Operating Logic: In the Model NS127 Pump Down) the output relay is de-energized until the liquid reaches the high probe. When liquid touches the high probe, the output relay is activated until the level drops below the low probe.
In Models NS128 and NS143 (Pump Up) the output relay is energized until the liquid reaches the high probe. When the liquid touches the high probe, the output relay is deactivated until the level drops below the low probe.
If the tank is non-conductive, a third (common) probe must be installed at a level where it will always be submerged.
Features:
● 100% functionally tested
● Isolated UL Class ll sensing voltage
● 1/4" male fast-ins for circuit connection
● Conformal coating to protect circuit from harsh environments