WIKA D-20-9 Mode D'emploi page 15

6. Faults
Faults
Deviating zero point signal
Constant output signal upon change in
pressure
Hot case surface
Signal span too small
Signal span drops
Signal span varies
Signal span drops/too small
WIKA operating instructions, pressure sensor, models D-20-9, D-21-9
Causes
Other mounting position
Overload safety exceeded
Too high/low working temperature
Mechanical overload caused by overpres-
sure
Wrong power supply or current pulse
Internal short-circuit
Power supply too high/low
Moisture has entered into the electrical
connection
EMC interference sources in the environ-
ment; for example, frequency converter
Pressure of the medium is fluctuating
Power supply is fluctuating
Mechanical overload caused by overpres-
sure (e.g. diaphragm damaged)
Measures
Correct the zero point via the controller
or software
Observe the permissible overload safety
Observe the permissible temperatures
Replace instrument; if it fails repeatedly,
contact the manufacturer
Replace instrument; if it fails repeatedly,
contact the manufacturer
Replace instrument
Correct the power supply, see product
label
Install the electrical connection correctly
Shield instrument; cable shield; remove
source of interference
Damping; consulting by the manufacturer
Stabilise the power supply and suppress
interference
Replace instrument; if it fails repeatedly,
contact the manufacturer
EN
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