Grundfos AquaCel AQC-D3, Инструкция по установке и эксплуатации

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English (GB)
21
13.5 Fault finding chart
Caution
Observe the installation and operating
instructions of the measuring amplifier and
controller!
Fault Cause Remedy
1. No display.
No electricity supply to
the measuring cell.
a) A disinfection or oxidation agent is missing in
sample water.
Check the concentration by making a reference
measurement. Check the dosing units, and
activate dosing. Check the settings of the
measuring amplifier.
b) The electrode cable connection is interrupted. Remake the connection. Replace damaged
cables.
c) No or too low sample water flow rate. Clean the filter, check the flow rate, and check
the sample water inlet pressure.
d) The measuring electrodes are faulty. Replace the measuring electrode.
e) The measuring electrodes are contaminated or
made passive by deposits.
Dismantle, clean or replace the measuring
electrode.
2. The measured value is
lower than the reference
measurement.
a) The measuring electrodes are faulty. Replace the measuring electrode.
b) The measuring electrodes are contaminated or
made passive by deposits.
Remove, clean or replace the measuring
electrode.
c) The temperature has fallen since the calibration. Recalibrate. Activate the automatic temperature
compensation, where applicable.
d) The system has run too short time prior to
calibration.
Let the system run for at least two hours, and
recalibrate.
e) Unsuitable chlorination agent. Only use chlorine solutions such as chloric gas,
sodium hypchlorite and chlorinated lime. Do not
use organic products such as trichlorine
isocyanic acid, as these cannot be measured if
this procedure is used.
f) Incorrect photometric reference measurement
during calibration. Check the reference measurement , and take
another measurement. Repeat the calibration.
g) The pH value for the chlorine measurement has
risen since the calibration.
Keep the pH value constant. Recalibrate.
Activate the pH value compensation.
h) The quantity of sample water is set too low. Check and set the quantity of sample water.
Check the filter, and clean it, if necessary.
i) The cleaning wing is blocked. Fit the cleaning wing correctly.
3. The measured value is
higher than the reference
measurement.
a) The temperature has risen since the calibration. Recalibrate. Activate the automatic temperature
compensation.
b) The pH value for the chlorine measurement has
fallen since the calibration.
Keep the pH value constant. Recalibrate.
Activate the pH value compensation, where
applicable.
c) Interference by other oxidation agents in the
sample water.
Analyse the sample water. Check the chemicals
used.
4. The measured value is
unstable.
a) Interferences on the signal lines. Check the screen and the connections to the
amplifier.
b) The reference electrode diaphragm is blocked. Clean the diaphragm (on the side at the bottom
of the reference electrode) using diluted
hydrochloric acid (10 %). Replace the reference
electrode, if necessary.
c) The measuring electrode is contaminated or faulty. Clean the measuring electrode using a diluted
abrasive cleaning agent. Replace the measuring
electrode, if necessary.
d) The filter is contaminated, and the quantity of
sample water is therefore too low.
Check the filter, and clean it, if necessary.
e) Siphon effect at the sample water outlet. Ensure a flow of sample water with no
counter-pressure.