Radar Level Measurement

Free-space radar level measurement is a non-contact technology used for continuous level measurement across a broad range of tank and silo applications. It is positioned as a strong option under extreme process conditions - pressure, temperature, and vapor presence - and is also applicable in hygienic services with suitable mechanical designs. With multiple antenna options available, radar instruments can be adapted to different vessel geometries, media types, and installation constraints across industries such as water/wastewater, life sciences, food, and general process sectors.

The measuring principle uses high-frequency radar pulses emitted by an antenna toward the product surface. The pulse is reflected from the surface due to a change in relative dielectric constant, and the instrument measures the time-of-flight of the reflected signal. Time-of-flight is proportional to distance traveled; with known tank geometry, the device calculates level from the measured distance between the antenna reference and the product surface. This produces a continuous measurement that does not require contact with the medium.

Key benefits include non-contact, maintenance-free operation and measurement described as unaffected by medium properties such as density and conductivity; in bulk solids service, performance is also described as unaffected by filling noise and dust. The measuring range can be adjusted to match the process, and radar is highlighted for suitability at high temperatures (up to +450°C as noted). These attributes make radar a common default choice where long-term reliability and reduced maintenance exposure are priorities.

Typical applications include storage and process tanks containing corrosive or aggressive media, general-purpose inventory measurement, and high-accuracy tank gauging scenarios when configured appropriately. Radar is used in liquids and bulk solids, with antenna selection tailored to surface behavior, dust loading, nozzle length, and required dynamics. Hygienic versions support applications where cleanability and sanitary connections are important, extending radar use into food and life science installations.

Implementation considerations include antenna type and mounting location relative to internals, baffles, and fill streams. While radar is robust, attention to false echoes from obstructions and nozzle reflections improves stability and reduces commissioning time. Configuration should address blocking distance, empty calibration reference, and range mapping to control/safety thresholds. Where radar is used for critical alarms, diagnostic capabilities and proof-test strategies should be aligned with the facility’s functional safety and reliability requirements.

At Eastern Controls, We are proud to be the exclusive authorized sales and service representative for Endress+Hauser.