Analytical Industries GPR-1800 IS ATEX Trace PPM Oxygen Transmitter - Manual (Page 35)

Advanced Instruments, Inc
35
8. Troubleshooting
Symptom Possible Cause Recommended Action
Slow recovery or At installation, defective
sensor
Air leak in sample system
connection(s)
Abnormality in zero gas
Damaged in service -
prolonged exposure to air,
electrolyte leak
Sensor nearing end of life
Replace sensor if recovery unacceptable
or O
2
reading fails to reach 10% of lowest
range
Leak test the entire sample system: Vary
the flow rate, if the O
2
reading changes
inversely with the change in flow rate
indicates an air leak - correct source of
leak
Qualify zero gas (using portable
transmitter)
Replace sensor
Replace sensor
High O
2
reading
after installing
or replacing sensor
Transmitter calibrated
before sensor stabilized
caused by:
1) Prolonged exposure to
ambient air, worse if sensor
was un-shorted
2) Air leak in sample
system connection(s)
3) Abnormality in zero gas
Allow O
2
reading to stabilize before
making the span/calibration adjustment
Continue purge with zero gas
Leak test the entire sample system
(above)
Qualify zero gas (using portable
transmitter)
High O
2
reading
Sampling
Flow rate exceeds limits
Pressurized sensor
Improper sensor selection
Correct pressure and flow rate
Remove restriction on vent line
Replace GPR/PSR sensor with XLT
sensor when CO
2
or acid gases are
present