Influence of agitation and foam on the measurement of the top-mounted ultrasonic level gauge

The principle of ultrasonic level gauge measuring liquid level: the transducer part of the ultrasonic level gauge uses piezoelectric ceramics as the transmitter and receiver of ultrasonic pulses. When a certain voltage is applied to both ends of the piezoelectric ceramics, the piezoelectric ceramics are excited to vibrate Ultrasonic pulses are generated, and then the ultrasonic transducer changes to the receiving state to analyze the received ultrasonic echo pulses. *It is necessary to monitor whether the received ultrasonic pulse is the echo, if so, detect the travel time of the sound wave, and then the processing unit converts the time into distance and liquid level, and then outputs it by the output unit. When the ultrasonic level gauge is working, the high-frequency pulse sound wave is emitted by the transducer, and it is reflected on the surface of the measured object, and the returned reflected echo is received by the same transducer and converted into an electrical signal. The time between pulse transmission and reception is proportional to the distance from the transducer to the surface of the object. The relationship between the distance S of the sound wave transmission, the speed of sound C and the transmission time T can be expressed by the formula: S=CⅩT/2. When installing an ultrasonic level meter, the blind area of ​​the ultrasonic level meter must be considered. When the liquid level enters the blind zone, the ultrasonic transmitter cannot measure the liquid level, so when determining the range of the ultrasonic liquid level gauge, a margin of 50 cm must be left. When installing, the transmitter probe must be higher than the high liquid level. About 50 cm. In this way, the accurate monitoring of the liquid level and the safety of the ultrasonic level gauge can be ensured. In actual use, due to ill-conceived installation, the level gauge is submerged by water, resulting in complete damage to the level gauge. 1) The installation height of the instrument should be less than the range of the purchased instrument. 2) The distance from the transmitting surface of the transducer to the highest liquid level (that is, the blind area) should be greater than the blind area of ​​the purchased instrument. 3) The emitting surface of the transducer should be kept parallel to the liquid surface. 4) The installation position of the transducer should try to avoid the position where the liquid level fluctuates violently, such as the inlet and outlet directly below. 5) If the tank wall or tank wall is not smooth, the instrument should be separated from the tank wall or tank wall by more than 1.0m. 6) Although the instrument has lightning protection devices, it is better to install a special lightning protection device at the inlet and outlet ends of the instrument when it is used in a lightning-prone area. 7) When used in particularly hot and cold places, that is, when the ambient temperature may exceed the working requirements of the instrument, it is best to install high and low temperature protection devices around the instrument. The influence of stirring and foam on the ultrasonic level gauge 1. The influence of stirring on the ultrasonic level gauge: the on-site container is often stirred, and the liquid fluctuation is relatively large, which affects the measurement of the ultrasonic level gauge; in this case, the speed of the agitator can be appropriately reduced , or the probe is deviated from the stirring center; a static pipe can also be installed, so as to effectively eliminate the influence of the stirring of the stirrer on the liquid level measurement. 2. The influence of foam on the ultrasonic level gauge: In the process of using the ultrasonic level gauge to measure the liquid level, the interference of foam is often encountered. Foams can be divided into four categories according to their properties: dry, wet, neutral, and heavy. Dry foam and wet foam can reflect ultrasonic waves back, so it has no effect on measuring with an ultrasonic level gauge; neutral foam will absorb and diffuse part of the ultrasonic waves, thus weakening the reflection of ultrasonic waves, resulting in unstable echoes. Therefore, when the surface of the medium is thick and thick foam, the measurement error of the ultrasonic level gauge will be large, or even impossible to measure. In addition to the top-mounted ultrasonic level gauge, there is also a type of instrument that uses the principle of ultrasonic to measure is the external-measurement level gauge, also known as the external-mounted liquid level gauge and the external-mounted ultrasonic level gauge. The difference from the top-mounted type is that the external measurement type is attached to the horizontal position of the tank bottom, and the liquid level is measured by using ultrasonic waves to penetrate the tank bottom to reach the gas-liquid interface and return echoes and calculate the height of the liquid level.
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