The Omron 61F-G1P/AC100 is a High/Low level controller from the 61F series, designed to monitor conductive liquid levels and switch a relay when the level crosses a set point. It operates on a 100VAC supply and outputs through a SPDT relay contact rated at 5A at 200VAC. The sensitivity is adjustable from 0 to 4kOhm, which means it can detect liquids with a wide range of conductivity — from relatively pure water to more conductive process fluids. The 1km maximum distance between the controller and the remote sensor electrodes gives flexibility for large tanks or remote sumps. Socketable mounting (15-pin octal base) and plug-in termination mean the controller can be swapped without rewiring — a practical advantage for MRO spares where downtime matters. The SPDT (2 Form C) contact provides both normally-open and normally-closed outputs, so it can drive an alarm and a pump fill/empty circuit from a single unit.
Deployment context
This controller is typically socketed onto a DIN-rail or panel-mount octal relay base inside a control cabinet. The 1km sensor distance suits applications like water towers, wastewater lift stations, or chemical batching tanks where the controller sits in a central panel and the electrodes are field-run. The alarm low contact and idling prevention features are built-in logic for fail-safe low-level detection and pump dry-run protection.