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Dissolved Oxygen Analyzer Aqualyzer® 9061C
Troubleshooting and Technical Questions

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Technical Service
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PROBLEM   POSSIBLE CAUSE   SOLUTION
Calibration Fail (CF)   POOR (low) sensor output.   Check probe handle assembly connection and other connections to sensor.
Calibration Fail (CF)   Sensor not exposed to air.   Make sure sensor is either removed and exposed to air or the flowcell is drained to expose it to air during CAL.
Calibration Fail (CF)   POOR (high) sensor output.   New sensor – needs to rinse down. Let sensor run on sample for 1 hour – repeat calibration.
Calibration Fail (CF)   POOR (low) sensor output.   Check probe handle assembly connection and other connections to sensor.
Readings are not accurate – too low   Poor sensor performance. Bad calibration. Bad thermistor.   Replace sensor. Check CAL log and run another CAL if last result is not good. Verify temperature as indicated on analyzer.
Readings are not accurate – too high   Poor sensor performance. Bad calibration. Dissolved Oxygen leak in sample system. Bad thermistor.   Let sensor run on sample water for 1-2 hours; then run another CAL. Replace sensor. Check CAL log and run another CAL if results are not good. Bench test sample water. Check temperature.
Readings are not accurate – too high   Defective probe handle assembly. Moisture in probe handle assembly.   Measure resistance of probe handle assembly. Verify there is no voltage (mV) generated by a galvanic reaction in handle assembly.
Readings are not accurate – too low   Defective probe handle assembly. High resistance in assembly or corrosion on mating pins.   Replace probe handle assembly.
Current outputs (4-20mA) not functioning correctly   Disconnected wiring at transmitter or along wire path. DCS/recording system not set up properly. Bad CPU board.   Check output set-up to make sure values are entered properly. Run Diagnostics – O/Pma Check cycle and check output coming from transmitter. Replace CPU board.
Alarms not functioning correctly   Disconnected wiring at transmitter or along wire path. DCS/recording system not set up properly. Bad DIO board.   Check alarm set-up to make sure values are entered properly. Run Diagnostics – Relay Check cycle and check alarm output directly from transmitter. Replace DIO board if output is not correct.
Display read "HOT"   Sample temperature over specified range (>131F). Faulty thermistor   Check sample temperature. Clean/replace thermistor.
Display read "TEMP"   No thermistor response.   Clean/replace thermistor. Check thermistor connection on card.
Display read "OVR"   Signal from sensor too high – sample concentration over maximum range (>20ppm)   Check sample concentration. Check sensor connections.