Conductive level switch
max. 30 bar, max. 150 °C | NES
KOBOLD INSTRUMENTATION
Description
KOBOLD limit switches of model NES are used for level
monitoring and pump control of conductive liquids. The de-
sign without any moving parts allows service with critical
media with, for example, solid content, negligible density or
high viscosity. The instruments operate on the conductive
principle. A low a.c. voltage is applied between the con-
ductive wall of the tank or the earth electrode (longest
electrode) and a switching point electrode. If the conductive
medium touches the electrodes, a negligible alternating
current flows across the electrodes and the conductive
medium to the electrode relay. The relay amplifies the alter-
nating current and operates an relay or a pump controller. An
electrode relay of type NE-104 is required per switch point
for signalling. For min./max. control two switching point
electrodes must be connected to the relay. Relay NE-304
operates as two single relays (NE-104).
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