Factors affecting the normal operation of the ultrasonic level gauge

2021-05-08 02:26:10

Several factors affecting the normal operation of ultrasonic level gauge

1. The effect of stirring on the ultrasonic level gauge:
The on-site container often has agitation, and the liquid fluctuation is relatively large, which affects the measurement of the ultrasonic level gauge; in this case, the rotation speed of the agitator can be appropriately reduced, or the probe can be deviated from the stirring center; the waveguide can also be installed, thereby effectively eliminating the stirring. The effect of agitation on the level measurement.
2. The effect of foam on the ultrasonic level gauge:
In the process of measuring the liquid level with an ultrasonic level gauge, foam interference is often encountered. According to the properties, foam can be divided into four types: dry, wet, neutral and heavy.
Dry foam and wet foam can reflect the ultrasonic waves back, so the ultrasonic level gauge is used to measure no effect; the neutral foam absorbs and diffuses part of the ultrasonic waves, thus weakening the reflection of the ultrasonic waves and causing the echo to be unstable. Therefore, when the surface of the medium is thick and thick, the measurement error of the ultrasonic level gauge will be large or even impossible to measure. In severely disturbed conditions, the ultrasonic level gauge can be used to shield the foam by adding a wave-eliminating tube.
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 up to the top of the tank, forming a vapor layer that absorbs and scatters the ultrasonic pulse. The effect of the vapor layer on the measurement can be reduced or weakened by the addition of a waveguide.
4. Impact of blind zone on ultrasonic level gauge:
The blind spot of the ultrasonic level gauge is just like the human eye. When the object is very close to the eye, it is not clear. This distance is called a blind spot. The dead zone of the ultrasonic level gauge varies depending on the range. If the range is small, the blind zone is small and the range is large, and the blind zone is large. Therefore, the maximum liquid level required to be measured must not be higher than the blind spot of the ultrasonic level gauge.
5. The influence of pressure and temperature on the ultrasonic level gauge:

First, the speed of sound cannot propagate under vacuum, and the essence of ultrasound is a kind of sound wave, and it belongs to mechanical waves, so it cannot propagate in vacuum. Secondly, it is the temperature. The higher the temperature, the higher the ultrasonic speed. Although the parameters of the ultrasonic level gauge have the maximum pressure value, the maximum pressure value will decrease as the temperature increases, so when selecting the type, Note this parameter. In addition, for the level gauge installed outdoors, measures such as adding a sun shield can be used to reduce the influence of temperature factors.


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