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  Principle of liquid level measurement - radar  
     
  The radar level transmitter includes an electronic housing, process connector, probe, and sensor. The probe emits radar pulses to the measured medium at intervals of approximately 1ns. These pulses are reflected back by the surface of the medium and received as echoes by the probe. Radar waves propagate at the speed of light. The time and distance required for the radar pulse to be transmitted and received are proportional, and therefore also proportional to the liquid level. The measured liquid level is converted into an output signal and transmitted as a measurement value.  
     
     
 
     
 
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