: Operation And Maintenance

  Onboard LED indicates faults according to NAMUR NE44 and NE107. Condition LED status Device OK Constant green No supply Fault indication independent of the device (e.g. wire break, Flashing red sensor short circuit, violation of input or output limits) Device error Constant red Emerson.com/Rosemount…

• Page 14: Jumpers

  Operation and Maintenance Reference Manual December 2021 00809-0500-4728 Jumpers The Rosemount Single and Dual Input 644R/T Transmitters have two front jumpers: one to enable Write Protection and one to select the output current at Safe State to go above 21 mA as specified in NAMUR NE43.

• Page 15
  +70…+85 °C transmitter -30…-10 °C +30…+50 °C >85 °C electronics Runtime Recording of Sensor measurement values during operation, logging time spent in meter — each of nine fixed sub Sensor ranges. Sensors Subranges are defined individually for each Sensor type. Emerson.com/Rosemount…
• Page 16
  Operation and Maintenance Reference Manual December 2021 00809-0500-4728 Table 4-1: Advanced functions (continued) Function Description Slave pointer — Recording of minimum/maximum internal transmitter temperature for device’s transmitter complete lifetime. electronics Slave pointer — Recording of minimum/maximum values for Sensor/s measurements is saved. Sensors Values are reset when measurement configuration is changed.

• Page 17: Chapter 5 Troubleshooting

  (LL) as configured, and is no longer corresponding to the PV value. Recommended action Reconnect or repair sensor. Primary sensor 1 error LED status: flashing red A sensor error (broken/shorted sensor) is detected on Sensor 1. Recommended action Reconnect or repair sensor. Emerson.com/Rosemount…

• Page 18: Primary Sensor 2 Error (Only If Sensor 2 Is Enabled)

  Troubleshooting Reference Manual December 2021 00809-0500-4728 Primary sensor 2 error (only if sensor 2 is enabled) LED status: flashing red A sensor error (broken/shorted sensor) is detected on Sensor 2. This is only possible if Sensor type 2 is <> ʺNoneʺ. Recommended action Reconnect or repair sensor.

• Page 19: Electronic Temperature Out Of Limits

  LED status: solid red An unrecoverable error occurred in the internal communication to the input CPU. Recommended action 1. Reset or re-power the device. 2. If the error is persistent send the device for evaluation or replace the device. Emerson.com/Rosemount…

• Page 20: Electronics Failure

  Troubleshooting Reference Manual December 2021 00809-0500-4728 5.14 Electronics failure LED status: solid red An unrecoverable error occurred in the input CPU. Recommended action 1. Reset or re-power the device. 2. If the error is persistent send the device for evaluation or replace the device. 5.15 Power supply voltage issues LED status: solid red…

• Page 21: Electronics Failure

  2. If the error is persistent send the device for evaluation or replace the device. 5.22 Watchdog reset executed LED status: solid red The main program was reset unintentionally due to a failed code execution. Recommended action Correct and/or re-send the configuration. Emerson.com/Rosemount…

• Page 22: Internal Rtd Sensor Error

  Troubleshooting Reference Manual December 2021 00809-0500-4728 5.23 Internal RTD sensor error LED status: solid red Sensor error is detected on the internal temperature sensor. Recommended action Reset or re-power the device. 5.24 Sensor failure LED status: flashing red A critical measurement error is detected on internal voltage reference. Recommended action 1.

• Page 23
  Reference Manual Troubleshooting 00809-0500-4728 December 2021 Recommended actions 1. Reconnect or repair sensor. 2. If the error is persistent send the device for evaluation or replace the device. Emerson.com/Rosemount…
• Page 24
  Troubleshooting Reference Manual December 2021 00809-0500-4728 Rosemount 644R…

• Page 25: Appendix A Reference Data

  Reference Data 00809-0500-4728 December 2021 Reference Data Product certifications To view current Rosemount 644 Temperature Transmitter product certification, follow these steps: Procedure 1. Go to Emerson.com/Rosemount/Rosemount-644. 2. Scroll as needed to the green menu bar and click Documents & Drawings.

