Gestra lrgt 16 1 инструкция по эксплуатации

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• 28 818726-06/03-2017cm (808546-10) · GESTRA AG · Bremen · Printed in Germany You can find our authorised agents around the world at: www.gestra.com GESTRA AG Münchener Straße 77 28215 Bremen Germany Telefon +49 421 3503-0 Telefax +49 421 3503-393 E-mail [email protected] Web www.gestra.de
  

• 13 GE STRAS te amSyst em s GE STRAS te amSyst em s GES TRA LRGT …. GES TRA LRGT µS — ppm NW LW NB A R* Installation examples LRGT 16-1, LRGT 16-2, LRGT 17-1 Fig. 6 Conductivity monitoring, conductivity transmitter directly installed via flanged connection on side of boiler LRGT 16-1 LRGT 16-2 LRGT 17-1 0 a 415 336 G 1 A, ISO 228 R*: LRGT 16-1, LRGT 17-1 R = 30 mm LRGT 16-2 R = 60 mm Conductivity monitoring and continuous boiler blowdown, direct installation of conductivity trans- mitter via T-type connector and connection of a continuous blowdown valve Fig.

• 5 Important notes Function The conductivity transmitters are used as conductivity limiters and continuous blowdown controllers in steam boilers in combination with the following equipment: Conductivity controller LRR 1-51 Conductivity controller LRR 1-53 Industrial controller KS 90-1 Conductivity transmitters LRGT 16-1, LRGT 17-1 are mainly used in steam boilers with low TDS content, e.g. steam regenerators, high-press

• 20 Commissioning procedure Establishing the measuring range and actual value output Note  When mains voltage is supplied (during commissioning), the first output will be 4 mA, then the output current increases until it reaches the actual value. Checking the setting of temperature coefficient T K For linear compensation of the measured conductivity value at 25°C, the temperature coefficient T k is factory set to 2.1 % per

• 27 Removing and disposing of the conductivity transmitter Removing and disposing of conductivity transmitters LRGT 16-1, LRGT 16-2, LRGT 17-1 1. Switch off the supply voltage. 2. Unscrew the cover screws f and remove the housing cover g. 3. Disconnect the connecting wires from terminal strip n and pull wires out of the cable gland. 4. Make sure the equipment is not hot or under pressure before dismantling it. Dispose of the conductivity transmitter in accordance with statutory waste disposal provisions. Maintenance D

• 7 LRGT 16-1, LRGT 16-2, LRGT 17-1 Technical data Service pressure LRGT 16-1: 32 bar at 238°C LRGT 16-2: 32 bar at 238°C LRGT 17-1: 60 bar at 275°C Mechanical connection Thread G1 A, ISO 228 Materials Screw-in body: 1.4571, X6CrNiMoTi17-12-2 Measuring electrode(s): 1.4571, X6CrNiMoTi17-12-2 Electrode rod insulation: PTFE Terminal box: 3.2161 G AlSi8Cu3 LRGT 16-1, LRGT 17-1: Measuring tube/screw 1.4571, X6CrNiMoTi17-12-2 LRGT 16-1, LRGT 16-2: Spacer discs PTFE / PEEK LRGT 17-1: Spacer discs PEEK HT Measuring length a

• 15 GESTRA LRGT 16-1 GESTRASteam Systems µS-ppm Electrical connection LRGT 16-1, LRGT 16-2, LRGT 17-1 Fig. 9 Fig. 10 Diagram of LRGT 16-1 (shown without cover plate) f g h ON 1234 56 7890 p i Toggle switch, white j lk n o m h A self-locking fixing nut i connects the terminal box to the electrode part. Before establishing the electrical connection, you can therefore rotate the terminal box max. +/– 180° into the de

• 14 M GESTRA Steam System sGESTRA Steam System s GESTRA LRGT …. GESTRA LRGT µS-ppm Installation examples LRGT 16-1, LRGT 16-2, LRGT 17-1 Fig. 8 Conductivity monitoring and continuous boiler blowdown, installation of conductivity transmitter in the blowdown line via a separate level pot d c DN 15-40 Outlet Inlet DN 15-40 e a LRGT 16-1 LRGT 16-2 LRGT 17-1 G 1 A, ISO 228 Key 0 Boiler drum a Sealing ring 33 x 39, form D, DIN 7603, 1.4301, bright annealed b T-type connector, provided on boiler, DN 50 c Shut-off valve GAV d Continuous blowdown valve BAE

