The appeal of magnetic level indicators 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. Availability of switches and transmitters adds to their desirability by providing a much less expensive system than a build up of sight glasses, alarm switches and transmitters, all separately piped to the vessel.
Atlas® Principle of Operation
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 which 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.
Aurora® Principle of Operation
Aurora combines the operating system of a conventional float-based MLI (Atlas) with the leading-edge Eclipse® Guided Wave Radar transmitter. Since the signal from the Eclipse is carried within a waveguide, process conditions which hamper other measurement technologies have virtually no effect on Eclipse.
The result is true level-measurement redundancy in a single-chamber design.
Gemini® Principle of Operation
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.
