Troubleshooting - ProMinent DULCOTEST PAA 1-mA-200 ppm Operating Instructions Manual

Troubleshooting

Fault
Measuring cell cannot be
calibrated and measured
value of the measuring cell is
greater than the reference
measurement
Measuring cell cannot be
calibrated and measured
value of the measuring cell is
smaller than the reference
measurement
42
10 Troubleshooting
You must look at the entire measurement station in order to locate
any faults. This consists of (see fig. 2)
1) Measuring/control equipment
2) Electrical cable and connections
3) In-line probe housing and hydraulic connections
4) Measuring cell
Possible causes for faults shown in the table below mainly refer to
the measuring cell. 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) Peracetic acid content in accordance with the area of
measurement
b) Sample water temperature 5 - 45
c) Flow 20 - 100 l/h
You can use the measuring cell simulator (DULCOMETER
order no. 1004042) to locate the fault in the measuring and control
system. The operating instructions manual for the DULCOMETER
D1C measured value peracetic acid gives full details on how to
locate a fault in the measuring and control equipment.
Where there are large discrepancies between the measured values
of the measuring cells 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
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
Solution
See section 8.1 running-in time
Change diaphragm cap;
run in the measuring cell,
calibrate (see sect. 6, 8.1, 8.2)
Locate the short circuit and
remove
See section 8.1 running-in time
Clean or change diaphragm
cap (see sect. 6);
run in the measuring cell (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
ProMinent
®
simulator
®
®