How does an ultrasonic level sensor work?

Document ID

Document ID TE7486

Version

Version 2.0

Status

Status Published

Published Date

Published Date 10/25/2018
Question
How does an ultrasonic level sensor work?
Summary
Ultrasonic level sensor theory of operation.
Answer
The ultrasonic transducer is mounted over the flow stream at the proper location for head/level measurement.  The transducer emits a pulse of sound at a high frequency and waits for the echo to return from the surface of the water.  The time it takes for this echo to return is directly related to the distance between the transducer and the surface of the water.  As the level in the flow stream increases, the time it takes for the echo to return to the transducer decreases (distance is shorter).
By continuously transmitting these pulses and timing the returning echoes, the sensor measures the level of liquid in the flow stream.  After measuring the level, the microprocessor converts the level reading to a flow rate based on the user-defined characteristics of the primary device.
 

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