Eclipse® Model 706 Guided Wave Radar Transmitter

The Eclipse Model 706 is a two-wire, loop-powered, 24 VDC liquid level transmitter based on the revolutionary Guided Wave Radar (GWR) technology. The Model 705 can be used with all available coaxial, twin rod and single rod probes. This leading-edge transmitter is designed to provide measurement performance well beyond that of many traditional technologies.

Measurement Principle

Guided Wave Radar is based upon the principle of TDR (Time Domain Reflectometry). Pulses of electromagnetic energy are transmitted down a probe. The pulse is reflected when it reaches a liquid surface.

  • Low dielectric measurement capability
  • Volumetric output
  • Quick connect/disconnect probe coupling
  • Operates in visible vapors and ignores most foams
  • IS, XP, and Non-Incendive approvals
  • Ignores coating buildup
  • Liquids / Slurries / Solids
  • Hydrocarbons to water-based media
  • (dielectric 1.4 - 100)
  • Most process or storage vessels up to 100 feet
  • Bridles and by-pass chambers
  • FOUNDATION fieldbus™ digital output
  • Display/keypad
  • Local remote mounting
  • Interface measurement

Technology of the Eclipse® Model 706 Guided Wave Radar Transmitter

Eclipse® Guided Wave Radar is based upon the technology of TDR (Time Domain Reflectometry). TDR utilizes pulses of electromagnetic energy transmitted down a probe. When a pulse reaches a surface that has a higher dielectric than the air/vapor in which it is traveling, the pulse is reflected. An ultra high-speed timing circuit precisely measures the transit time and provides an accurate level measurement.

Eclipse GWR can be utilized to detect overall level or interface level, and when used with a HART® splitter, it can transmit two 4-20 mA signals.


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