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Aurora® magnetic level indicator

The Aurora® combines the operating system of a conventional float-based magnetic level indicator (MLI) with the leading-edge Eclipse® guided wave radar transmitter developed for level measurement applications. The result is true level-measurement redundancy in a single-chamber design. Using a 3" or 4" chamber to house both the ECLIPSE probe and the MLI float, these devices operate seamlessly to provide continuous electronic guided wave radar measurement and visual indication.

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The product

There are six basic configuration styles and more than 15 material selections for the AURORA magnetic level indicator.

For the first time ever, the ability to accurately and repeatedly measure ultra low dielectric media, high temperature/high pressure process conditions, and media with shifting and changing dielectric values can be accomplished with AURORA.

Guided wave radar technology

Micropower impulse radar (MIR) combines time domain reflectometry (TDR), equivalent time sampling (ETS), and modern low power circuitry. This synthesis of technologies creates a high-speed Guided Wave Radar (GWR) transmitter. The electromagnetic pulses are propagated via a waveguide that focuses the energy and yields a system many times more efficient than Non-Contact Radar.

Magnetic level indicators Technology

Magnetic Level Indicators (MLI) have revolutionized the global visual indication market by offering a safer, reliable, and high-visibility alternative to common gauge glass assemblies. Utilizing a combination of proven buoyancy principles along with the benefits magnetism, MLIs can be customized to fit virtually any process connection arrangement on the vessel.

The chamber and magnetic float is available in a variety of materials and pressure ratings to accommodate the wide variety of complex process applications present in the world’s major industrial facilities.


  • ECLIPSE GWR transmitter
  • Broad range of chamber styles
  • Fabricated non-magnetic chamber
  • ASME and DIN flanges
  • Precision manufactured float
  • Flag or shuttle type indicator


  • Level switches
  • Level transmitters
  • Stainless steel scale
  • Custom scales

Operating principle

The Aurora® Magnetic Level Indicator (MLI) is a hybrid instrument that utilizes both buoyancy and Guided Wave Radar measurement principles in the same chamber.

MLIs rely on a magnetic float that travels up and down with the liquid in a chamber, which is mounted to a pressure vessel or storage tank. The float contains a magnetic assembly that interacts with an externally-mounted visual indicator. As the float follows the liquid, the magnetic field causes highly contrasting flags in the visual indicator to rotate, therby displaying a highly visible representation of the level. In Aurora, a float and guided wave radar probe are separated by a perforated baffle plate, creating two distinct measurement zones within the chamber. This provides a redundant level instrument while minimizing overall footprint and weight.

Magnetically-actuated external point switches and continuous external transmitters can expand the function of the MLI by providing high or low alarms, as well as real-time level data supplied to the control room (4-20mA, HART®, Foundation fieldbus®).


ATEX Ex d, Ex ia, Ex n, Ex t
CCOE Ex d, Ex.ia
EAC (GOST) Ex d, Ex ia, Ex n, Ex t, Metrology
IEC Ex d, Ex ia, Ex n, Ex t
Inmetro Ex d, Ex ia, Ex n, Ex t
SIL SIL 2 (1oo1)
Marine Lloyd’s Register of Shipping (LRS)
Steam Drum Lloyds EN 12952-11 (water tube boilers)
Lloyds EN 12953-9 (shell boilers)
TÜV / DIBt WHG § 63, overfill prevention

Agency approvals for Eclipse 706 GWR. Other approvals are available. Consult factory for more details.

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