• Page 26: Dimensional Drawings

  Reference Data Reference Manual December 2021 00809-0500-4728 Dimensional drawings Single Sensor Input Figure A-1: Single Sensor Input Dimensions are in inches (millimeters). Dual Sensor Input Figure A-2: Dual Sensor Input Rosemount 644R…

• Page 27
  Reference Manual Reference Data 00809-0500-4728 December 2021 Dimensions are in inches (millimeters). Emerson.com/Rosemount…
• Page 28
  2022 Emerson. All rights reserved. Emerson Terms and Conditions of Sale are available upon request. The Emerson logo is a trademark and service mark of Emerson Electric Co. Rosemount is a mark of one of the Emerson family of companies. All other marks are the property…

Rosemount™ 644 Temperature

Transmitter

Read this manual before working with the product. For personal and system safety, and for optimum product performance, make sure to thoroughly understand the contents before installing, using, or maintaining this product.

The United States has two toll-free assistance numbers and one international number.

Customer Central

1-800-999-9307 (7:00 a.m. to 7:00 p.m. CST)

National Response Center

1-800-654-7768 (24 hours a day) Equipment service needs

International

1-(952)-906-8888

The products described in this document are NOT designed for nuclear-qualified applications.

Using non-nuclear qualified products in applications that require nuclear-qualified hardware or products may cause inaccurate readings.

For information on Rosemount nuclear-qualified products, contact a Emerson™ Sales Representative.

Failure to follow these installation guidelines could result in death or serious injury.

Make sure only qualified personnel perform the installation.

Explosions could result in death or serious injury.

Do not remove the connection head cover in explosive atmospheres when the circuit is live.

Before connecting HART in an explosive atmosphere, make sure the instruments in the loop are installed in accordance with intrinsically safe or non-incendive field wiring practices.

Verify the operating atmosphere of the transmitter is consistent with the appropriate hazardous locations certifications.

All connection head covers must be fully engaged to meet explosion-proof requirements.

Process leaks could result in death or serious injury.

Do not remove the thermowell while in operation.

Install and tighten thermowells and sensors before applying pressure.

Electrical shock could cause death or serious injury.

Use extreme caution when making contact with the leads and terminals.

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3 Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4 System readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4 Configuration methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5 Verify configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 9 Basic configuration of the transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 11 Configure dual sensor options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 15 Configure device outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 20 Inputting device information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 26 Configure measurement filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 27 Diagnostics and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 30 Establishing multi drop communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 34 Using the transmitter with the HART Tri-Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 35

2.1Overview

This section contains information on commissioning and tasks that should be performed on the bench prior to installation. Field Communicator, AMS Device Manager, and Local Operator Interface (LOI) instructions are given to perform configuration functions. For convenience, Field Communicator Fast Key sequences are labeled “Fast Keys,” and abbreviated LOI menus are provided for each function below. The LOI is only available on the Rosemount™ 644 Head Mount and Field Mount designs, and the configuration instructions referencing the interface will not apply to the Rail mount form factor.

Full Field Communicator menu trees and Fast Key sequences are available in Appendix B: Field Communicator Menu Trees and Fast Keys. Local operator interface menu trees are available in Appendix C: Local Operator Interface (LOI).

2.2Safety messages

Instructions and procedures in this section may require special precautions to ensure the safety of the personnel performing the operations. Information that potentially raises safety issues is indicated by a warning symbol (). Refer to the following safety messages before performing an operation preceded by this symbol.

Failure to follow these installation guidelines could result in death or serious injury.

Make sure only qualified personnel perform the installation.

Explosions could result in death or serious injury.

Do not remove the connection head cover in explosive atmospheres when the circuit is live.

Before connecting a Field Communicator in an explosive atmosphere, make sure the instruments in the loop are installed in accordance with intrinsically safe or non-incendive field wiring practices.

Verify the operating atmosphere of the transmitter is consistent with the appropriate hazardous locations certifications.

All connection head covers must be fully engaged to meet explosion-proof requirements.

Process leaks could result in death or serious injury.

Do not remove the thermowell while in operation.

Install and tighten thermowells and sensors before applying pressure.

Electrical shock could cause death or serious injury.

Use extreme caution when making contact with the leads and terminals.

2.3System readiness

Confirm HART® revision capability

If using HART based control or asset management systems, confirm the HART capability of those systems prior to transmitter installation. Not all systems are capable of communicating with HART Revision 7 protocol. This transmitter can be configured for either HART Revision 5 or 7.

For instructions on how to change the HART revision of your transmitter, see “System readiness” on page 4.

2.3.1Confirm correct device driver

Verify the latest Device Driver files are loaded on your systems to ensure proper communications.

Download the latest Device Driver at Emerson.com/Rosemount or Fieldcomm.org.

