Adjustment of zero point – WIKA WU-26 User Manual

Page 17

WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio, WU-2X

11553678.02 GB/D/F/E 10/2012

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

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.

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

(+49) 9372/132-8976

This manual is related to the following products: