ProMinent DULCOTEST CDR 1-mA-2 ppm Betriebsanleitung Seite 55

Fault
Measured value display
unsteady.
When you have tried everything: Check whether the reference electrode at the end of the elec‐
trode shaft is silvery-white instead of brownish-grey. The reference electrode is then worn out and
can be replaced by ProMinent.
Possible cause
ClO content below the lower
2
measuring range limit.
Sensor incorrectly connected
to the controller.
Run in period too short.
Sensor faulty.
Air bubbles on the outside of
the diaphragm.
Diaphragm damaged.
Cause lies in the control
device.
Troubleshooting
Remedy
Add ClO and then repeat calibration
2
and/or use a suitable sensor.
Connect the sensor correctly to the
controller.
Allow to run-in for 3 hours.
Replace sensor.
Remove air bubbles by tapping them
and increase flow rate if necessary.
Replace diaphragm cap, allow sensor
to run in, calibrate it.
Eliminate cause
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