• 11 Note  The boiler connection with flange must be tested during the preliminary boiler inspection.  Refer to pages 13 and 14 for typical installation examples. LRGT 16-1 (for marine applications)  Max. admissible measuring/installed length: 400 mm.  When installing the conductivity transmitter in a steam boiler, make sure it is securely fixed in place and cannot be unscrewed inadvertently. Installation Attention  Install the conductivity transmitter horizontally or with a vertical inclination. The measuring surface(s) must be permanent

• 4 Important notes Intended use Use conductivity transmitters LRGT 16-1, LRGT 16-2 and LRGT 17-1 only for measuring electrical conductivity in liquids. Conductivity transmitters LRGT 16-1 / LRGT 16-2/17-1 can be used as conductivity limiters or continuous blowdown controllers in steam boilers in combination with the following equipment: Conductivity controller LRR 1-51 Conductivity controller LRR 1-53 Industrial controller KS 90-1 To guarantee trouble-free operation, observe the requirements ma

Installation Instructions 810701-00 Spector compact

Conductivity Transmitter System LRGT 16 — 1

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Important Notes

Safety Note

Use conductivity transmitter system LRGT 16-1 only for monitoring electrical conductivity in liquids.

The equipment has to be supplied with 24 V DC from a safety power supply unit (PSU) in accordance with DIN VDE 0106 (safe supply isolation). The PSU must be equipped with an overcurrent protective device according to DIN EN 61010-1/VDE 0411.

The transmitter system LRGT 16-1 must only be installed by qualified staff.

Qualified staff are those persons who — through adequate training in electrical engineering, the use and application of safety equipment in accordance with regulations concerning electrical safety systems, and first aid & accident prevention have achieved a recognised level of competence appropriate to the installation and commissioning of this critical safety device.

Danger

When loosening the conductivity transmitter system steam or hot water might escape. This presents the danger of scalding. It is therefore essential not to dismantle the conductivity transmitter system unless the boiler pressure is verified to be zero.

Explanatory Notes

Scope of Supply

LRGT 16-1

1 Control electrode with joint ring D 33 x 39 DIN 7603-1.4301 E8P 1 Terminal box with conductivity transmitter

1 Installation manual

System Description

The LRGT 16-1 is a compact-design conductivity transmitter system consisting of a conductivity electrode, a temperature sensor for detecting the fluid temperature and an integrated conductivity transmitter. The equipment works according to the conductivity measurement two-electrode control principle and provides a conductivity-dependent and temperature compensated measuring current of 4 — 20 mA.

The conductivity transmitter system is designed to measure the electrical conductivity in conductive fluids.

If the LRGT 16-1 is connected to the industrial controller type KS 90 the equipment can be used as conductivity limiter and/or continuous blowdown controller in steam boilers,

(pressurised) hot-water boilers and condensate systems.

Type Approvals

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Function

A measuring current of variable frequency flows through the fluid and creates a potential gradient between the measuring electrode and the measuring tube. The potential gradient is evaluated as measuring voltage UU.

In order to compensate for polarisation, which would reduce the measuring current, the measuring frequency is adapted accordingly. The resulting measuring current is sensed and transmitted as measuring voltage UI.

The electrical conductivity changes as a function of temperature. The resistance thermometer integrated in the electrode measures the fluid temperature and establishes a reference temperature on which the measured values will be based.

The electrical conductivity is calculated from the measuring voltages UU and UI and — depending on the adjusted temperature coefficient Tk — is based linearly on the reference temperature 25 °C. After converting it into a conductivity-proportional current signal, a current of 4 — 20 mA is provided for external processing.

The cables leading to the measuring electrode, the measuring tube and the resistance thermometer are monitored for interruption and short circuits. In addition, the electronic insert is protected against excessive temperatures in the terminal box. In case of a malfunction the LEDs are permanently illuminated or flashing and the current signal is set to 0 or 0.5 mA.

The transmitter is parameterised via code switch. The code switch can also be used for adaptation of the cell constant and triggering a functional test.

The electrical conductivity is measured in µS/cm. In some countries use is also made of ppm (parts per million). Conversion: 1 µS/cm = 0.5 ppm.

Installation

The conductivity transmitter system is designed such that it can be screwed directly into boiler standpipes or suitably tapped flanges.

The electrode must be installed such that it is always submerged.

The installation in protection tubes is not permitted according to WÜ 100.

Ensure a minimum distance of approx. 20 mm between the lower part of the measuring tube and the boiler wall, the smoke tubes, any other metal parts and the low water level (LW).

Installation of the Measuring Electrode

1.Check seating surfaces of threads or flange provided on vessel or boiler standpipe.

