MN301520 Rev A1
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Getting Started
Step Four
FEATURES OF A SINGLE INPUT HIGH OR LOW RELAY:
Single Input Relays (LC40 series, LC41 series with latch turned OFF and LC42 series) are designed to receive
a signal from a single liquid sensor. It turns its internal relay ON or OFF (as set by the invert switch) in
response to the presence of liquid, and changes the relay status back again when the sensor is dry.
High Alarm:
Invert is OFF. Relay will energize when the switch becomes Wet and will de-energize when the switch
becomes Dry (out of liquid).
Low Alarm:
Invert is ON. Relay will energize when the switch becomes Dry (out of liquid) and will de-energize when the
switch becomes Wet.
Single Input Relays 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 Single Input Relays are high level or low level
switch/alarm operations (opening a drain valve whenever liquid level rises to a sensor point) and leak detection
(sounding an alarm when a leak is detected, etc.).