Guided Wave radar

eclipse model 706 transmitter

The ECLIPSE Model 706 transmitter is an advanced two-wire, 24 VDC, loop-powered transmitter. Microprocessor-based circuitry controls the measurement engine and provides an analog 4-20 mA signal with HART® or FOUNDATION fieldbus™ digital communication output.Using GWR technology, ECLIPSE measurement performance is not process-dependent; therefore, changing specific gravity and dielectric constant have little or no effect on measurementaccuracy. The measurement engine of ECLIPSE is optimized under firmware control to provide continuous and reliable level detection, and even significant amounts of media buildup on a single rod probe will not affect accurate detection of liquid level.


coaxial probes

Coaxial Probe

The Coaxial probe is the most efficient of all probe configurations and should be the first consideration in all applications. Analogous to the efficiency of modern, coaxial cable, coaxial probes allow almost unimpeded movement of the high frequency pulses throughout its length. The electromagnetic field that develops between the inner rod and outer tube is completely contained. The efficiency and sensitivity of a coaxial configuration yields robust signal strength even in extremely low dielectric (ƒÃr .1.4) applications. The sensitivity of this "closed" design, however, also makes it more susceptible to measurement error in applications of coating and buildup.
twin rod probes

Twin Rod Probe

The relationship of the Twin Rod probe to a Coaxial is similar to that of older, twin-lead, antenna lead-in to modern, coaxial cable. 300 ohm twin-lead cable simply does not have the efficiency of 75-ohm coax. The parallel conductor design is less sensitive than the concentric coaxial. This translates to Twin Rod GWR probes measuring dielectrics of only ƒÃr .1.9. The "open" design also allows more accurate measurement where coating/buildup is possible. A film coating has little effect on performance. However, bridging of material between the rods or buildup on the spacers can cause improper measurement and should be avoided. With a twin-rod probe the electromagnetic field develops not only between the rods, it also expands outward making it more sensitive to proximity effects of objects located immediately around it.
single rod probes

Single Rod Probes

Choosing the proper Guided Wave Radar (GWR) probe is the most important decision in the application process. The probe configuration establishes fundamental performance characteristics. Coaxial, twin element (rod or cable) and single element (rod or cable) are the three basic configurations used today; each with specific strengths and weaknesses. Single element GWR probes act quite differently from Coaxial and Twin element designs. The pulses of energy develop between the center rod and the mounting nut or flange; the pulse propagates down the rod as it references its ground at the top of the tank. The efficiency of the pulse "launch" is directly related to how much metallic surface exists around it at the top of the vessel. Signal transmission can be significantly improved by placing a single rod inside of a bridle or chamber.


Aurora combines the operating system of a conventional float-based MLI with the leading-edge Eclipse Guided Wave Radar transmitter developed for level measurement applications by Magnetrol. The result is true level-measurement redundancy in a single-chamber design. Using a 3" or 4" chamber to house both of the Eclipse coaxial style probe and the float, these devices operate seamlessly to provide continuous electronic Guided Wave Radar measurement and visual indication. There are six basic configuration styles, and over fifteen material selections for the Aurora. 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.
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