ProMinent DULCOTEST PER 1-mA-50 ppm Mode D'emploi page 40

Troubleshooting
Fault
Sensor measured
value is 0 ppm
Sensor measured
value is 0 ppm and error
message appears at the
®
DULCOMETER D1C
controller "H2O2 input < 3 mA" 3) Defective sensor
Sensor measured
value is 0 ppm and measuring
cell current is between 3.0
and 4.0 mA**
Error message at
®
DULCOMETER D1C
controller "H2O2 input > 23 mA"
Sensor measured
value is unstable
* If the reference electrode has a silvery sheen or looks white, it needs to be regenerated.
Brownish-grey discolouration is however normal.
** To isolate faults, the current in the sensor can be displayed via the DULCOMETER
D1C whilst the latter is electrically connected to the sensor.
For this purpose read the value in "zero point" in the setting menu "H
complete operation menu, see operating instructions DULCOMETER
confirm by pressing the Enter key, but exit the menu using the Back key.
40
Possible cause
6) Coating/deposits (mangan-
ese, iron oxide) at the
diaphragm cap
No electrolyte in the
diaphragm cap
1) Sensor connected
to controller with incorrect
polarity
2) Signal cable broken
4) Defective control equipment
1) Running-in time too short
2) Defective reference
electrode*
1) H O content exceeds
2 2
upper limit of measuring
range
2) Defective sensor
1) Defective reference
electrode*
2) Process-related
Remedy
Clean or change diaphragm
cap (see sect. 6);
run in the sensor (see
sect. 8.1),
calibrate (see sect. 8.2)
Use new diaphragm cap and
fill in new electrolyte (see
Chap. 6 Mounting, Chap. 8.1
Running-in Period, and
Chap. 8.2 Calibration)
Connect the sensor
correctly to the controller
(see sect. 7)
Change signal cable
Return the sensor
Check the control equipment
with sensor simulator
(DULCOMETER ® Simulator,
order no.1004042),
return if defective
See section 8.1 running-in
time
Return the sensor
for regeneration
Check system, remedy the
defect repeat calibration
(see sect. 8.2)
Return the sensor
Return the sensor for
regeneration
Optimise control process
®
O calibration" in the
2 2
®
D1C, Section 8. Do not
ProMinent ®