1. Influence of stirring on ultrasonic level meter:
on-site containers are often stirred, and the liquid fluctuation is relatively large, which affects the measurement of ultrasonic level meter. In this case, the rotation speed of the stirrer can be appropriately reduced or the probe can be deviated from the stirring center. Static tubes can also be installed to effectively eliminate the influence of stirrer stirring on liquid level measurement.
2. Influence of foam on ultrasonic level gauge:
in the process of using ultrasonic level meter to measure the liquid level, often encounter the interference of foam. According to the properties of foam can be divided into: dry, wet, neutral, heavy four. Dry foam and wet foam can reflect the ultrasonic wave back, so the use of ultrasonic level meter to measure no effect; neutral foam will absorb and diffuse part of the ultrasonic wave, which will weaken the reflection of the ultrasonic wave, resulting in unstable echo. 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. Under the condition of serious interference, the E H ultrasonic level gauge can shield the interference of foam by installing static tube.
3. Influence of steam and mist on ultrasonic level gauge:
, when the working environment temperature is very high, the liquid medium is easy to produce steam or mist. Because the steam is lighter than the air, it floats to the top of the tank, forming a layer of steam layer that absorbs and scatters the ultrasonic pulse. The effect of the vapor layer on the measurement can be reduced or weakened by adding a static tube.
4. Influence of blind area on E H ultrasonic level gauge:
ultrasonic level gauge is just like the human eye. The blind area is when the object is very close to the eye, but it cannot be seen clearly. This distance is called the blind area. The blind area of the E H ultrasonic level gauge varies according to the range. If the range is small, the blind area is small, and if the range is large, the blind area is large. Therefore, the maximum level required to be measured shall not be higher than the blind zone of the ultrasonic level meter.
5, pressure and temperature on the ultrasonic level gauge:
First of all, the speed of sound cannot be propagated in a vacuum, and the essence of ultrasound is a sound wave, and it is a mechanical wave, so it cannot be propagated in a vacuum. Secondly, it is the temperature. Although the parameters of the ultrasonic level meter have a maximum pressure value, the maximum pressure value will decrease accordingly with the increase of temperature, so pay attention to this parameter when selecting the type. In addition, for the level meter installed outdoors, measures such as installing a sunshade can be used to weaken the influence of temperature factors.
pay attention to the following when installing the tube:
1. Select the appropriate catheter diameter.
2. The interior of the conduit shall be smooth without welding seam.
3. Open small holes in the blind area to ensure the pressure balance inside and outside the pipe.
4. The lower end of the pipe shall be immersed below the lowest measured liquid level.
5, the lower end of the catheter to open 45 ° oblique mouth, to maintain the normal flow of liquid.