Faults; Maintenance And Cleaning; Maintenance - WIKA PGT23.1 0 Serie, PGT26.1 08 Serie Betriebsanleitung

6. Faults / 7. Maintenance and cleaning

Faults

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 exchange of the instrument chapters 8 "Dismounting, return and disposal" and 5
"Commissioning, operation" must be observed.

7. Maintenance and cleaning

7.1 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.
Testing of filled instruments
For filled instruments, the level must be checked once or twice every year.
The liquid level must not drop below 75 % of the instrument diameter.
22
Causes
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.
Pressure gauges with output signal, optionally for hazardous areas
Measures
Check voltage supply and
cables.
Check pin assignment.
Clean pressure port at pro-
cess connection
Check pin assignment.
Replace instrument.
Remove the terminal bridge.
See chapter 5.3. "Zero point
setting".
Replace instrument.
Check voltage supply and
cables.
Maintain permissible load.
See chapter 5.3. "Zero point
setting".
See chapter 5.3. "Zero point
setting".