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Eclipse® Flexible
Twin Rod Probes
Model - 7x7
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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.
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 εr ≥ 1.9
The "open" design also allows more accurate measurement where coating/buildup are possible. A film coating has little effect on performance.
Literature
Additional Tools:
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Measurement Principle:
Guided Wave Radar is based upon the principle of TDR (Time Domain Relectometry). Pulses of electromagnetic energy are transmitted down a probe. The pulse is reflected when it reaches an impedance change such as a liquid surface. The transit time is calculated and converted to level.
Features:
- Temperatures to +400° F (+200° C)
- Pressures to 1000 psig (70 bar)
- Viscosities to 1500 cP
- 75 foot maximum length
Applications:
- Process vessels
- Storage vessels
- Bridles
- Bypass chambers
Options:
- NPT, BSP, and flange connections
- FM, CSA, and ATEX approvals
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