Table 2-1. Rosemount 644 Device Revisions and Files

1.NAMUR Software Revision is located on the hardware tag of the device. HART Software Revision can be read using a HART Communication tool.

2.Device Driver file names use Device and DD Revision, e.g. 10_01. HART Protocol is designed to enable legacy device driver revisions to continue to communicate with new HART devices. To access new functionality, the new Device Driver must be downloaded. It is recommended to download the new Device Driver files to ensure full functionality.

3.HART Revision 5 and 7 Selectable. Dual Sensor support, Safety Certified, Advanced Diagnostics (if ordered), Enhanced Accuracy and Stability (if ordered).

2.3.2Surges/transients

The transmitter will withstand electrical transients of the energy level encountered in static discharges or induced switching transients. However, high-energy transients, such as those induced in wiring from nearby lightning strikes, welding, heavy electrical equipment, or switching gears, can damage both the transmitter and the sensor. To protect against high-energy transients, install the transmitter into a suitable connection head with the integral transient protector, option T1. Refer to the Rosemount 644 Product Data Sheet for more information.

2.4Configuration methods

Set all transmitter hardware adjustments during commissioning to avoid exposing the transmitter electronics to the plant environment after installation.

The Rosemount 644 Transmitter can be configured either before or after installation. Configuring the transmitter on the bench using either a Field Communicator, AMS Device Manager, or LOI ensures all transmitter components are in working order prior to installation.

The Rosemount 644 Transmitter can be configured either on-line or off-line using a Field Communicator, AMS Device Manager or the optional LOI (Head mount and field mount). During on-line configuration, the transmitter is connected to a Field communicator. Data is entered in the working register of the communicator and sent directly to the transmitter.

Off-line configuration consists of storing configuration data in a Field Communicator while it is not connected to a transmitter. Data is stored in nonvolatile memory and can be downloaded to the transmitter at a later time.

2.4.1Configuring on the bench

To configure on the bench, required equipment includes a power supply, a digital multimeter (DMM), and Field Communicator, AMS Device Manager, or a LOI – option M4.

Connect the equipment as shown in Figure 2-1. Connect HART Communication leads at any termination point in the signal loop. To ensure successful HART Communication, a resistance of at least 250 Ohms must be present between the transmitter and the power supply. Connect the Field Communicator leads to the clips behind the power (+,–) terminals on the top of the device. Avoid exposing the transmitter electronics to the plant environment after installation by setting all transmitter jumpers during the commissioning stage on the bench.

Figure 2-1. Powering the Transmitter for Bench Configuration

250 Ω ≤ RL ≤ 1100 Ω

B B

A.Power supply

B.Field Communicator

Note

Signal loop may be grounded at any point or left ungrounded.

A Field Communicator may be connected at any termination point in the signal loop. The signal loop must have between 250 and 1100 Ohms load for communications.

Max torque is 6 in-lb (0.7 N-m).

2.4.2Selecting a configuration tool

Field Communicator

The Field Communicator is a hand-held device that exchanges information with the transmitter from the control room, the instrument site, or any wiring termination point in the loop. To facilitate communication, connect the Field Communicator, shown in this manual, in parallel with the transmitter (see Figure 2-1). Use the loop connection ports on the rear panel of the Field Communicator. The connections are non-polarized. Do not make connections to the serial port or the Ni-Cad recharger jack in explosive atmospheres. Before connecting the Field Communicator in an explosive atmosphere make sure the instruments in the loop are installed in accordance with intrinsically safe or non-incendive field wiring practices.

There are two interfaces available with the Field Communicator: Traditional and Dashboard interfaces. All steps using a Field Communicator will be using Dashboard interfaces. Figure 2-2 shows the Device Dashboard interface. As stated in “System readiness” on page 4, it is critical that the latest DD’s are loaded into the Field Communicator for optimal transmitter performance.

Visit Emerson.com/Rosemount to download latest DD library.

Turn on the Field Communicator by pressing the ON/OFF key. The Field Communicator will search for a HART-compatible device and indicate when the connection is made. If the Field Communicator fails to connect, it indicates that no device was found. If this occurs, refer to Section 6: Troubleshooting.

Field Communicator menu trees and Fast Keys are available in Appendix B: Field Communicator Menu Trees and Fast Keys Configuring with AMS Device Manager.

With an AMS Device Manager software package, you can commission and configure instruments, monitor status and alerts, troubleshoot from the control room, perform advanced diagnostics, manage calibration, and automatically document activities with a single application.

