The Omron 61F-G1NL AC110/220 2KM is a high/low level controller from the 61F series, designed to monitor liquid levels and switch relay outputs based on probe resistance. It accepts a dual-rated 110/220VAC supply, so the same unit works on either line voltage without a jumper change — useful when the panel supply is still being finalized. Two SPDT (2 Form C) relay outputs rated 3A @ 200VAC handle the alarm and pump control logic. The sensitivity adjustment spans 0 to 1.8 kOhm, letting you tune the trip point for conductive liquids with different resistivity — from tap water to mildly conductive process fluids. The headline spec is the 2 km control-to-sensor distance. That means the controller can sit in a central panel while the probe is at a remote tank or sump, as long as the wiring resistance stays under the sensitivity range. For a long cable run, keep the pair twisted and away from power conductors to avoid false trips.
DIN rail mount with screw terminals — standard panel integration. Features include Alarm Low - Contact and Idling Prevention. The idling prevention logic stops the pump from short-cycling when the level is at the boundary — a common failure point in sump and lift-station controls.