Hach-Lange POLYMETRON 9240 Operator Manual - Manual (Page 116)

114
Troubleshooting
Grab sample is not correct.
Calibration is not correct. See below.
Activation has been skipped. Start a new grab sample again.
Electrode too slow.
Set activation setup to 24 hours frequency.
Manually activate the electrode by immersing it
for 10 minutes in activation solution.
If the problem persists, change the electrode.
Measurement is not correct.
Instrument was not correctly
programmed.
Check programming parameters -
correspondence with the electrode
characteristics.
Electrode not well connected. Check all electrode connections.
Measurement board is defective.
Check measurement board with a voltage
generator. If measure is not correct, change the
measurement board.
System, including electrode, not
properly calibrated. Calibrate the whole system (electrode
connected). Check the calibration solution.
Electrode does not function, may be
incompatibility with the application.
Visually check the electrode and the
correspondence between the application and
the electrode specifications.
CPU board is defective. If error persists, call the Service Technician.
Electrode is too slow.
Check Slope parameter. If Slope higher than 60
mV/decade, or lower than 55 mV/decade, it
may be that the electrode is too slow. Manually
activate the electrode by immersing it for 10
minutes in activation solution.
If the problem persists, change the electrode.
No electrolyte. Refill the electrolyte solution.
Rinsing between each channel is not
correct.
Maximum cycle time is too low (menu CYCLE
TIME).
Flow rate is lower than 5.5 L/h.
Incorrect conditioning.
Verify pH at the outlet of the cell (see minimum
pH for maximum detection limit table). Verify
conditioning reagent level.
Verify if solenoid valve for overflow vessel is
blocked and replace it if needed.
No sample being delivered
Verify if solenoid valve for sample is blocked
and replace it if needed.
Temperature measurement is not
correct.
Conductivity sensor not properly
connected. Check the conductivity sensor is properly
connected. Check it is not defective.
Temperature not calibrated. Calibrate temperature.
Defective measuring board.
If problem cannot be solved, call the Service
Technician.
Calibration parameters are
questionable.
Electrode too slow.
Set activation setup to 24 hours frequency.
Manually activate the electrode by immersing it
for 10 minutes in activation solution.
If the problem persists, change the electrode.
Calibration solution is empty. Refill the calibration canister.
Calibration solution is polluted. Change the calibration solution.
Drain valve cannot open.
Change the valve or call the Service
Technician.
Drain pump is inefficient. Remove it and clean the internal valve.
Analyzer frame is not vertical. Install the analyzer vertically.
Table 11 General Faults
MALFUNCTION POSSIBLE CAUSE REMEDIES