The Omron K7L-AT50 is a liquid leakage sensor from the K7L series, delivering an open collector output when it detects the presence of liquid. It ships in bulk packaging and is designed for installation in panels or equipment where early warning of coolant, water, or process fluid leaks is needed — common in industrial automation, HVAC chiller plants, data-center underfloor monitoring, and machine-tool coolant systems.
The open collector output sinks current when active. You supply the pull-up voltage and load resistor to your PLC digital input or relay coil.
That means you can plan this into a BOM without obsolescence risk for the foreseeable future.
Application fit — liquid detection in the field
This is a dedicated liquid leakage sensor, not a photoelectric or proximity device. It detects the presence of conductive or non-conductive liquids (depending on the probe type used with the K7L controller) and signals via the open collector. Typical deployment: mount the sensor head at low points in drip trays, along pipe runs, or under pumps. The bulk package means it ships loose — plan for your own strain relief and terminal connections at the panel.