Instructions

MANUALS
Technical changes reserved
0141 0316-112 05.2014
Level controller for conducting liquids
WLS-GEH230V
2. Description
2.1 Functional description
The control device is used for regulating level of conducting liquids like supply line water, rain water or condensate. The measurement
of level in the reservoir is done with the help of electrodes, for which either contact surface of the reservoir walls or self made rod type
electrodes can be used.
With two independent circuits, simultaneous monitoring of both minimum and maximum liquid levels and control of two different actuators
are possible, for example, an inlet valve and a pump.
In liquid reservoir, four electrodes (E1..E4) are mounted in the medium, at heights corresponding to the required switching point. A fth
electrode is placed at the bottom of the reservoir (not shown in sketch) which works as the reference electrode.
According to water contact, the ll level is indicated through 4 green LED´s L1 to L4. If the reservoir is completely empty, the red LED glows.
For example, the lower pair of electrodes (E1,E2) can be used to control a lling valve at the inlet. After release of the lowest electrode E1,
the lling valve is switched ON and switched OFF again on wetting of the second electrode E2 (Hysteresis).
For example, the upper pair of electrodes can be used to control a drain valve or a pump. During contact with the topmost electrode E4, the
drain valve is switched ON and again switched OFF after release of the lower electrode E3 (Hysteresis).
The switching behaviour of the system (Filling/Empty) is to be congured over two jumper plugs. The sensitivity of the electrodes can be
adjusted through potentiometers (approx. 15 kΩ... 80 kΩ).
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
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