Full configuration capability with AMS Device Manager requires loading the most current Device Descriptor (DD) for this device. Download the latest DD at Emerson.com/Rosemount or Fieldcomm.org.

Note

All steps listed in this product manual using AMS Device Manager assume the use of Version 11.5.

LOI

The LOI requires option code M4 to be ordered. To activate the LOI push either configuration button. Configuration buttons are located on the LCD display (must remove housing cover to access the interface. See Table 2-2 for configuration button functionality and Figure 2-3 for configuration button location. When using the LOI for configuration, several features require multiple screens for a successful configuration. Data entered will be saved on a screen-by-screen basis; the LOI will indicate this by flashing “SAVED” on the LCD display each time.

Note

Entering into the LOI menu effectively disables the ability to write to the device by any other host or configuration tool. Make sure this is communicated to necessary personnel before using the LOI for device configuration.

Figure 2-3. LOI Configuration Buttons

A

A. Configuration buttons

Table 2-2. LOI Button Operation

LOI password

An LOI password can be entered and enabled to prevent review and modification of device configuration via the LOI. This does not prevent configuration from HART or through the control system. The LOI password is a four-digit code that is to be set by the user. If the password is lost or forgotten the master password is “9307”. The LOI password can be configured and enabled/disabled by HART communication via a Field Communicator, AMS Device Manager, or the LOI.

LOI menu trees are available in Appendix C: Local Operator Interface (LOI).

2.4.3Setting the loop to manual

When sending or requesting data that would disrupt the loop or change the output of the transmitter, set the process application loop to manual. The Field Communicator, AMS Device Manager or LOI will prompt you to set the loop to manual when necessary. Acknowledging this prompt does not set the loop to manual. The prompt is only a reminder; set the loop to manual as a separate operation.

2.4.4Failure mode

As part of normal operation, each transmitter continuously monitors its own performance. This automatic diagnostics routine is a timed series of checks repeated continuously. If diagnostics detect an input sensor failure or a failure in the transmitter electronics, the transmitter drives its output to low or high depending on the position of the failure mode switch. If the sensor temperature is outside the range limits, the transmitter saturates its output to 3.9 mA for standard configuration on the low end (3.8 mA if configured for NAMUR-compliant operation) and 20.5 mA on the high end (or NAMUR-compliant). These values are also custom configurable by the factory or using the Field Communicator.The values to which the transmitter drives its output in failure mode depend on whether it is configured to standard, NAMUR-compliant, or custom operation. See Rosemount 644 Tempeture Transmitter Product Data Sheet for standard and NAMUR-compliant operation parameters.

2.6Basic configuration of the transmitter

The Rosemount 644 Transmitter must be configured for certain basic variables in order to be operational. In many cases, all of these variables are pre-configured at the factory. Configuration may be required if the transmitter is not configured or if the configuration variables need revision.

2.6.1Mapping the HART variables

Field Communicator

The “Variable Mapping” menu displays the sequence of the process variables. Select the sequence below to change this configuration. The Rosemount 644 Transmitter single sensor input configuration screens allow selection of the primary variable (PV) and the secondary variable (SV). When the Select PV screen appears Snsr 1 must be selected.

The Rosemount 644 Transmitter dual-sensor option configuration screens allow selection of the Primary Variable (PV), Secondary Variable (SV), Tertiary Variable (TV), and Quaternary Variable (QV). Variable choices are Sensor 1, Sensor 2, Differential Temperature, Average Temperature, Terminal Temperature, and Not Used. The 4–20 mA analog signal represents the Primary Variable.

From the HOME screen, enter the Fast Key sequence.

AMS Device Manager

1.Right click on the device and select the Configure menu.

2.In the left navigation pane select Manual Setup then on the HART tab.

3.Map each variable individually or use the Re-map Variables method to guide you through the re-mapping process.

4.Select Apply when complete.

LOI

Follow flow chart to select the desired mapped variables. Use the SCROLL and ENTER buttons to select each variable. Save by selecting SAVE as indicated on the LCD screen when prompted. See Figure 2-4 on page 12 for an example of a mapped variable with the LOI.

2.6.2Configuring the sensor(s)

Sensor configuration includes setting the information for:

Sensor type

Connection type

Units

Damping values

Sensor serial number

RTD 2-wire offset

Field Communicator

The configure sensors method will guide you through the configuration of all necessary settings associated with configuring a sensor including:

For a full list of Sensor Types available with the Rosemount 644 Transmitter and their associated levels of accuracy.

