LL Switch

Level Switches for Liquid Level Gauge

General Specifications
MLS-3 / MLS-3EX Reed Switch
MLS-9EX Tilt Switch
PS-1 Pneumatic Relay

General Specifications

Babbitt offers three basic types of level switches to meet the various requirements for alarm and control action for liquid level gauges. These switches mount on the chamber of a level gauge. All are non-invasive switches that are magnetically activated by the level gauge float directly through the chamber wall of the gauge. These switches are easily adjustable. There is no piping to redo for a simple change in set point.

All of these switches may all be wired for rising or falling level and/or NC or NO operation. Each switch has approximately 1/2 inch deadband to eliminate chattering and all have "break before make" action.

MLS-3 / MLS-3EX Reed Switch

The MLS-3 is a hermetically sealed reed switch with form C contacts. A bias magnet latches the switch, maintaining the contact after the float continues to rise or fall with the liquid level. The MLS-3EX is an explosion-proof version of the MLS-3 with terminal block.

MLS-3 Level Switch

MLS-3 / MLS-3EX Specifications

Deadband	0.5 inch
Max. Temp.	600 Deg F
Min. Temp.	-40 Deg F
Contacts	SPDT
Contact Rating:
Volts AC	130VAC
AC Current	1.0A
Watts	30W
MLS-3 Housing	316SS encapsulated, General Purpose
MLS-3EX Housing	Explosion-proof condulet, Class 1, Div 1, Group C, D

MLS-9EX Tilt Switch

The MLS-9EX is an explosion-proof, hermetically sealed mercury tilt switch. This switch has a 10A contact current rating and is capable of operating valves and activating pump starters without an interposing relay. It is a SPDT switch with "break before make" action. As the float passes, the switch changes state with a rocking action caused by a rod magnet which latches it in place. The contacts are maintained until the float passes again in the opposite direction.

MLS-9EX Specifications

Deadband	0.5 inch
Max. Temp.	400 Deg F
Min. Temp.	-30 Deg F
Contacts	SPDT
Contact Rating:
Volts AC	240VAC
AC Current	10.0A
Watts	1250W
Housing	Explosion-proof condulet, Class 1, Div 1, Group C, D

PS-1 Pneumatic Relay

The PS-1 is a pneumatic relay that switches air pressures from 30 to 100 psi. It is basically a flapper-nozzle type assembly that operates a pneumatic relay. As the float passes, the flapper either clears or blocks the nozzle opening creating a vent or a pressure action. This action moves the relay diaphragm and switches the supply air pressure to the output. When the float passes again in the opposite direction, the pressure is removed and the output is vented. The PS-1 is best suited for sounding pneumatic alarms, activating winkies or opening and closing air or gas activated valves. It is ideal for use for level control where no power is available.

PS-1 Specifications

Deadband	0.5 inch
Max. Temp.	200 Deg F
Min. Temp.	0 Deg F
Supply Pressure	30-100 psi
Housing	316SS, NEMA 4

Specifications are subject to change without notice.

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