The Model J52 Refrigerant Level Switches are float actuated units designed for use on liquids with 0.60 specific gravity and above.

A permanent magnet is attached to a pivoted switch actuator.

As the float/displacer rises following the liquid level, it raises the attraction sleeve into the field of the magnet, which then snaps against the non-magnetic enclosing tube, actuating the switch.

The enclosing tube provides a static pressure boundary between the switch mechanism and the process. On a falling level, the float/displacer deactivates the switch.

The buoyancy force of a process liquid on the float causes the float to ride on the liquid surface.

The movement of the float with the liquid level moves an attraction sleeve into the field of the switch magnet, pulling the magnet toward the sleeve and actuating the switch.