WIKA IS-20-S Mode D'emploi page 11

Problem Possible cause
No output Power supply failure
Open wiring
Wiring reversed
No pressure or port blocked
transmitter failure due to wrong
Supply voltage or power surge
Output steady as pressure Pressure port blocked
changes Transmitter over-pressurized
Transmitter failure due to wrong
supply voltage or power surge
Full span output low Supply voltage too low
Load impedance too high or too low
Transmitter over-pressurized
Zero signal too low or too high Transmitter over-pressurized
Non-linear output Transmitter over-pressurized
*) For transmitters with non accessible adjustment potentiometers, or instruments that cannot be recalibrated using the
zero and span potentiometers, adjusting the controller or display device can usually compensate for small changes or
drifts in the output signal. Test the system for proper operation after adjustments are made. An excessive change in the
output signal that cannot be corrected by calibration indicates possible transmitter damage. This may cause the output
to be non-linear, requiring transmitter replacement.
Remedy
Check power supply
Check continuity
Correct polarity
Check pressure port
Replace transmitter
Check pressure port
Replace transmitter
Replace Transmitter
Check supply voltage
Adjust load or supply voltage
Recalibrate Transmitter
)
Replace Transmitter *
Recalibrate Transmitter
)
Replace Transmitter *
Replace Transmitter