Radar Level Sensing

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Principle

Radar is a top-tier method for non-contact level or distance measurement. Unlike ultrasonic sensors, radar is unaffected by dust, foam, or most surface disruptions. It’s also highly effective over long distances, handling measurements beyond 60 meters if needed. By performing complex Time-Of-Flight calculations on each radio pulse, radar units deliver extremely accurate and rapid results for tank-level measurement.

Advantages

  • Non-contact
  • Effective for solid and liquid applications
  • Samples over a wide area rather than a single point
  • Unaffected by ultrasonic sensor weaknesses
  • Long-range capability

Disadvantages

  • Higher cost compared to ultrasonic measurement
  • A significant ‘Dead Zone’ directly in front of the sensor where measurements can’t be taken

Considerations

Radar sensors, like ultrasonic ones, can be confused by narrow channels, tank protrusions, or irregular vessel shapes due to additional echoes reflecting within the tank. Advanced models offer ‘false echo suppression’ to filter out these unwanted echoes, focusing only on the valid target surface echo. Different models are available, optimized for various applications based on specific media types and frequencies.

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