ProMinent DULCOTEST PAA 1-mA-200 ppm Operating Instructions Manual page 43

Fault
Measuring cell measured
value is 0 ppm
Measuring cell measured
value is 0 ppm and error
message appears on the
®
DULCOMETER D1C
controller "PES input < 3 mA"
Measuring cell measured
value is 0 ppm and measuring
cell current is between 3.0
and 4.0 mA**
Error message on
DULCOMETER ® D1C
controller "PES input >23 mA"
Measuring cell 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 measuring cell can be displayed via the DULCOMETER
D1C whilst the latter is electrically connected to the measuring cell.
You can read about this in the complete operation menu, see operating instructions manual for
®
DULCOMETER D1C section 8 in the set-up menu "PES calibration" the value under "zero
point". You should then confirm, not with the Enter key, but leave the menu using the Back key.
ProMinent ®
Possible cause
6) coating/deposits (mangan-
ese, iron oxide) on the
diaphragm cap
No electrolyte in the
diaphragm cap
1) measuring cell connected
to controller with incorrect
polarity
2) signal cable broken
3) defective measuring cell
4) defective control equipment
1) running-in time too short
2) defective reference
electrode*
1) PES content exceeds
upper limit of instrument
measuring range
2) defective measuring cell
1) defective reference
electrode*
2) restricted operation
Troubleshooting
Solution
Clean or change diaphragm
cap (see sect. 6);
run in the measuring cell (see
sect. 8.1),
calibrate (see sect. 8.2)
Fill with electrolyte (see sect. 6
assembly, sect. 8.1 running-in
time and sect. 8.2 calibration)
Connect the measuring cell
correctly to the controller
(see sect. 7)
Change signal cable
Return the measuring cell
Check the control equipment
with measuring cell simulator
(DULCOMETER ® Simulator,
order no.1004042),
return if faulty
See section 8.1 running-in
time
Return the measuring cell
for regeneration
Check system, fix the fault,
repeat calibration (see sect.
8.2)
Return the measuring cell
Return the measuring cell for
regeneration
Optimise control operation
®
43