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Common precautions in the application of ultrasonic level gauges

2020-03-03 View Original

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1. Effect of stirring on ultrasonic level gauges: There is often stirring in containers in the field, resulting in significant fluid fluctuations that affect the measurement accuracy of ultrasonic level gauges; In such cases, it is possible to appropriately reduce the speed of the stirrer or move the probe away from the center of stirring ; Static tubes can also be installed to effectively eliminate the impact of mixer agitation on level measurement. 2. Effect of foam on ultrasonic level gauges: When using ultrasonic level gauges to measure liquid levels, interference from foam is a common issue. Foams can be classified into four types based on their properties: dry, wet, neutral, and heavy. Dry foam and wet foam can reflect ultrasonic waves back, so using an ultrasonic level gauge for measurement has no impact ; Neutral foam absorbs and disperses some of the ultrasonic waves, thereby reducing the reflection of those waves and resulting in unstable echoes. Therefore, when the surface of the medium is covered with thick and dense foam, the measurement error of the ultrasonic level gauge becomes significant, or it may even be unable to take measurements. 3. Effect of steam and mist on ultrasonic level gauges: When the temperature in the operating environment is high, the liquid medium tends to produce steam or mist. Since steam is lighter than air, it rises to the top of the tank, forming a layer of steam that absorbs and scatters ultrasonic pulses. By installing static tubes, the impact of the steam layer on measurements can be reduced or minimized. 4. Impact of the blind zone on ultrasonic level gauges: The blind zone of an ultrasonic level gauge is similar to that of the human eye; it refers to the situation where an object cannot be seen clearly when it is too close to the sensor, and this distance is known as the blind zone. The blind zone of ultrasonic level gauges varies depending on the range. A smaller range results in a smaller blind spot, while a larger range leads to a larger blind spot. Therefore, the maximum liquid level to be measured must not be higher than the blind zone of the ultrasonic level gauge. 5. Influence of pressure and temperature on ultrasonic level gauges: Firstly, the speed of sound cannot propagate in a vacuum, and since ultrasonic waves are a type of sound wave and belong to mechanical waves, they too cannot travel in a vacuum. Secondly, there is temperature. Although the parameter summary for ultrasonic level gauges includes a maximum pressure value, this value decreases as the temperature rises; therefore, this parameter needs to be taken into consideration when selecting a gauge. Furthermore, for level gauges installed outdoors, measures such as installing sunshades can be taken to reduce the impact of temperature factors. For more information, please visit the company’s official website at http://www.yb1518.com/. Please retain this link when reproducing the content! http://www.yb1518.com/UploadFiles/2011118121525564.jpg

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