WIKA WU-20 Mode D'emploi page 10

7. Starting, operation
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. Tight-
en the swivel female face seal hand-tight and adjust the instrument to the desired position. When tighten-
ing or untightening at mounting parts (valves etc.) or fittings, ensure that the threads do not get jammed.
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 specifica-
tions.
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.
WARNING!
Make sure the transducer is not connected to any other device, prior to arc welding.
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Disconnect the transducer from any electrical device.
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The operator is responsible for the material compatibility as well as correct handling, opera-
■
tion 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.
10 WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio, WU-2X
-fittings:
®
GB