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Omnitrol - Mechanical Level Controls

The Principle of Operation

On/Off: No Maybes!
The Omnitrol Liquid Level Controls offer patented "snap action" operation based on the unique and proven principle of a "constantly engaged magnetic field". It provides a clean, non-sticking positive switch each time. No maybes, no in-betweens, and no actuator return springs.


Low Position, Liquid Level Rising. There are four inner magnets separated by an air space as illustrated in Figure 1. Magnets No. 1 and No. 4 attract the outer magnet Magnets No. 2 and No. 3 act as a single magnet and repel the outer magnet. The inner magnets, as well as the outer magnet, create a separate field that holds the outer magnet in the position shown in Detail "A' entitled "Low Level". This prevents nuisance switching created by the liquid level surges or surface agitation. As the liquid level rises, the inner rod and magnet assembly rises and magnets no. 2 and no. 3 will be passed through the field of the outer magnet. The repelling force on the outer magnet will then be acting in a downward direction.
Omnitrol - Mechanical Level Controls
Detail "A" Low position liquid Level rising

Simultaneously, the attracting force of Magnet No. 1 will decrease and that of No. 4 will increase. The outer magnet or actuator switch assembly will snap into its new locked position as shown in Detail "B".

High Position, Liquid Level Falling. Detail "B" shows the switch and magnet status of high liquid level. As the level falls, all forces described above are reversed until the inner repelling magnets have been forced through the magnetic field of the outer magnet and the actuator is again in the "locked" position shown in Detail "A".

What Comprises an Omnitrol Product?
  • the Switch
  • the Housing
  • the Displacer
  • Top Mounted
  • Chamber Mounted
  • Side Mounted
Omnitrol Switches
Positive switching is obtained by Omnitrol's constantly-engaged magnetic field to assure snap action when making and breaking circuits to prevent arcing. Durable mercury switches have a sealed atmosphere of hydrogen. It insures cool operation and extended life. The mercury is triple distilled. Switch units are available in SPST, SPDT, DPST, or DPDT and have silicon rubber insulated lead wire.

Simple, reliable operation - Only a small tilting motion, with little operating force, is required to operate the switch. Standard mercury tubes are available in three groups. In addition, anti-vibration mercury switches and microswitches are available. Hermetically sealed as well.

Group A - Mercury to electrode contact switches. This group is ideal for control circuits. Basic Rating is 7.4 Amps at 120 Vac.

Group B - Mercury to mercury contact switches designed to use on motors up to 1/2 HP at 240 VAC. Basic Rating is 13 Amps at 120 Vac.

Group D - Mercury to electrode contact switches. They are suitable for control circuits where vibration prohibits the use of the standard mercury tube. Basic Rating is 4 Amps at 120 VAC.

Group E - Micro Switches suitable for control circuits or motors up to 2 HP at 250 Vac, especially where vibration problems are prevalent or where mercury is prohibited. Basic Rating is 20 Amps at 480 Vac.
Omnitrol - Mechanical Level Controls
Detail "B" High position liquid level falling