WIKA WUD-20 Betriebsanleitung Seite 8

7. Initial start-up and operation
Face Seal Connections (only WUD-20, WUD-25)
For connections compatible with face seal-fittings:
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 mount-
ing 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 specifications.
4. With that the pressure transducer is mechanically connected. Electrical connection possibilities are described in the
following chapter.
Welding Connections (only WUD-20, WUD-25)
The weld needs to be fully penetrated, but amperage and heat need to be minimised. We recommend flowing Argon gas
through the pressure transducer during welding. This will help to cool the pressure transducer. Prior to welding tubing to the
pressure transducer, it is recommended that a few test welds be made.
WARNING!
Make sure the pressure transducer is not connected to any other device, prior to arc welding.
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Disconnect the pressure transducer from any electrical device.
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The operator is responsible for the material compatibility as well as correct handling, operation and mainte-
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nance.
Prepare the pressure transducer for use
1. Adjust the zero point (please refer to chapter 8 "Adjustment of zero point").
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.)
4.Optionally you have to set the switch points (please refer to page 18).
MSM, Modular Surface Mount (only WUD-26)
Please observe the corresponding technical specifications, such as torques and mounting position of the contact components.
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Operating instructions/Betriebsanleitung, WUD-2x
GB