Levalarm® Level Alarms & Controls

How It Works

A stainless steel float attached to a rod containing an encapsulated magnet pivots vertically within the chamber, driving a secondary magnet inside the switch housing. Repelling magnetic fields create a positive interlocking mechanism that is resistant to vibration and thermal effects. As liquid level drops, the float moves downward, shifting the magnets to activate the switch — configurable to open or close on rising or falling level.

Tri-Magnet Switch Operation

A stainless steel float is attached to the end of a rod containing a stainless steel encapsulated magnet. The magnet travels vertically inside the pressure tube. The primary magnet on the float rod drives a secondary magnet, which in turn drives a tertiary magnet mounted to the switch arm to activate the switch mechanism.

As liquid level falls, the float drops and directs the magnets into the opposite position, causing the switch to change state. The use of repelling magnetic fields creates a positive interlocking switch that is unaffected by heat and maintains positive operation over long service periods.

How It Works

A stainless steel float swings at the end of a pivot rod. The rod head carries an Alnico V magnet. The magnet attracts one leg of a U-shaped armature which is attached to a microswitch leaf actuator. A buoyed float holds the switch open or closed, depending on terminals used. As liquid levels fall, the float drops and directs the magnet to the opposite position. A closed switch actuates alarms; an open switch achieves fuel cut-out.

Operation is highly reliable and sensitive because the magnet counterbalances the float, allowing accurate use of the float's buoyancy. The magnet does not "slide," eliminating any friction that could impede movement and accuracy.

Retropak Upgrade Available — Model EA100DRPT

Convert your EA100D float-style level alarm into a probe-style control station without disturbing any boiler piping. Fits EA100 and EA100D models. Installs on boilers, tanks, and water columns — pressures to 800 PSI.

Kit includes: flange cover with T-probe, probe housing kit with ½" conduit connection, replacement flange gasket, 30 ft. 18-gauge Teflon® insulated wire. Relay control sold separately.

How It Works

A stainless steel float swings at the end of a pivot rod. The rod head carries an Alnico V magnet. The magnet attracts one leg of a U-shaped armature which is attached to a microswitch leaf actuator. A buoyed float holds the switch open or closed, depending on terminals used. As liquid levels fall, the float drops and directs the magnet to the opposite position. A closed switch actuates alarms; an open switch achieves fuel cut-out.

Explosion-Proof Variant — Model EA100EPS

The EA100EPS is equipped with a switch housing that meets UL requirements for Class 1, Group D, Division 1 service. In design, materials, and performance, this model is similar to the EA100S. Explosion-proof models are ideally suited for chemical and petroleum field applications.

Retropak Upgrade Available — Model EA100SRPV

Convert your EA100S float-style level alarm into a probe-style control station without disturbing any boiler piping. Fits EA100S and EA100SW models. Installs on boilers, tanks, and water columns — pressures to 800 PSI.

Kit includes: flange cover with V-probe, probe housing kit with ½" conduit connection, replacement flange gasket, 30 ft. 18-gauge Teflon® insulated wire. Relay control sold separately.