The Omron 61F-GP-NH AC200 is a High/Low Level controller from the 61F series, designed for conductive liquid level detection in tanks, reservoirs, and process vessels. It operates on a 200VAC supply and provides SPDT relay output (2 Form C) rated at 3A @ 250VAC — enough to drive a small pump contactor or alarm circuit directly. The sensitivity range of 10kOhm ~ 40kOhm means it triggers on the conductivity of the liquid between the electrode and common probe — typical for water, wastewater, and mild chemical solutions. The 50m maximum distance between controller and sensor allows the electronics to be panel-mounted while the probes sit at the tank. Termination is via an 11-pin octal plug-in base (socketable), which simplifies replacement without rewiring the panel.
If your customer's AVL or AML locks you to the 61F-GP-NH AC200, a deviation request may be needed before substituting. For new designs or where the AML allows flexibility, the 61F series has later-generation controllers that share the same 11-pin octal footprint and sensitivity range — verify the supply voltage and output configuration against your application before specifying an alternate.
Integration Notes
Socketable mounting on an 11-pin octal base means the controller plugs into a pre-wired socket on the DIN rail or panel — no direct wiring to the unit, so a swap takes under a minute. The 200VAC supply is single-phase line voltage; confirm your control transformer or panel supply matches before energizing. The SPDT relay contacts are rated for 3A at 250VAC resistive. For inductive loads like a contactor coil or small motor starter, derate per the manufacturer's curve or add a snubber across the load. The sensitivity adjustment (10k-40kOhm) is set via the front-panel potentiometer — calibrate with the actual process liquid to avoid false trips or missed levels.