Faults; Maintenance And Cleaning Maintenance - WIKA 712.15.160 Betriebsanleitung

5. Faults / 6. Maintenance and cleaning

5. Faults

Faults
No input pressure.
No output signal.
EN
Constant output signal
upon change in pressure
Too high, constant output
signal upon change in
pressure.
Signal span too small.
Zero point signal too low or
too high.
For the replacement of the instrument chapters 7 "Dismounting, return and disposal" and 4
"Commissioning, operation" must be observed.
6. Maintenance and cleaning
6.1 Maintenance
The instruments are maintenance-free.
The indicator and switching function should be checked once or twice every year. For this the
instrument must be disconnected from the process to check with a pressure testing device.
Differential pressure gauge models 712.15.160, 732.15.160, optional for hazardous areas
24
Causes
Pressure compensating valve open.
Insufficient supply voltage or cable
break.
Wrong pin assignment.
Defective transmitter electronics due
to overvoltage.
Pressure port blocked at process
connection.
Supply voltage connected the wrong
way. (I = ca. 4.5 mA).
Defective transmitter electronics
Bridge on terminals 5 and 6 not
removed (I = approx. 9.5 mA).
Defective transmitter electronics due
to overvoltage.
Insufficient supply voltage.
Load too high.
Zero point maladjusted.
Zero point maladjusted.
Mechanical overload
Measures
Close the pressure
compensating valve.
Check voltage supply and
cables.
Check pin assignment.
Replace instrument.
Clean pressure port at process
connection.
Check pin assignment.
Replace instrument.
Remove the terminal bridge.
Set the zero point.
Replace instrument.
Check voltage supply and
cables.
Maintain permissible load.
Set the zero point.
Set the zero point.
Replace instrument.