Decommissioning; Repair - ProMinent DULCOTEST PAA 1-mA-200 ppm Operating Instructions Manual

Decommissioning / Repair

Decommissioning

the measuring cell
44
11 Decommissioning
CAUTION
• Before removing the measuring cell, switch off any peri-
pheral control equipment completely or switch to manual
operation. When the measuring cell is deactivated, an
incorrect measured value can occur on starting the control/
measuring equipment and can lead to uncontrolled
metering in a control system.
• De-pressurise the system when removing the measuring
cell! To do this you should close the stop valve in front of
and behind the in-line probe housing. If the measuring cell
is removed under pressure, liquid could leak out.
• In an emergency, cut the power supply to the controller! In
case any liquid leaks out of the in-line probe housing (DGM/
DLG III), close the inlet and outlet stop valves as installed by
the customer.
• Before opening the DGM/DLG III, observe the safety instruc-
tions in the system operating instructions!
• You should also observe the safety instructions in section
6 assembly.
Disconnect the measuring cell from the power supply (see sec-
tion 7 installation).
De-pressurise the in-line probe housing.
Loosen the locking screw on the in-line probe housing.
Slowly remove the measuring cell from the in-line probe housing.
Unscrew and empty the diaphragm cap over a washbasin, or
similar.
Thoroughly rinse the electrodes and diaphragm cap with clean,
warm water so no electrolyte deposits remain, then leave to dry.
Gently unscrew the diaphragm cap in order to protect the elec-
trodes.
12

Repair

The measuring cell can only be repaired in the factory. You should
therefore return it in its original packaging. Prepare the measuring
cell for this beforehand (as described in section 11 decommis-
sioning).
ProMinent ®