Adjustment Of Zero Point - WIKA WUC-10 Betriebsanleitung

8. Adjustment of zero point

Functional test
The output signal must be proportional to the pressure. If not, this might point to a
damage of the diaphragm. In that case refer to chapter 10 „Troubleshooting".
Open pressure connections only after the system is without pressure!
„
Observe the ambient and working conditions outlined in section 7
„
„Technical data.
Warning
Please make sure that the transducer is only used within the over load
„
threshold limit at all times!
When touching the transducer, keep in mind that the surfaces of the instru-
ment components might get hot during operation.
Caution
8. Adjustment of zero point
The UHP-Transducers are maintenance free. The transducer is factory calibrated and does
not normally need field adjustment.
For equipment with Ex nA nL marking, or if operated under nA nL condi-
„
!
tions: Do not separate when energised.
Warning
For verification and adjustment of the zero point, vent the transducer to zero (0)PSI for gage
reference transducers. Use a 0.040" to 0.060" (1 to 1.5 mm) jeweler's screwdriver for 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 down
ward zero offset.
4. Push the sticker on.
16
WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio WUC-1X
For further information
(+49) 9372/132-8976
GB