2.Place ring joint onto the seating surface of the transmitter. Note: Use only ring joint (of stainless steel 1.4301 E8P) D 33 x 39 to DIN 7603 supplied with the electrode.

3.Apply a light smear of silicone grease (e. g. DOW Corning 111 Compound) to electrode thread.

4.Screw conductivity transmitter electrode into threads or flange provided on vessel or boiler standpipe and tighten with a 41 mm open-end spanner. The torque required when cold is 150 Nm. The tapped hole must conform to DIN 3852 part 2, 1″ BSP (DIN

ISO 228) form X or Y, standard version. The subsequent hole must have a diameter of > 24 mm.

5

Reducing length of installation and measuring length (control range)

The measuring tube and the electrode can be cut to suit the individual requirements of the installation.

1.Carefully determine the required reduction of length — measured from the bottom end of the measuring tube — and mark this on the measuring tube.

2.Only slacken locking grub screw using a screwdriver size 1.3 for socket-head cap screws.

3.Unscrew measuring tube and cut it to the length marked.

4.Unscrew spacer disc.

5.Mark the reduction of length — measured from the extreme end of the tip — on the electrode tip.

6.Cut electrode tip to length. Cut back 10 — 12 mm of the insulation.

7.Screw back the spacer disc onto the electrode tip and fasten fingertight with a 12 mm open end spanner.

8.Screw back measuring tube with a torque of 50 Nm and tighten locking grub screw.

Attention

!The seating surfaces and threads on the vessel and mounting flanges must be accurately machined.

!Do not bend the electrode tip when cutting. Do not subject electrode to physical shocks.

!Do not lag the electrode body.

!The conductivity transmitter system can be installed horizontally or with a vertical inclination. The measuring surface must be permanently submerged.

Tools

!41 mm open-end spanner

!12 mm open-end spanner

!Screwdriver size 1.3 for socket-head cap screws

!Hacksaw

!Flat file, cut 2

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Reducing length of installation and measuring length (control range)

7

Aligning, removing and mounting the terminal box

Align terminal box

1.Undo cover screws (cross-recess head screws M4) and remove one terminal cover. The arrow on the name plate points towards this cover.

2.Loosen fixing nut using 18 (19) mm open-end spanner and turn terminal box into desired direction

(cable outlet).

3.Re-tighten fixing nut with a torque of 30 Nm.

4.Re-install cover, tighten cover screws, ensuring correct seat of the cover gasket.

If required you can also remove the terminal box from the electrode and re-install it afterwards.

Remove terminal box

1.Loosen cover screws (cross-recess head screws M4) and remove one terminal cover.

The arrow on the name plate points towards this cover.

2.Undo fixing screws for cover plate and remove plate.

3.Pull electrode cables from terminal lugs (electronic insert, functional earthing).

4.Loosen fixing nut with 18 (19) mm open-end spanner and remove it.

5.Pull electrode cables through fixing nut.

6.Remove terminal box. Pull all electrode cables through hole for fixing screw.

Install terminal box

1.Pull all electrode cables through hole for fixing screw in terminal box.

2.Place terminal box onto electrode and turn it into the desired direction, taking the cable outlet into consideration. Ensure correct seat of the gasket between the electrode and the terminal box.

3.Pull all electrode cables through fixing nut. Screw nut on fixing bolt and tighten with a torque of 30 Nm.

4.Connect electrode cables according to wiring diagram to terminal lugs (electronic insert, functional earthing).

5.Screw back cover plate. Install terminal cover and tighten cover screws, ensuring correct seat of cover gasket.

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Wiring

Connect conductivity transmitter

The equipment has to be supplied with 24 V DC from a safety power supply unit (PSU) in accordance with DIN VDE 0106 (safe supply isolation). The PSU must be equipped with an overcurrent protective device according to DIN EN 61010-1/VDE 0411.

The following steps 1 — 5 do not apply for equipment fitted with a connector.

For wiring use flexible screened control cable, min. conductor size 0.75 mm².

1.Remove terminal strip and pull connecting cable through cable gland.

2.Strip off approx. 40 mm of cable insulation coating and remove approx. 5 mm of conductor end insulation.

3.Carry out wiring in accordance with wiring diagram.

4.Plug in terminal strip.

5.Seal cable entry by tightening cable glands. Use sealing plug to seal off cable glands that are not used.

6.Install terminal cover and tighten cover screws, ensuring correct seat of cover gasket.

Tools

!Screwdriver size 1 for cross-recess head screws

!Screwdriver size 2.5 for slotted screws, completely insulated to VDE 0680

!18 (19) mm open-end spanner

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