Eclipse® 700 Guided Wave Radar Transmitter

The Eclipse® Model 700 Transmitter is a loop-powered, 24 VDC level transmitter that is based upon the proven and accepted technology of Guided Wave Radar (GWR).

Encompassing a number of significant engineering accomplishments, this leading-edge level transmitter is designed to provide measurement performance well beyond that of many of the more traditional technologies. 

This single transmitter can be used in a wide variety of applications ranging from very light hydrocarbons to water-based media.

One universal Model 700 transmitter can be used and interchanged with several different probe types and offers enhanced reliability as it is certified for use in critical SIL 2/3 hardware safety loops.

The ECLIPSE Model 700 supports both the FDT/DTM and Enhanced DD (EDDL) standards, which allow viewing of valuable configuration and diagnostic information such as the echo curve in tools such as PACTware™, AMS Device Manager, and various HART® Field Communicators.

Micropower impulse radar combines time domain reflectometry, equivalent time sampling, and modern low power circuitry. This synthesis of technologies creates a high-speed Guided Wave Radar 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.

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 and single element (rod or cable) are the two basic configurations used today, each with specific strengths and weaknesses.

Single element GWR probes act quite differently from coaxial 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.

ECLIPSE Guided Wave Radar is based upon the technology of TDR (Time Domain Reflectometry). TDR utilizes pulses of electromagnetic energy transmitted down a wave guide (probe).

When a pulse reaches a surface that has a higher dielectric constant than the air (εr = 1) in which it is traveling, a portion of the pulse is reflected.

The transit time of the pulse is then measured via high speed timing circuitry that provides an accurate measure of the liquid (or solids) level.

The amplitude of the reflection depends on the dielectric constant of the product. The higher the dielectric constant, the larger is the reflection.