describe

The measurement of ultrasonic liquid level difference is carried out by an ultrasonic sensor installed on the water surface, which emits a beam of ultrasonic pulse to the surface of the water flow. This pulse signal is reflected back when it encounters the water surface and can be received by the sensor again; The time from ultrasonic emission to re reception is proportional to the distance from the sensor to the surface of the measured object; The instrument detects the time and calculates the distance (i.e. spatial distance) from the surface of the object being measured to the sensor based on the current temperature (measured by the sensor) and the sound velocity of the air, and further converts it to the liquid level value. The underwater distance W on the liquid level surface is directly proportional to the travel time T of the sound wave: W=V × T/2 (where V is the velocity of the sound wave in water). The user sets the height H from the probe to the bottom of the slot, and the instrument automatically converts the pulse travel time T into the corresponding spatial distance value W, and then calculates the difference between H and W to obtain the measured value L.