The Omron 61F-G2NL AC110/220 2KM is a conductive level controller from the 61F series, wired for high/low level detection with two SPDT relay outputs. It runs on 110/220VAC supply and handles sensor runs up to 2 km — that distance rating means you can place the controller in a central panel and run probes out to remote tanks without signal loss, which saves running a separate panel per vessel.
Sensitivity is adjustable from 0 to 1.8 kOhm — that's the resistance threshold between the probe electrodes. For clean water or weak conductive liquids, you dial it down; for slurries or higher-resistance fluids, you open it up. The 3 A contact rating at 200 VAC on the SPDT relays is enough to drive a small contactor or alarm beacon directly; anything larger needs an interposing relay. Screw terminals and DIN-rail mounting mean a straightforward panel install — strip, terminate, snap on.