The Omron 61F-GP-N8H AC24 is a conductive level controller from the 61F series, configured for High/Low Level detection. It operates on 24VAC and outputs via a SPDT relay (2 Form C) rated at 3A @ 250VAC. Sensitivity is adjustable between 15kOhm and 70kOhm, and the control-to-sensor distance can reach 50m.
The 15kOhm to 70kOhm sensitivity range lets you tune the detection threshold for the conductivity of your process fluid — lower resistance for conductive liquids like water, higher for less conductive media. That 50m max sensor distance means the controller can sit in a central panel while the probes are out at the tank, as long as the cable run stays under 50m. The SPDT (2 Form C) relay gives you one normally-open and one normally-closed contact per pole — useful for driving both a pump and an alarm from the same level event. The 3A @ 250VAC contact rating handles small contactors or pilot lights directly; for larger loads, interpose a contactor. Socketable with an 8-pin octal base means replacement takes seconds — pull the old unit, plug in the new one. No rewiring, no downtime beyond the swap.