Operating Principle

The appeal of magnetic level indicator technology is total isolation of the process within a sealed piping column. Elimination of leaking seals, clouded glasses, broken glass tubing, plus easy access cleaning and adaptation to a variety of mounting styles and process connections. Magnetic level indicators eliminate leaking seals, clouded glasses and broken glass tubing, while providing easy-access cleaning and adaptation to a variety of mounting styles and process conditions.


Within the ATLAS piping column is a float containing an internal group of magnets. A rise or fall of the fluid in the process tank corresponds to a similar change within the piping column. In response to the level movement the float moves up or down accordingly.

Clamped to the piping column in total isolation from the process liquid is a visual indictor housing. It contains the choice of indicator, either a series of flags or a follower.

The individual flags or the follower contain an alignment magnet that couples with the float magnets as the float moves up or down within the piping column. Float movement rotates the flags and changes their color, or in the case of the follower moves the follower to the point of level.

The position of the follower, or point at which the flags change color, represents true level. Level is indicated or "read" by the corresponding point on the measuring scale.


The AURORA magnetic level indicator combines the operating system of a conventional float-based magnetic level indicator (ATLAS) with the leading edge Eclipse® Guided Wave Radar transmitter. Since the signal from the ECLIPSE transmitter is carried within a waveguide, process conditions that hamper other measurement technologies have virtually no effect on the ECLIPSE unit's accuracy and reliability.

The result is true level-measurement redundancy in a single-chamber design.


Gemini's twin chamber design is unique to the MLI industry.

Gemini combines the operating system of a conventional float-based MLI (Atlas) and provides a second chamber for the installation of an additional liquid level measurement device such as an Eclipse Guided Wave Radar transmitter.


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