Adjustment Of Zero Point / Span - WIKA F-20 Betriebsanleitung

6. Specifications / 7. Adjustment of zero point / span
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 9 "Troubleshooting".
WARNING!
Open pressure connections only after the system is without pressure!
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Observe the ambient and working conditions outlined in chapter 6 "Specifications".
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Please make sure that the pressure transmitter is only used within the overload threshold limit at all times!
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WARNING!
When touching the pressure transmitter, keep in mind that the surfaces of the instrument components
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might get hot during operation.

7. Adjustment of zero point / span

We do not recommend to adjust the span potentiometer. It is used for adjustment ex factory and should not
be adjusted by you unless you have adequate calibration equipment at your disposal (at least three times
more accurate than the instrument being tested).
Make sure wires are not cut or pinche during disassembly and reassembly of the connector. Open the pressure
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transmitter by twisting off the field case cover.
Adjust the zero point (Z) by generating the lower limit of the pressure range.
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Adjust the span (S) by generating the higher limit of the pressure range.
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Check the zero point.
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If the zero point is incorrect, repeat procedure as required.
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Reassemble the instrument carefully.
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Make sure all sealings and o-rings are not damaged and correctly installed to assure the rated moisture ingress protection.
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WIKA operating instructions pressure transmitters, models F-20, F-21
EN
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