The Omron 61F-G3H AC100/200 is a conductive level controller from the 61F series, configured as a High/Low type with alarm outputs. It operates on a 100/200VAC supply and provides three relay outputs in an SPDT (2 Form C) contact arrangement, rated at 5A @ 220VAC. The sensitivity adjustment spans 15kOhm to 70kOhm, and the control unit can be mounted up to 50 meters from the sensing electrodes.
The 15kOhm to 70kOhm sensitivity range determines the conductivity threshold at which the relay switches — useful for differentiating between liquids (e.g., water vs. oil) or detecting foam layers. The 50m maximum distance between controller and sensor gives flexibility for tank-side mounting away from the vessel. The SPDT (2 Form C) contacts allow independent high and low alarm circuits plus a common, simplifying panel wiring for pump control or overflow prevention.