From the HOME screen, enter the Fast Key sequence.

AMS Device Manager

1.Right click on the device and select Configure.

2.In the left navigation pane select Manual Setup and select the Sensor 1or Sensor 2 tab depending on the need.

3.Individually select the sensor type, connection, units and other sensor related information as desired from the drop down menus on the screen.

4.Select Apply when complete.

LOI

Reference Figure 2-5 for guidance on where to find Sensor Configuration in the LOI menu.

Figure 2-5. Configuring Sensors with LOI

* Available only if option code (S) or (D) is ordered.

Contact an Emerson™ representative for information on the temperature sensors, thermowells, and accessory mounting hardware that is available through Emerson.

2-wire RTD offset

The 2-wire offset feature allows the measured lead wire resistance to be input and corrected for, which results in the transmitter adjusting its temperature measurement for the error caused by this added resistance. Because of a lack of lead wire compensation within the RTD, temperature measurements made with a 2-wire RTD are often inaccurate.

This feature can be configured as a subset of the Sensor Configuration process in the Field Communicator, AMS Device Manager, and the LOI.

To utilize this feature properly perform the following steps:

1.Measure the lead wire resistance of both RTD leads after installing the 2-wire RTD and Rosemount 644 Transmitter.

2.Navigate to the 2-wire RTD Offset parameter.

3.Enter the total measured resistance of the two RTD leads at the 2-wire Offset prompt to ensure proper adjustment. The transmitter will adjust its temperature measurement to correct the error caused by lead wire resistance.

Field Communicator

From the HOME screen, enter the Fast Key sequence.

AMS Device Manager

1.Right click on the device and select Configure.

2.In the left navigation pane select Manual Setup and select the Sensor 1or Sensor 2 tab depending on the need. Find the 2-wire offset text field and enter the value.

3.Select Apply when complete.

2.6.3Setting output units

The Units can be configured for a number of different parameters in the Rosemount 644 Transmitter. Individual Units can be configured for:

Sensor 1

Sensor 2

Terminal temperature

Differential temperature

Average temperature

First good temperature

Each of the base parameters and calculated outputs from those values can have a unit of measure associated with it. Set the transmitter output to one of the following engineering units:

Celsius

Fahrenheit

Rankine

Kelvin

Ohms

Millivolts

Field Communicator

From the HOME screen, enter the Fast Key sequence.

AMS Device Manager

1.Right click on the device and select Configure.

2.In the left navigation pane select Manual Setup. The unit fields for various variables are spread over the Manual Setup tabs, click through the tabs and change the desired units.

3.Select Apply when complete.

LOI

Reference the below image for where to find the Units configuration in the LOI menu.

Figure 2-6. Configuring Units with LOI

* Available only if option code (S) or (D) is ordered.

** Available only if option codes (S) and (DC) are both ordered, or if option codes (D) and (DC) are both ordered.

Note

The list of choices available for Units after the primary menu is dependent on your Sensor configuration settings.

2.7Configure dual sensor options

Dual-sensor configuration deals with the functions that can be used with a transmitter ordered with Dual Sensor inputs. In the Rosemount 644 Transmitter these functions include:

Differential temperature

Average temperature

Hot Backup™ and sensor drift alert diagnostics (requires option code DC)

–First good temperature (requires options S and DC, or options D and DC)

2.7.1Differential temperature configuration

The Rosemount 644 Transmitter ordered and configured for dual-sensors can accept any two inputs then display the differential temperature between them. Use the following procedures to configure the transmitter to measure differential temperature.

Note

This procedure assumes the differential temperature is a calculated output of the device but does not re-assign it as the primary variable. If it desired for Differential to be the transmitter’s primary variable see “Mapping the HART variables” on page 11 to set it to PV.

Field Communicator

From the HOME screen, enter the Fast Key sequence.

AMS Device Manager

1.Right click on the device and select Configure.

2.In the left navigation pane choose Manual Setup.

3.On the Calculated Output Tab find the Differential Temperature group box.

4.Select Units and Damping settings then select Apply when complete.

LOI

To configure the Differential Temperature on the LOI, the Units and Damping values must be set separately. Reference figures below for where to find these in the menu.

Figure 2-7. Configuring Differential Units with LOI

* Available only if option code (S) or (D) is ordered.

