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How does MLI Technology work? - 6/4/2013 -

Learning Center #1

How does MLI technology Work?

Magnetic level indicators, also known as MLIs, simply provide a high-visibility representation of the liquid level in a vessel. MLIs can be mounted to tanks in a number of different ways. The most popular configuration, however, is called a side-mount. In this illustration, the MLI assembly consists of everything inside the box.

MLIs consist of, at minimum, three major components. The float, which is contained within the chamber, interacts with the externally mounted visual indicator. As liquid rises and falls in the vessel and MLI chamber, the float follows. The magnets in the float interact with magnets inside each indicator flag. As the float rises and falls in the chamber, the magnets slowly turn each flag 180 degrees. This allows the visible flag color to change to a high-contrasting, highly-visible representation of liquid level.

Float designs are available for two major measurement types:

Total Level

A float that measures the top of the uppermost liquid layer.  If the chamber only contains one liquid, a total level float would be required.

Interface Level

A float that measures the separation point between the upper liquid layer, and the lower liquid layer.  A common example of this is the stratification of an oil and water mixture after it has settled.  

What information is needed to evaluate my level application for a Magnetic Level Indicator?
In most cases, the process pressure, temperature, and liquid specific gravity are required.  High liquid viscosities, turbulence, and ambient temperatures are also sometimes considered, as any of these could impact the design.  Consult with an Orion Instruments representative for to consult about your level application.

ChamberFloatVisual Indicator


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