1. Calibration of the transmitter is crucial. Accuracy of measurement depends on the accuracy of calibration. The Empty distance “A” and measurement span “D” is to be ascertained correctly for inclusion in calibration of the transmitter.
2. The transient characteristics of the sensor will develop a Blocking distance. Span “D” should never extend to the blocking distance.
3. There are some interference echoes developed by the edges, welded joints etc. This is taken care by the software of the transmitter and called interference echo suppression
4. Velocity of sound changes due to the variation of air temperature. An integrated temperature sensor is used to compensate for changes in velocity of sound due to temperature variations.
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