WIKA WU-20 Mode D'emploi page 22

10. Troubleshooting
Failure
Output signal unchanged after change in
pressure
EN
No output signal
No/False output signal
Abnormal output signal or abnormal zero point
signal
Abnormal zero point signal
Signal span dropping off/too small
Signal span too small
*) Make sure that after the setting the unit is working properly. In case the error continues to exist send in the instrument for reparation (or replace the unit).
In case of unjustified reclamation we charge the reclamation handling expenses.
If the problem persists, contact our sales department.
22
Possible cause
Mechanical overload through overpressure
Wrong supply voltage or current spike
No/incorrect voltage supply or current spike
Cable break
Incorrectly wired (e.g. Connected as 2-wire
instead of 3-wire system)
Zero point set wrongly
Medium or ambient temperature too high/
too low
Diaphragm is damaged, e.g. through impact,
abrasive/agressive media; corrosion of
diaphragm/pressure connector.
Diaphragm is damaged, e.g. through impact,
abrasive/agressive media; corrosion of
diaphragm/pressure connector
Power supply too high/too low
Mechanical overload through overpressure
Procedure
Replace instrument; if failure reoccurs,
consult the manufacturer *)
Replace instrument
Adjust the voltage supply to correspond
with the Operating Instructions *)
Check connections and cable
Follow pin assignment (see Instrument
Label / Operating Instructions)
Adjust zero point correctly (see chapter
8); a sufficiently accurate current/volt
meter should be used
Control the internal temperature of the
instrument within the permissible range;
observe the allowable temperature error
(see Operating Instructions)
Replace instrument
Contact the manufacturer and replace
the instrument
Correct the power supply in line with the
Operating Instructions
Re-calibrate the instrument *)
WIKA operating instructions, model WU-2x