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  • 超声波液位计在液位仪表中的的优势及安装技巧分析
  • 本站编辑:杭州特力声科技有限公司发布日期:2019-09-20 19:21 浏览次数:

超声波液位计也称超声波物位计,超声波水位计,超声波料位计。是一种常见的非接触式液位仪表。适合石油、化工、自来水、污水处理、水利水文、钢铁、煤矿、电力、交通以及食品加工等行业。它安装操作简便,适用性广,价格低廉。那么,超声波液位计有哪些优点,安装时有什么技巧,应该注意哪些问题呢?小编帮大家整理如下:


The ultrasonic level gauge is also called the ultrasonic level gauge, the ultrasonic level gauge and the ultrasonic level gauge. It is a common non-contact liquid level instrument. Suitable for petroleum, chemical industry, tap water, sewage treatment, water conservancy and hydrology, iron and steel, coal mine, electric power, transportation and food processing industries. It is easy to install and operate, wide applicability and low price. So, what are the advantages of the ultrasonic level gauge, what are the skills when installing it, and what problems should we pay attention to? Xiaobian helps you sort it out as follows:




超声波液位计安装


Installation of ultrasonic level gauge




一、超声波液位计的优缺点


I。 Advantages and disadvantages of ultrasonic level gauge


超声波液位计安装方便,性能稳定,测量精度高,价格低廉。但是对温度,粉尘,蒸汽,压力的影响比较敏感。


The ultrasonic level gauge has the advantages of convenient installation, stable performance, high measurement accuracy and low price. But it is sensitive to temperature, dust, steam and pressure.


二、弄清原理,找准位置


2. Clarify the Principle and Find the Position


超声波液位计原理:超声波液位计安装于容器上部,在电子单元的控制下,探头向被测物体发射一束超声波脉冲。声波被物体表面反射,部分反射回波由探头接收并转换为电信号。从超声波发射到被重新被接收,其时间与探头至被测物体的距离成正比。电子单元检测该时间,并根据已知的声速计算出被测距离。用探头到罐底的距离-探头到液位的距离= 实际液位或者物位高度。所以,超声波液位计应该安装在容器顶部,对准需要测量的液体表面。


Principle of ultrasonic level gauge: The ultrasonic level gauge is installed on the upper part of the container。 Under the control of the electronic unit, the probe emits a bunch of ultrasonic pulses to the measured object。 Acoustic waves are reflected by the surface of the object, and part of the reflected echoes are received by the probe and converted into electrical signals。 The time from the transmission of the ultrasonic wave to the re-reception is proportional to the distance from the probe to the object under test。 The electronic unit detects the time and calculates the measured distance according to the known sound velocity。 The distance from the probe to the bottom of the tank - the distance from the probe to the liquid level = the actual liquid level or the material level height。 Therefore, the ultrasonic level gauge should be installed on the top of the container, aiming at the liquid surface to be measured。






三、现场使用时候的安装注意事项


III。 Installation Notices for Site Use Time


1.垂直安装探头


1. Vertical mounting probe


换能器安装的时候,要保证换能器的发射面和要被探测的液面平行,这样声波就可以垂直发射到被测物体表面。这样可以保证最大的能量返回。


When the transducer is installed, the transmitting surface of the transducer should be parallel to the liquid surface to be detected, so that the sound wave can be emitted vertically to the surface of the object under test. This ensures maximum energy return.


安装技巧:如果现场环境有蒸汽,容易形成水珠附在探头的表面,并且探头的量程比实际要测量的距离大的多。那么可以倾斜3度左右,这样可以避免水珠结水的影响。


Installation Skills: If there is steam in the field environment, it is easy to form water droplets attached to the surface of the probe, and the range of the probe is much larger than the actual distance to be measured。 Then it can be tilted about 3 degrees, so as to avoid the influence of water droplets。


2。避开盲区


2。 Avoiding Blind Areas


最高液位到超声波液位计探头表面的距离应大于探头的盲区。


The distance from the highest liquid level to the probe surface of the ultrasonic liquid level meter should be greater than the blind area of the probe。


这里需要注意的是:我们的盲区是在比较理想的状态下测得的。因此如果我们的安装的是封闭的罐体,那么盲区值最好加大20%。如果因为液体会搅动,用了很长的导管来安装,那么盲区值最好也加大20%为了避开盲区,我们经常会用加长导管的方式来避开盲区。在利用加长导管安装的时候,必须保证探头的锐角度。


It should be noted here that our blind area is measured in a relatively ideal state. Therefore, if we install a closed tank, then the blind zone value should be increased by 20%. If the liquid is agitated and a long tube is used to install it, then the blind area value should be increased by 20%. In order to avoid the blind area, we often use lengthened catheter to avoid the blind area. When installing the lengthened catheter, the sharp angle of the probe must be ensured.


3。远离罐壁和障碍物


3。 Away from tank walls and obstacles


如果罐壁是光滑的,并且液位降低的时候,不会出现挂料的情况,那么大部分距离灌壁30cm的距离安装就可以。如果灌壁是粗糙的,那么探头安装的位置要远离罐壁。罐底不是平面的,那么在零液位的时候可能出现误差。如果是圆锥型底面,可以考虑把探头安装在圆锥顶端正上方。对于圆形的横杆,只要距离超过1m,直径不超过5cm,影响不大。否则尽量避开。但对平面的横杆,罐壁有直角的情况,要尽量的避开。


If the tank wall is smooth and the liquid level decreases, there will be no hanging material, then most of the distance from the wall 30 cm can be installed. If the grouting wall is rough, the probe should be installed away from the tank wall. The bottom of the tank is not flat, so errors may occur at zero liquid level. If it is a conical bottom, you can consider installing the probe directly above the top of the cone. For the circular bar, as long as the distance exceeds 1 m and the diameter does not exceed 5 cm, the effect is not significant. Otherwise try to avoid it. But for the horizontal bar and the tank wall with right angle, we should avoid it as far as possible.




超声波液位计现场


On-site ultrasonic level gauge




4.避免搅拌和波动


4. Avoid stirring and fluctuation


如果有搅拌或者波动的场合,可以用加长导管安装。导管直接申入液位底面。导管的直径只要大于探头的辐射面即可,但是要保证导管的内壁光滑,并且液位升降过程中不挂料,管内液体和管外一致。如果大量程不适合用导管安装的,可以减小量程使用,具体减小多少要看波浪的大小。


If agitation or fluctuation occurs, lengthened conduits can be used for installation. The catheter is directly applied to the bottom of the liquid level. The diameter of the catheter is only larger than the radiation surface of the probe, but the inner wall of the catheter should be smooth, and no material is hung during the rising and falling of the liquid level. The liquid in the tube is identical with that outside the tube. If a large range is not suitable for catheter installation, the range can be reduced, depending on the size of the wave.


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