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Dissolved Oxygen Analyzer Aqualyzer® 9061
Troubleshooting and Technical Questions

9061 Dissolved Oxygen Analyzer spare parts Spare Parts
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Technical Service
Please call 800-242-7353 or 908-534-5100 and select option 2
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PROBLEM   POSSIBLE CAUSE   SOLUTION
Calibration Fail (CF)   Faulty Solenoid Valve   Run Solenoid Check cycle in Diagnostics – check status and connections of solenoid valve. Verify operation of valve by removing sensor from flowcell and perform another CAL with sensor exposed to atmosphere.
Calibration Fail (CF)   POOR (low) sensor output.   Check probe handle assembly connection and other connections to sensor.
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.   Old/bad sensor. Replace 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.