WIKA WUD-20 Mode D'emploi page 27

6. Faults
Failure
Output signal unchanged after
change in pressure
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
WIKA operating instructions Ultra High Purity transducer, model WUD-2x
Possible cause
Mechanical overload through
overpressure
Wrong supply voltage or current spike Replace instrument
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
Procedure
Replace instrument; if failure
reoccurs, consult the manufacturer
Adjust the voltage supply to corre-
spond with the Operating Instruc-
tions
1)
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 permis-
sible range; observe the allowable
temperature error (see Operating
Instructions)
Replace instrument
Contact the manufacturer and
replace the instrument
EN
1)
27