Functional Test; Adjustment Of Zero Point / Span; Maintenance, Accessories - WIKA IS-20-S Mode D'emploi

7. Starting, operation / 8. Adjustment of zero point / span
Specifications Model IS-20-S, IS-21-S, IS-20-F, IS-21-F, IS-20-H
Weight » Model IS-2X-S/F kg
» Model IS-20-H kg
* )
In an oxygen version model IS-21 is not available. In an oxygen version model IS-20 is only available in gauge pressure ranges
≥ 0.25 bar with media temperatures between -4 ... +140 °F / -20 ... +60 °C and using stainless steel or Elgiloy
{ } Items in curved brackets are optional extras for additional price.
When designing your plant, take into account that the stated values (e.g.burst pressure,
over pressure safety) apply depending on the material, thread and sealing element used.

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 pressure transmitter is only used within the over
load threshold limit at all times!
When touching the pressure transmitter, keep in mind that the surfaces of
the instrument components might get hot during operation.
Caution
8. Adjustment of zero point / span (only for pressure transmitter with clamping nut)
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).
18 WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio
Model IS-2X-S: Approx. 0.2 Model IS-2X-F: Approx. 0.35
Approx. 0.3 (approx. 0.45 with version field case)
® wetted parts.
GB

8. Adjustment of zero point / span

IS-20-S, IS-21-S, IS-20-H:
Female
connector
Sealing
Clamping
nut
Male
connector
Sealing
Case with
pressure
A
connection
Make sure wires are not cut or pinche during disassembly and reassembly of the connector.
„
IS-2X-S, IS-20-H: Remove the female connector. Open the pressure transmitter by deta-
„
ching the clamping nut (see Fig. A ). Carefully remove the male connector from the case.
IS-2X-F, IS-20-H with field case: Open the pressure transmitter by twisting off the fied case
„
over.
Adjust the zero point (Z) (see Fig. B ) by generating the lower limit of the pressure range.
„
Adjust the span (S) by generating the higher limit of the pressure range.
„
Check the zero point.
„
Reassemble the instrument carefully.
„
„ Make sure all sealings and o-rings are not damaged and correctly installed to assure the
rated moisture ingress protection.
Recommended recalibration cycle: 1 year

9. Maintenance, accessories

„ WIKA pressure transmitters require no maintenance.
„ Have repairs performed by the manufacturer only.
IS-2X WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio
IS-20-F, IS-21-F,
IS-20-H with field case:
B
B
S = Span
Z = Zero
Z = Zero
If the zero point is incorrect, repeat procedure as required.
„
For further information (+49) 9372/132-295
GB
S = Span
19
IS-2X