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

Fault
Sensor cannot be
calibrated and measured
value of the sensor is
greater than the reference
measurement
Sensor cannot be
calibrated and measured
value of the sensor is
smaller than the reference
measurement
ProMinent ®
10

Troubleshooting

Troubleshooting includes the complete measuring station. This
consists of (see fig. 2)
1) Measuring/control equipment
2) Electrical cable and connections
3) In-line probe housing and hydraulic connections
4) Sensor
Possible causes for faults shown in the table below mainly refer to
the sensor. Before beginning to look for any faults, you should
ensure that all operating instructions have been carried out in
accordance with the Technical data in section 14:
a) H O content in accordance with the measurement range
2 2
b) Sample water temperature 0 - 50
c) Flow rate 20 - 100 l/h
You can use the sensor simulator (DULCOMETER
no. 1004042) to locate the fault in the measuring and control system.
The operating instructions manual for the DULCOMETER
measured value H O
2
the measuring and control equipment.
Where there are major discrepancies between the measured values
of the sensor and the measured value of the reference methods, you
should first consider all possible faults relating to the reference
methods. You should repeat the reference measurement several
times if necessary.
Possible cause
1) Running-in time too short
2) Diaphragm cap damaged
3) Short circuit in the
signal cable
4) Interfering substances
1) Running-in time too short
2) Coating/deposits on
the diaphragm cap
3) No sample water flow
4) Air bubbles outside
on the diaphragm
5) Harmful substances
in sample water
o
C and constant
gives full details on how to locate a fault in
2
Remedy
See section 8.1 running-in time
Change diaphragm cap;
run in the sensor, calibrate
(see sect. 6, 8.1, 8.2)
Locate the short circuit and
remove
Contact ProMinent
See section 8.1 running-in time
Clean or change diaphragm
cap (see sect. 6);
run in the sensor (see sect. 8.1)
calibrate (see sect. 8.2)
Correct the flow (see sect. 14
Technical data)
Increase the flow within the
permitted levels
Consult ProMinent
Troubleshooting
®
simulator order
®
D1C
39