Eclipse® Model 705 Guided Wave Radar Transmitter

The Enhanced Eclipse® Model 705 is a 24 VDC loop-powered transmitter based upon the revolutionary guided wave radar (GWR) technology. This single transmitter can be used with all probe types and offers enhanced reliability, as demonstrated by a Safe Failure Fraction of 91%, allowing it to be used in SIL 3 loops.
This ECLIPSE guided wave radar transmitter is designed to provide measurement performance well beyond that of many traditional technologies. The innovative, patented enclosure is a first in the industry orienting both wiring and electronics compartments in the same plane; and, angled to maximize ease of wiring, configuration and data display.
The ECLIPSE Model 705 transmitter supports the FDT/DTM standard, and a PACTware™ PC software package allows for additional configuration and troubleshooting flexibility.

Operating Principle

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.


Petroleum Refining – Liquefied Gases, Crude Storage, Distillation Columns, Blending Tanks, Finished Product Storage
Power Generation – Feedwater Heaters, Deaerators, Condensate Tanks, Finished Product Storage
Chemical – Chemical Injection, Mixing and Blending, Scrubber Vessels, Finished Product Storage
Water & Wastewater – Clarifier Level, Sludge Level, Lime Slurry Level
Pulp & Paper – Pulp Storage, Pulp Washing Systems, Bar Screens, Finished Product Storage
Food & Beverage – Ingredient Storage, Mixing Vessels, Cookers, Finished Product Storage
Pharmaceutical – Reactors, Buffer Prep, CIP Applications, Finished Product Storage


Low dielectric measurement capability (εr >_ 1.4)
Volumetric output
Quick connect/disconnect probe coupling
Operates in visible vapors and ignores most foams
IS, XP, and Non-Incendive approvals
Ignores coating buildup


Foundation fieldbus™ or PROFIBUS PA digital outputs
Local remote mounting
Interface measurement


XP=Explosion Proof (FM, CSA, ATEX)
IS=Intrinsically Safe (FM, CSA, ATEX)
ELV=EMC/Low Voltage (CE, JIS)
NI=Non-Incendive (FM, CSA)
NS=Non-Sparking (ATEX)


+ Product Catalog - Eclipse Cages
+ Product Catalog - Heavy Duty
+ Product Catalog - Industrial
+ Instruction & Operating Manual - HART
+ Instruction & Operating Manual - Foundation Fieldbus