What is the Blocking Distance (blind range, dead zone) for Radar Level Measurements?
The blocking distance occurs when the level is too close to the radar instrument; reflections are no longer received when the radar emits microwave (or) ultrasonic pulses.
Why do we have a Blocking Distance?
The level measurement equipment can either produce (or) receive waves, but not both at the same time.
Level echoes inside the blocking distance are unable to analyzed due to the sensor’s transitory properties, making an accurate measurement impossible.
The blocking distance (BD) varies depending on the type of sensor, however it should be considered for correct level measurement.
This blocking distance is simply the small range around the transmitter that the transmitter will disregard if waves return from this distance.
The blocking distance instructs the transmitter hardly to consider the waves returning from that region. The true measurement range commences below the blocking distance.
Though blocking distance is included in the range, the true measurement range excludes it as a variable.
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