Malfunction Possible cause Corrective action
No analysis results
Sample flow or no sample
flow in the measurement cell
Check sample flow > 40 L/minute
Check air pressure 4 - 7 bars
Check the valves are working
Electrode connections Check all electrode connections
Programming
Check measurement cycle
parameters
Check the sample conditioning
parameters
Check measurement sequence
parameters
Analog outputs Check the analog outputs
Results drift
Measurement cell dirty
Chemical cleaning
Check the level and quality of the
chemical cleaning solution
Check all the sample conditioning
solution tubes
Check the cleaning parameters
Check valves are not leaking
Check all tubing for any constriction
Sample conditioning
Check the quality of the sample
conditioning solution
Check the sample conditioning
parameters
Measurement cell clean
Conditioning reagents
Check the quality of the sample
conditioning solution
Automatic calibration
Increase the frequency of
calibrations
Stable results with incorrect values
Automatic calibration
Check the automatic calibration
system for air bubbles, tube
connections, etc.
Calibrate the system
Check the automatic calibration
parameters
Analog outputs Check analog output parameters
No display on the screen Mains power
Check or change the fuse:
220/240 V - 630 mA
110 V - 1.25 A
Maintenance and Troubleshooting
35
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