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Fault
Display of reading shows
"""zero"""
Reading display unsteady Air bubbles on the outside of the mem‐
Troubleshooting / Maintenance: When you have tried everything: Check whether the reference elec‐
trode at the end of the electrode shaft is silvery-white instead of brownish-grey. It is then worn out
and can be replaced by ProMinent.
Possible cause
Tensides in the water (membrane is
transparent!)
pH value > pH 8.0
No electrolyte in the membrane cap
Electrolyte pushed out by gas bubbles in
the sample water
Only bonded chlorine present
Chlorine content below the lower limit of
the measuring range
Sensor incorrectly connected to the con‐
troller
Run-in time too short
Sensor defective
brane
Membrane damaged
Reason lies with control device
Troubleshooting
Remedy
Remove tensides and
replace membrane cap;
allow the sensor to run in
and calibrate, possibly
use a CDP sensor
Lower pH value (pH
5.5-8.0)
Fill with new electrolyte
Ä further information on page 39
Contact ProMinent
If chloramine is present
(DPD 4 test) then perform
shock chlorination or
replace the water
Add chlorine and then
repeat calibration or use
a suitable sensor
Connect the sensor cor‐
rectly to the controller
Allow to run-in for 3 hours
Replace sensor
Remove air bubbles by
tapping and increase flow
rate if necessary
Replace membrane cap,
allow sensor to run in,
calibrate
Eliminate cause
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