Hach POLYMETRON 8810 User Manual page 37

Malfunction
No analysis results
Measurement cell dirty
Results drift
Measurement cell clean
Stable results with incorrect values
No display on the screen
Maintenance and Troubleshooting
Possible cause
Sample flow or no sample
flow in the measurement cell
Electrode connections
Programming
Analog outputs
Chemical cleaning
Sample conditioning
Conditioning reagents
Automatic calibration
Automatic calibration
Analog outputs
Mains power
Corrective action
Check sample flow > 40 L/minute
Check air pressure 4 - 7 bars
Check the valves are working
Check all electrode connections
Check measurement cycle
parameters
Check the sample conditioning
parameters
Check measurement sequence
parameters
Check the analog outputs
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
Check the quality of the sample
conditioning solution
Check the sample conditioning
parameters
Check the quality of the sample
conditioning solution
Increase the frequency of
calibrations
Check the automatic calibration
system for air bubbles, tube
connections, etc.
Calibrate the system
Check the automatic calibration
parameters
Check analog output parameters
Check or change the fuse:
220/240 V - 630 mA
110 V - 1.25 A
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