Level
Relay
NR 430-type level relays have
a hysteresis behavior which allows to control two switch
points (e.g. tank full-empty) in connection with a 3-rod
electrode. With 2-rod electrodes, one filling level
can be controlled. For this purpose, the level relay
applies a physically separated a.c. voltage to two outputs
(e.g. 20V, AC).
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