ProMinent DULCOTEST PAA 1-mA-200 ppm, Руководство по эксплуатации, Страница: 42 / 100

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Pr o Minent ®
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
o C and constant
c) Flow 20 - 100 l/h
You can use the measuring cell simulator (DULCOMETER ® simulator
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.
Fault Possible cause Solution
Measuring cell cannot be 1) running-in time too short See section 8.1 running-in time
calibrated and measured 2) diaphragm cap damaged Change diaphragm cap;
value of the measuring cell is run in the measuring cell,
greater than the reference calibrate (see sect. 6, 8.1, 8.2)
measurement 3) short circuit in the Locate the short circuit and
signal cable remove
Measuring cell cannot be 1) running-in time too short See section 8.1 running-in time
calibrated and measured 2) coating/deposits on Clean or change diaphragm
value of the measuring cell is the diaphragm cap cap (see sect. 6);
smaller than the reference run in the measuring cell (see
measurement sect. 8.1)
calibrate (see sect. 8.2)
3) no sample water flow Correct the flow (see sect. 14
technical data)
4) air bubbles outside Increase the flow within the
on the diaphragm permitted levels
5) harmful substances Consult ProMinent
in sample water
Troubleshooting
BA_DT_097_10_08_4spr.p65 09.10.2008, 13:19 Uhr 42