The Omron 61F-G1HN AC110/220 is a Series 61F liquid level controller that operates on 110/220VAC and mounts to a DIN rail inside a panel. It senses conductive liquid levels through electrode probes and switches a relay when the level reaches the set point — a straightforward workhorse for tank fill/drain, sump pump control, or overflow alarm in water/wastewater and process lines.
The 110/220VAC supply is a dual-range input — it accepts either nominal voltage without a jumper change, which simplifies stocking for panels that ship to both 110V and 220V sites. The DIN-rail form factor means it clips directly onto a standard 35 mm rail alongside contactors and relays, keeping the panel layout clean. Series 61F controllers use a conductive sensing method (two or three probes), so the liquid must have some conductivity; it won't work with deionized water or hydrocarbons without an interface relay.