pH/chlorine regulator AUTODOS 5000 - 2005-01-21
Eng_Autodos5000.doc ver 3.2 - page 35
9. Fault Finding
FAULT
PROBABLE CAUSE
REMEDY
Controller completely dead.
No supply voltage.
Check the electrical supply.
Incorrect monitored values of pH.
1.Electrode not connected.
2.Broken connections.
3.Contaminated electrode
4.No test water.
5.Incorrect calibration.
1.Check the connections.
2.Check the cable.
3.Clean the electrode.
4.Check the flow cell.
5.Re-calibrate with fresh buffer
solution.
Impossible to calibrate.
1.Faulty electrode.
2. Bad electrical connections.
1.Check the electrode for bubbles and
replace if not correctable.
2.Check the cables even those
connecting the cable connector to the
PCB.
Electrode is incorrect when monitoring,
gives a correct value with a buffer
solution but has a slow reaction.
1.Contaminated electrode.
2.Spent electrode.
1.Clean the electrode.
2.Replace the electrode.
Monitored value fixed at pH7 or 0ppm.
Monitor signal is short circuited.
Check electrode, cables and
Connections.
No dosing despite requirement.
Dosing LED not lit or AUTO LED is
blinking
1.Controller not set to AUTO.
2.’PHF’ failure
1.Set the controller to AUTO.
2.Check the reason and RESET, the
dosing starts when pH is correct.
No dosing despite AUTO requirement.
Dosing LED is lit.
Dosing equipment incorrectly connected. Check the connections.
No "click sound" when dosing.
Dosing LED is lit.
Faulty dosing relay.
Return the unit for repair.
Incorrect chlorine measurements
(Prominent measuring cell).
1.Air bubbles on the membrane.
2.Contaminated membrane.
3.Pressure difference.
4.Unstable pH value.
5.Incorrect calibration.
1.Lightly tap the electrode container or
temporarily increase the water flow
past the cell.
2.Clean the membrane and fill with
fresh electrolyte.
3.Ensure that the flow cell outlet is not
pressurised
4.pH value must be stabilised, adjust to
7.2.
5.Perform a chlorine calibration.
Incorrect chlorine measurements
(PB-100 measuring cell).
1. Insufficient water flow.
2. Unstable pH value
3. Contaminated copper electrode (low
signal).
4. Incorrect calibration.
1. Adjust the water flow.
2. Control pH channel.
3. Polish the electrode with a suitable
fine abrasive.
4. Calibrate.
Monitored chlorine value too low to
adjust to measured value.
1.Poor electrolyte.
2.Meter cell gold tip is oxidised.
1.Replace electrolyte, clean the cell
gold tip with a paper serviette.
2.Polish very carefully with a suitable
fine abrasive.