** Available only if option codes (S) and (DC) are both ordered, or if option codes (D) and (DC) are both ordered.

**Available only if option codes (S) and (DC) are both ordered, or if option codes (D) and (DC) are both ordered.

2.7.2Average temperature configuration

The Rosemount 644 Transmitter ordered and configured for dual-sensors can output and display the Average temperature of any two inputs. Use the following procedures to configure the transmitter to measure the average temperature:

Note

This procedure assumes the average temperature is a calculated output of the device but does not re-assign it as the primary variable. If it is desired for average to be the transmitter’s primary variable see “Mapping the HART variables” on page 11 to set it to PV.

Field Communicator

From the HOME screen, enter the Fast Key sequence.

AMS Device Manager

1.Right click on the device and select Configure.

2.In the left navigation pane select Manual Setup.

3.On the Calculated Output Tab find the Average Temperature group box.

4.Select Units and Damping settings then select Apply when complete.

LOI

To configure average temperature on the LOI, the units and damping values must be set separately. Reference Figure 2-9 and Figure 2-10 below for where to find these in the menu.

DEG C UNITS DEG F UNITS DEG R UNITS KELVIN UNITS MV UNITS OHM UNITS BACK TO MENU EXIT MENU

* Available only if option code (S) or (D) is ordered.

** Available only if option codes (S) and (DC) are both ordered, or if option codes (D) and (DC) are both ordered.

Figure 2-10. Configuring Average Damping with LOI

* Available only if option code (S) or (D) is ordered.

** Available only if option codes (S) and (DC) are both ordered, or if option codes (D) and (DC) are both ordered.

Note

If Sensor 1 and/or Sensor 2 should fail while PV is configured for average temperature and Hot Backup is not enabled, the transmitter will go into alarm. For this reason, it is recommended when PV is Sensor Average, that Hot Backup be enabled when dual-element sensors are used, or when two temperature measurements are taken from the same point in the process. If a sensor failure occurs when Hot Backup is enabled, while PV is Sensor Average, three scenarios could result:

If Sensor 1 fails, the average will only be reading from Sensor 2, the working sensor

If Sensor 2 fails, the average will only be reading from Sensor 1, the working sensor

If both sensors fail simultaneously, the transmitter will go into alarm and the status available (via HART) states that both Sensor 1 and Sensor 2 have failed

In the first two scenarios, the 4–20 mA signal is not disrupted and the status available to the control system (via HART) specifies which sensor has failed.

2.7.3Hot Backup configuration

The Hot Backup feature configures the transmitter to automatically use Sensor 2 as the primary sensor if Sensor 1 fails. With Hot Backup enabled, the primary variable (PV) must either be first good or average. See the “NOTE” directly above for details on using Hot Backup when the PV is set to Average.

Sensors 1 or 2 can be mapped as the secondary variable (SV), tertiary variable (TV), or quaternary variable (QV). In the event of a primary variable (Sensor 1) failure, the transmitter enters Hot Backup mode and Sensor 2 becomes the PV. The 4–20 mA signal is not disrupted, and a status is available to the control system through HART that Sensor 1 has failed. An LCD display, if attached, displays the failed sensor status.

While configured to Hot Backup, if Sensor 2 fails but Sensor 1 is still operating properly, the transmitter continues to report the PV 4–20 mA analog output signal, while a status is available to the control system through HART that Sensor 2 has failed.

Resetting Hot Backup

In Hot Backup mode, if Sensor 1 does fail and Hot Backup is initiated, the transmitter will not revert back to Sensor 1 to control the 4–20 mA analog output until the Hot Backup mode is reset by re-enabling through HART, re-setting it through the LOI or by briefly powering down the transmitter.

Field Communicator

The field communicator will walk you through a method to correctly configure the necessary elements of the Hot Backup feature.

From the HOME screen, enter the Fast Key sequence.

AMS Device Manager

1.Right click on the device and select Configure.

2.In the left navigation pane select Manual Setup.

3.On the Diagnostics Tab find the Hot Backup group box.

4.Choose the button Configure Hot Backup or Reset Hot Backup depending on the desired function and walk through the guided steps.

5.Select Apply when complete.

LOI

To configure Hot Backup on the LOI, enable the mode and set the PV values. Reference Figure 2-11 for where to find these in the menu.

Figure 2-11. Configuring Hot Backup with LOI

* Available only if option code (S) or (D) is ordered.

** Available only if option codes (S) and (DC) are both ordered, or if option codes (D) and (DC) are both ordered.

For information on using Hot Backup in conjunction with the HART Tri-Loop™ see “Using the transmitter with the HART Tri-Loop” on page 35.

