AELC conductivity level switches monitor conductive liquids in tanks and boilers. With no moving parts, they can be used with viscous liquids or media containing solid particles when suitable for the selected electrode.

As liquid reaches or leaves the insulated electrode, the AC conduction path changes. A relay circuit evaluates the signal for level control. The range includes AELC09, AELC09F and AELC20F. Applications include booster systems, boiler-water level control and conductive-liquid tanks; versions support high-temperature service.