Electrical Connection - WIKA WU-20 Manual De Instrucciones

7. Starting, operation
„ Remove the protection cap only just before installation.
„ When mounting the instrument, ensure that the sealing faces of the instrument and
the measuring point are clean and undamaged.
„ Do not scratch or nick the bead. Do not over tighten. Damage to the bead will affect
the fitting's performance and may cause leakage in the system.
Screw in or unscrew the instrument only via the flats using a suitable tool and the
„
prescribed torque. The appropriate torque depends on the dimension of the pressure
connection and on the sealing element used (form/material). Do not use the case as
working surface for screwing in or unscrewing the instrument.
When screwing the transmitter in, ensure that the threads are not jammed.
„
For transducer with Ex-marking:
„ Protect the inner diaphragm against any contact with abrasive substances
and pressure peaks and do not touch it with tools. Damage of the
Warning
diaphragm may result in losing the explosion protection.
„ Observe the technical data for the use of the transducer in connection with
aggressive / corrosive media and for the avoidance of mechanical hazards.
Mechanical Connection
„ Prepare the gas line connections appropriately.
„ You should blow clean all fitting components (such as sealing gaskets, for example) using
a clean/filtered gas. Please refer to the specific technical guides furnished by the gasket
manufacturers for additional specifications.
You can then remove the protective film, as well as any plastic caps there may be for
„
protecting high-quality fittings.
Face Seal Connections (only WU-20, WU-25)
For connections compatible with VCR
1. Hold the swivel female face seal / swivel male face seal, mounting part (valve etc.) or case
hexagon. Tighten the swivel female face seal hand-tight and adjust the instrument to the
desired position. When tightening or untightening at mounting parts (valves etc.) or fittings,
ensure that the threads do not get jammed.
8 WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio WU-2X
-fittings:
®
GB
7. Starting, operation
2. Hold the swivel female face seal with a suitable open-end wrench. Tighten the swivel
female face seal / swivel male face seal or mounting part (valve etc.) by a 1/8 or 1/4 turn
(depending on the sealing elements used) beyond the hand-tight position.
3. Please refer to the specific technical guides furnished by the fitting manufacturers for
additional specifications.
4. With that the transducer is mechanically connected. Electrical connection possibilities are
described in the following section.
Welding Connections (only WU-20, WU-25)
The weld needs to be fully penetrating, but amperage and heat need to be minimised. We
recommend flowing Argon gas through the transducer during welding. This will help to cool
the transducer. Prior to welding tubing to the transducer, it is recommended that a few test
welds be made.
Make sure the transducer is not connected to any other device, prior to arc
„
!
welding.
Disconnect the transducer from any electrical device.
„
Warning
„ The operator is responsible for the material compatibility as well as correct
handling, operation and maintenance.
Prepare the transducer for use
1. Adjust the zero point (please refer to chapter Zero Adjustment).
2. Verify integrity of the weld or seal by appropriate helium leak-testing procedures.
3. Turn the gas flow ON then OFF, 10 times to remove any particles generated during
installation. (The flow rate used should at least equal the process flow specifications.)
MSM, Modular Surface Mount (only WU-26)
Please observe the corresponding technical specifications, such as torques and mounting
position of the contact components.

Electrical connection

Connect the enclosure to ground through the process connection, against
!
electromagnetic fields and electrostatic discharge.
Warning
WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio WU-2X
GB
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