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Level Detection and Measurement by Using Ultrasonic Sensor

DATE: 2015-02-04
BROWSE TIMES: 11

Ultrasonic level instruments works on the basic time-of-flight principle which states that sending a sound wave from a peizo electric transducer to the contents of the vessel, which may contain liquid, solid or slurries level.

This liquid level sensor comprises two elements such as an associated electronic transceiver and a transducer with relatively high efficiency. In case of a liquid level controller, the fluid level can be determined by measuring the trip time difference between a transmitted ultrasonic pulse and a reflected echo.

The frequency range for ultrasonic methods varies from a range of 15-200 kHz for transmitting and receiving ultrasonic waves. The lower frequency instruments are used for the measurement of difficult applications such as longer distances and solid-level measurements, and the instruments with higher frequency are used for shorter liquid level measurements.

The ultrasonic sensors are advantageous as they are not in direct contact with the product, and the level measurement is done without involving any physical contact. They do not have any moving parts.

As a disadvantage, these types of sensors are not suitable for higher pressures in a vacuum and temperature limits of up to 170 degree centigrade.




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