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8.
Troubleshooting
Abnormal symptom
No indications
FAIL lamp lit
Low value displayed
High value displayed
Slow response
Large error in measurement
Occasional, large fluctuations
in readings
Calibration fails
No alarm contact signal is
activated1.
IM 11M10A01-03E
The table below summarizes troubles that may develop in the OX102, problem source
and corrective action.
Problem source
1. No power applied
2. Fuse has blown
1. Sensor connector failure
2. Sensor heater is disconnected
1. Operating pressure is out of specified range
2. Improper calibration
3. Sensor failure
4. Expired activated carbon has been used
1. Ambient pressure around sensor is negative
2. Sensor has been clogged
1. Operating temperature is out of specified range
2. Operating pressure is out of specified range
3. Sample gas contains oxidation-reduction
gas or corrosive gas
4. Sensor head touches wall
5. Expired activated carbon has been used
1. Sensor failure
2. Operating pressure is out of specified range
1. Improper calibration gas concentration
2. Sensor failure
3. Operating pressure is out of specified range
4. Useful life of activated charcoal filter is over
1. Alarm contact signal is not set
2. Alarm contact relay failure
8. Troubleshooting
Corrective action
1. Apply power
2. Replace the fuse
1. Connect the sensor connector securely
2. Replace the sensor
1. Use within the specified pressure range
2. Recalibration
3. Replace the sensor
4. Replace the activated carbon filter
1. Use within the specified pressure range
2. Clean the sensor head
1. Use within the specified temperature range
2. Use within the specified pressure range
3. Specified accuracy cannot be expected in
measurement
4. Reinstall the sensor following procedure
as in Section 3.1
5. Replace the activated carbon filter
1. Replace the sensor
2. Use within the specified pressure range
1. Use proper calibration gas
2. Replace the sensor
3. Recalibrate within the specified pressure
range
4. Replace activated charcoal filter
1. Set the alarm contact signal properly
2. Contact Yokogawa
T801E.EPS
8-1
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