Section 7 Troubleshooting - Hach 8362sc User Manual

Section 7
Symptom
The electrode does not
calibrate.
The readings are erratic.
The response is slow.
Short term drift in the pH
reading.
Troubleshooting
Table 5 General Troubleshooting
Probable Cause
Bad measuring or reference electrode.
The wiring to the controller is incorrect.
The controller is defective.
Air in the sample line.
Electrode grounded improperly.
The glass bulb is defective.
Streaming potential
The sample is cold and/or of low
ionic strength.
The electrode has insufficient
conditioning.
Corrective Action
Replace defective electrode.
Check the electrode cable to controller wiring. Make
sure the wire connectors are contacting the metal
wires and not the wire insulation.
Replace the controller.
If a pocket of air passes over or gets trapped at the
end of the electrode, the reading becomes
momentarily erratic. This usually is remedied by
reorienting the electrode so that air bubbles do not
block the sensor.
Refer to the sensor user manual for proper
grounding.
Replace the electrode.
Ground the solution near the electrode (especially in
high purity water).
Raise the temperature of the sample.
Condition a new or dry electrode for at least 10 hours
in the process sample. Perform a calibration
after conditioning.
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