OPERATION MANUAL
Technical changes reserved
0141 0316-112 31.08.2020
Level controller for conducting liquits
WLS-GEH230V
3.5
Connection of user‘s own sensors
!
The following details are useful for persons with adequate knowledge of the associated electronics. The applicable safety regulations shall be duly
followed! Connection and mounting operations shall be carried out only after switching off the voltage supply.
The following instructions help in connection of your own sensors at the input socket of electronics. However, this certainly needs necessary atten
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tion as operating voltage is present at the socket also. Sometimes, wrong connection may lead to damage of the components or result in failure
of the module itself.
!
Touching the electronic components in switched off condition should also be avoided. Electronic components can get damaged due to electrosta
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tic discharge process. ESD protection measures should be duly observed!
3.5.1
Pin configuration of input socket (RJ12)
Pin Function
Colour
(6 core cable)
Discription
1
UB
15 V
2
E 4
Grey
Level 4 (E4), highest
3
E 3
Yellow
Level 3 (E3)
4
E 2
Green
Level 2 (E2)
5
E 1
Brown
Level 1 (E1), lowest
6
COM
White
Reference electrode
3.6
Construction of sensor
The sensor can be constructed in various ways:
In plastic containers, the electrodes can be fitted in pairs on the container wall. Each pair always consists of a reference electrode and a sensing
electrode, which are placed at a distance of approx. 5-15 cm from each other. For liquids of high conductivity, just one electrode at the bottom of
the container is also good enough. The reference electrodes are connected together to the terminal COM. Due to contamination deposits on the
container walls with time, such constructions are probably not maintenance free. The wall area between the electrodes should be periodically
cleaned.
View of contacts
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