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<4. Troubleshooting>
4-1
IM 11M10A01-01E
4. Troubleshooting
Possible abnormal symptoms, and corresponding problem sources, are shown in the table
below.
Abnormal symptom Problem source Corrective action
No display 1. Check AC power.
2. Fuse blown.
1. Connect power.
2. Consult Yokogawa rep.
FAIL lamp lit 1. Bad sensor connection.
2. Sensor heater open circuit.
1. Connect securely.
2. Replace sensor.
Low value displayed
High value displayed
1. Was instrument calibrated?
2. Sensor bad.
1. Recalibrate.
2. Replace sensor.
Slow response 1. Negative pressure around sensor.
2. Holes in sensor clogged.
1. Use within the specified pressure
range.
2. Clean probe tip.
Large errors 1. Temperature out of range.
2. High pressure, or negative pressure
around sensor.
3. Oxidation-reduction or high
concentration of corrosive gas.
1. Measure within rated. temperature
2. Measure at near atmospheric
pressure.
3. Can't measure to rated accuracy.
Display fluctuates on high side 1. Sensor bad. 1. Change sensor.
Calibration 1
Can' t calibrate
1. CAL gas oxygen concen-tration too
high or too low.
2. Sensor bad.
1. Use clean atmospheric air.
2. Replace sensor.
Calibration 2
Can' t calibrate
1. CAL gas oxygen concentration too
high or too low.
2. Sensor bad.
1. Use specified (1000 +/- 100 ppm
O
2
/N
2
) calibration gas.
2. Change sensor.
Alarm doesn't work 1. Check if set
2. Relay bad
1. Set again
2. Consult Yokogawa rep.
4th Edition : Oct. 23, 2019-00