DEPOLOX® 400 M
6. Operation
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DPD calibration ?
Slope error
The current difference required
for span alignment over the entire
measurement range was less than
the minimum value.
Range: Minimum current diffe-
rence
Check DES sensor.
Clean electrodes.
Check the pH value of the water
(< pH 8).
Organic chlorine compound (e. g.
chlorine stabilizer chloroisocyanu-
rate) in the water.
Do not add any chlorine stabilizers
to the water.
Disinfection sensor (DES sensor):
Slope error - the sensor current
based on 1 mg/l has fallen below
the required minimum.
Carry out DES sensor mainte-
nance, replenish cleaning sand.
pH7 calibration ?
pHX calibration ?
Calibration ?
Offset calibration ?
pH:
In pH 7 calibration, the sensor sig-
nal is outside the range -100 to
+100 mV or the sensor issues a
signal outside the range 46 to 70
Check the electrode.
Check buffer solutions, replace if
necessary.
mV per pH increment, the cali-
bration point distance is smaller
than 1 pH increment.
Factory calibration ? Hardware or electronic error
Contact Service.
Setpoint ?
Due to modification of the measu-
rement range, the controller set-
point is outside the range.
Reset the controller setpoint or
adjust the measurement range.
Limit value ?
Due to modification of the measu-
rement range, the limit value is
outside the range.
Reset the limit value or adjust the
measurement range.
Temperature error ?
Interruption in the temperature
sensor or cable of the multi-sen-
sor.
Check multi-sensor and cable.
mA Output 1 ?
mA Output 2 ?
mA Output 3 ?
mA Output 4 ?
Load error
The mA output cannot drive its
mA output current through the
connected current loop (500 ohm
at 20 mA max.).
Check whether the mA signal is
required at all (e.g. for plotter). If
not, switch off the output signal in
the “INPUTS/OUTPUTS” menu,
“Analog output.”
Check mA signal cable for inter-
ruption.
Hardware ?
Hardware or electronic error
Contact Service.
Data storage ?
Hardware or electronic error
Contact Service.
Cell ?
Disinfection sensor (DES sensor):
Chlorine sensor not screwed in.
No sand cleaning. Sensor, sensor
cable or sensor measuring module
defective. Sensor measuring
module µA measuring range
exceeded.
Screw in DES sensor correctly.
Check sand cleaning.
Check the sensor, sensor cable or
sensor measuring module, replace
if necessary.
Select higher µA measurement
range.
pH and fluoride sensor:
Sensor, sensor cable or sensor
measuring module defective.
Check the sensor, sensor cable
and sensor measuring module,
replace if necessary.
Error message
Cause
Remedy