2.7.4Sensor drift alert configuration

The sensor drift alert command allows the transmitter to set a warning flag (through HART), or go into analog alarm when the temperature difference between sensor 1 and sensor 2 exceeds a user-defined limit.

This feature is useful when measuring the same process temperature with two sensors, ideally when using a dual-element sensor. When sensor drift alert mode is enabled, the user sets the maximum allowable difference, in engineering units, between sensor 1 and sensor 2. If this maximum difference is exceeded, a sensor drift alert warning flag will be set.

Though it defaults to WARNING, when configuring the transmitter for sensor drift alert, the user also has the option of specifying the analog output of the transmitter go into ALARM when sensor drifting is detected.

Note

Using dual sensor configuration in the Rosemount 644 Transmitter, the transmitter supports the configuration and simultaneous use of Hot Backup and sensor drift alert. If one sensor fails, the transmitter switches output to use the remaining good sensor. Should the difference between the two sensor readings exceed the configured threshold, the AO will go to alarm indicating the sensor drift condition. The combination of sensor drift alert and Hot Backup improves sensor diagnostic coverage while maintaining a high level of availability. Refer to the Rosemount 644 FMEDA report for the impact on safety.

Field Communicator

The Field Communicator will walk you through a method to correctly configure the necessary elements of a sensor drift alert feature.

From the HOME screen, enter the Fast Key sequence.

AMS Device Manager

1.Right click on the device and select Configure.

2.On the Diagnostics Tab find the Sensor Drift Alert group box.

3.Select to Enable the Mode and fill in the Units, Threshold and Damping values from the drop downs provided or select the Configure Sensor Drift Alert button and walk through the guided steps.

4.Select Apply when complete.

LOI

To configure sensor drift alert on the LOI, enable the mode, then set the PV, drift limit, and value for drift alert damping all separately. Reference figure below for where to find these in the menu.

Figure 2-12. Configuring Sensor Drift Alert with LOI

* Available only if option code (S) or (D) is ordered.

** Available only if option codes (S) and (DC) are both ordered, or if option codes (D) and (DC) are both ordered.

Note

Enabling the drift alert option to WARNING will set a flag (through the HART communications) whenever the maximum acceptable difference between sensor 1 and sensor 2 has been exceeded. For the transmitter’s analog signal to go into ALARM when drift alert is detected, select alarm during the configuration process.

2.8Configure device outputs

2.8.1Re-range the transmitter

Re-ranging the transmitter sets the measurement range to the limits of the expected readings for a certain application. Setting the measurement range to the limits of expected readings maximizes transmitter performance; the transmitter is most accurate when operated within the expected temperature range for the application.

The range of expected readings is defined by the Lower Range Value (LRV) and Upper Range Value (URV). The transmitter range values can be reset as often as necessary to reflect changing process conditions. For a complete listing of Range and Sensor limits.

Note

The re-range functions should not be confused with the trim functions. Although the re-range function matches a sensor input to a 4–20 mA output, as in conventional calibration, it does not affect the transmitter’s interpretation of the input.

Select from one of the methods below to re-range the transmitter.

Field Communicator

From the HOME screen, enter the Fast Key sequence.

AMS Device Manager

1.Right click on the device and select Configure.

2.In the left navigation pane select Manual Setup.

3.On the Analog Output Tab find the Primary Variable Configuration group box.

4.Change the Upper Range Value and Lower Range Value to their desired settings.

5.Select Apply when complete.

LOI

Reference the image below to find the range value configuration path on the LOI.

Figure 2-13. Re-ranging the Transmitter with LOI

2.8.2 Damping

The damping function changes the response time of the transmitter to smooth variations in output readings caused by rapid changes in input. Determine the appropriate damping setting based on the necessary response time, signal stability, and other requirements of the loop dynamics of the system. The default damping value is 5.0 seconds and can be reset to any value between 1 and 32 seconds.

The value chosen for damping affects the response time of the transmitter. When set to zero (disabled), the damping function is off and the transmitter output reacts to changes in input as quickly as the intermittent sensor algorithm allows. Increasing the damping value increases transmitter response time.

With damping enabled, if the temperature change is within 0.2 percent of the sensor limits, the transmitter measures the change in input every 500 milliseconds (for a single sensor device) and outputs values according to the following relationship:

( N – P) × 2T – U + P

Damped Value = ——————

2T + U

P = previous damped value

N = new sensor value

T = damping time constant

U = update rate

At the value to which the damping time constant is set, the transmitter output is at 63 percent of the input change and it continues to approach the input according to the damping equation above.

