Several Environmental Factors Affecting the Stability of Ultrasonic Liquid Level Gauge

Ultrasonic liquid level gauge is a common non-contact level and liquid level measuring instrument. It has the characteristics of high measurement accuracy, simple installation, and basically maintenance-free. It can be used to measure the liquid level in various containers. The following are several situations that will affect the normal operation of the ultrasonic level gauge: 1. Stirring affects 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 stirring can be appropriately reduced The rotating speed of the stirrer can be adjusted, or the probe can be deviated from the stirring center; a still can be installed to effectively eliminate the influence of stirring on the liquid level measurement caused by the stirrer. 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 the case of serious interference, the ultrasonic level gauge can shield the interference of the foam by adding a wave absorbing pipe. 3. The influence of steam and mist on the ultrasonic level gauge When the working environment temperature is high, the liquid medium is prone to generate steam or mist. Since the steam is lighter than air, it floats to the tank, forming a layer that absorbs and absorbs ultrasonic pulses. Scattering vapour layer. The influence of the vapor layer on the measurement can be reduced or weakened by adding a still-pipe. 4. The blind spot affects the blind spot of the ultrasonic liquid level gauge. Just like the human eye, the blind spot is when the object is very close to the eye, but it is not clear. This distance is called the blind spot. The blind zone of the ultrasonic level gauge varies according to the range. If the range is small, the blind zone is small; if the range is large, the blind zone is large. Therefore, the liquid level required to be measured shall not be higher than the blind zone of the ultrasonic level gauge. When the ultrasonic level gauge is working, the ultrasonic transducer (probe) emits high-frequency pulsed sound waves, which are transmitted back when they meet the surface of the water to be measured, and the reflected echoes are received by the transducer and converted into electrical signals. The propagation time of the sound wave is proportional to the distance from the transducer to the surface of the measured medium. When the ultrasonic level gauge emits ultrasonic pulses, it cannot detect the reflected echo at the same time. Because the transmitted ultrasonic liquid pulse has a certain time width, and after the ultrasonic wave is reflected, the transducer has residual vibration, and the transmitted echo cannot be detected during the period, resulting in the overlap of the reflected wave and the transmitted wave in a small area under the surface of the probe. Recognition, can not be detected normally, this area is called measurement blind area. The size of the dead zone is related to the range of the ultrasonic level gauge. 5. The influence of pressure and temperature on the ultrasonic level gauge The speed of sound cannot propagate in vacuum, while the essence of ultrasonic wave is a sound wave and belongs to mechanical wave, so it cannot propagate in vacuum. Secondly, it is temperature. The higher the temperature, the greater the ultrasonic speed. Although the parameters of the ultrasonic level gauge have a pressure value, as the temperature increases, the pressure value will decrease accordingly, so pay attention to this when selecting models. parameter. In addition, for the level gauge installed outdoors, measures such as adding a sunshade can be used to reduce the influence of temperature factors.
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