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MN301520 Rev A1
Getting Started
Step Four
FEATURES OF A DUAL INPUT AUTOMATIC FILL/EMPTY RELAY:
The Dual Input Automatic Fill/Empty Relay (LC41 and LC42 series only) is designed to receive signals from
two liquid sensors. It turns its internal relay ON or OFF (as set by the invert switch) in response to the
presence of liquid on both sensors, and changes the relay status back again when both sensors are dry.
Automatic Empty:
Latch is ON & Invert is OFF. Relay will energize when level reaches high switch (both switches are wet).
Relay will de-energize when level is below the bottom switch (both switches are dry).
Automatic Fill:
Latch is ON & Invert is ON. Relay will energize when level is below the bottom switch (both switches are dry).
Relay will de-energize when level reaches high switch (both switches are wet).
The Dual Input Automatic Fill/Empty Relay may be used with almost any kind of sensor signal: current sensing
or contact closure. The relay is a single pole, double throw type; the controlled device can be connected to
either the normally open or normally closed side of the relay. A time delay from 0 to 60 seconds can be set
before the relay responds to the sensor input. Typical applications for Dual Input Relays are automatic filling
(starting fill pump at a low level and stopping pump at a high level) or automatic emptying operations (opening
a drain valve at a high level and closing valve at low level).