Adjustment Of Zero Point - WIKA WU-20 Manual De Instrucciones

8. Adjustment of zero point

8. Adjustment of zero point
The UHP-Transducers are maintenance free. The transducer is factory calibrated and does not normally need
field adjustment.
WARNING!
For equipment with Ex nA nL marking, or if operated under nA nL conditions: Do not separate
when energised.
For verification and adjustment of the zero point, vent the transducer to zero (0)PSI for gage reference trans-
ducers. Use a 0.040" to 0.060" (1 to 1.5 mm) jeweler's screwdriver for adjustment.
For instruments with absolute pressure measuring ranges or +/- measuring ranges, a
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sufficient calibration equipment as well as a vacuum pump are also necessary for the zero
point adjustment.
Span adjustment is not necessary after zero point correction.
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Procedure
1. Restore power to the transducer.
2. Lift the sticker.
3. Adjust the zero point by means of the potentiometer
in pressureless state. Check the zero point by means
of a suitable instrument. Clockwise rotation means an
upward zero offset, anti-clockwise rotation means a
downward zero offset.
4. Push the sticker on.
For further information
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WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio, WU-2X
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