Guided Radar Level Measurement

Guided Radar Level Measurement

Guided radar level measurement uses time-of-flight microwave pulses guided along a probe (rod or cable). Reflections occur at the product surface - and, in many cases, at interfaces between liquids - allowing continuous level calculation with high repeatability. Because the signal is guided, performance is typically stable in narrow nozzles, internal obstructions, and conditions where free-space propagation is difficult.

This technology is chosen for demanding liquid services where accuracy and robustness are required. It performs well across broad pressure and temperature ranges, and is often resilient to vapor space effects that challenge ultrasonic methods. Guided radar can also be applied to some bulk solids duties where contact measurement is acceptable and where stable echoes are achievable.

Probe selection and installation detail drive success. Considerations include probe tensioning for cable designs, mounting position relative to agitators or inlet streams, and management of coatings or build-up that could dampen reflections. Material compatibility is essential since the probe is in direct contact with the process. In very sticky services, application-specific probe geometries and diagnostics become important.

Typical applications include reactors, separators, surge drums, blending tanks, and storage vessels handling chemicals, solvents, and process intermediates. Interface measurement in oil/water separation and similar duties is a common strength, particularly when reliable phase boundary tracking is required for control and custody accounting.

Guided radar instruments interface readily via standard analog and digital protocols and are well suited to control strategies requiring tight level control, stable alarming, and strong diagnostic coverage. When properly engineered, guided radar provides a durable continuous measurement solution in vessels that are mechanically complex or process-variable.

Field Instruments & Controls, Inc. an exclusive authorized representative of sales and service for Endress+Hauser.