Adjustment Of Zero Point - WIKA WU-20 Mode D'emploi

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
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need field adjustment.
WARNING!
For equipment with Ex nA ic and Ex ec ic certification, or if operated under nA ic or ec ic
conditions: Do not separate when energised.
For verification and adjustment of the zero point, vent the transducer to zero (0)PSI for gauge reference
transducers. 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 potentio-
meter in pressureless state. Check the zero point
by means of a suitable instrument. Clockwise
rotation means an upward zero offset, anti-clock-
wise rotation means a downward zero offset.
4. Push the sticker on.
For further information
(+49) 9372 / 132-0
20 WIKA operating instructions, model WU-2x