For example, as illustrated in Figure 2-14, if the temperature undergoes a step change—within 0.2 percent of the sensor limits—from 100 degrees to 110 degrees, and the damping is set to 5.0 seconds, the transmitter calculates and reports a new reading every 500 milliseconds using the damping equation. At 5.0 seconds, the transmitter outputs 106.3 degrees, or 63 percent of the input change, and the output continues to approach the input curve according to the equation above.

For information regarding the damping function when the input change is greater than 0.2 percent of the sensor limits, refer to “Intermittent sensor detection” on page 28.

Figure 2-14. Change in Input vs. Change in Output with Damping Set to Five Seconds

Damping can be applied to a number of parameters in the Rosemount 644 Transmitter. Variables that can be damped are:

Primary Variable (PV)

Sensor 1

Sensor 2

Differential temperature

Average temperature

First good temperature

Note

The instructions below only refer to the damping of the Primary Variable (PV).

Field Communicator

From the HOME screen, enter the Fast Key sequence.

AMS Device Manager

1.Right click on the device and select Configure.

2.In the left navigation pane select Manual Setup.

3.On the Sensor 1 Tab find the Setup group box.

4.Change the Damping Value to the desired setting.

5.Select Apply when complete.

LOI

Reference the figure below to find the damping configuration path on the LOI.

2.8.3Configure alarm and saturation levels

In normal operation, the transmitter will drive the output in response to measurements between the lower to upper saturation points. If the temperature goes outside the sensor limits, or if the output would be beyond the saturation points, the output will be limited to the associated saturation point.

The Rosemount 644 Transmitter automatically and continuously performs self-diagnostic routines. If the self-diagnostic routines detect a failure, the transmitter drives the output to configured alarm value based on the position of the alarm switch. The Alarm and Saturation settings allow the alarm settings (Hi or Low) and saturation values to be viewed and changed.

Failure mode alarm and saturation levels can be configured using a Field Communicator, AMS Device Manager, and the LOI. The following limitations exist for custom levels:

The low alarm value must be less than the Low Saturation level.

The high alarm value must be higher than the High Saturation level.

Alarm and Saturation levels must be separated by at least 0.1 mA

The configuration tool will provide an error message if the configuration rule is violated.

See table below for the common alarm and saturation levels.

Table 2-4. Rosemount Alarm and Saturation Values

1.Requires 0.1 mA gap between low alarm and low saturation values.

2.Rail mount transmitters have a high saturation max of 0.1 mA less than the high alarm setting, with a max value of 0.1 mA less than the high alarm max.

3.Rail mount transmitters have a low saturation min of 0.1 mA greater than the low alarm setting, with a minimum of 0.1 mA greater than the low alarm min.

Note

Transmitters set to HART multi-drop mode send all saturation and alarm information digitally; saturation and alarm conditions will not affect the analog output.

Field Communicator

From the HOME screen, enter the Fast Key sequence.

AMS Device Manager

1.Right click on the device and select Configure.

2.In the left navigation pane select Manual Setup.

3.On the Analog Output Tab find the Alarm and Saturation Levels group box.

4.Enter the High Alarm, High Saturation, Low Saturation and Low Alarm levels to the desired vales.

5.Select Apply when complete.

LOI

Reference the Figure 2-15 below to find the alarm and saturation value configuration path on the LOI.

Figure 2-15. Configuring Alarm and Saturation Values with LOI

* Available only if option code (S) or (D) is ordered.

**Available only if option codes (S) and (DC) are both ordered, or if option codes (D) and (DC) are both ordered.

2.8.4Configuring the LCD display

The LCD display configuration command allows customization of the LCD display to suit application requirements. The LCD display will alternate between the selected items with each item displaying for a three seconds interval.

Differential temperature

Reference Figure 2-16 to view the differences between the LCD display and LOI options available with the Rosemount 644 Transmitter.

Figure 2-16. LOI and LCD Display

Field Communicator

From the HOME screen, enter the Fast Key sequence.

AMS Device Manager

1.Right click on the device and select Configure.

2.In the left navigation pane select Manual Setup.

3.On the Display Tab there will be a group box with all available variables that can be displayed.

4.Check and uncheck the desired display variables, with a checked box indicating that the variable will be displayed.

5.Select “Apply” when complete.

LOI

Reference Figure 2-17 to find the LCD display value configuration path on the LOI.