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  • 超聲波液位計在液位儀表中的的優勢及安裝技巧分析
  • 本站編輯:杭州特力聲科技有限公司發布日期:2019-09-20 19:21 瀏覽次數:

超聲波液位計也稱超聲波物位計,超聲波水位計,超聲波料位計。是一種常見的非接觸式液位儀表。適合石油、化工、自來水、污水處理、水利水文、鋼鐵、煤礦、電力、交通以及食品加工等行業。它安裝操作簡便,適用性廣,價格低廉。那么,超聲波液位計有哪些優點,安裝時有什么技巧,應該注意哪些問題呢?小編幫大家整理如下:


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:




超聲波液位計安裝


Installation of ultrasonic level gauge




一、超聲波液位計的優缺點


I. Advantages and disadvantages of ultrasonic level gauge


超聲波液位計安裝方便,性能穩定,測量精度高,價格低廉。但是對溫度,粉塵,蒸汽,壓力的影響比較敏感。


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,找準位置


2. Clarify the Principle and Find the Position


超聲波液位計原理:超聲波液位計安裝于容器上部,在電子單元的控制下,探頭向被測物體發射一束超聲波脈沖。聲波被物體表面反射,部分反射回波由探頭接收并轉換為電信號。從超聲波發射到被重新被接收,其時間與探頭至被測物體的距離成正比。電子單元檢測該時間,并根據已知的聲速計算出被測距離。用探頭到罐底的距離-探頭到液位的距離= 實際液位或者物位高度。所以,超聲波液位計應該安裝在容器頂部,對準需要測量的液體表面。


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、現場使用時候的安裝注意事項


III. Installation Notices for Site Use Time


1.垂直安裝探頭


1. Vertical mounting probe


換能器安裝的時候,要保證換能器的發射面和要被探測的液面平行,這樣聲波就可以垂直發射到被測物體表面。這樣可以保證最大的能量返回。


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.


安裝技巧:如果現場環境有蒸汽,容易形成水珠附在探頭的表面,并且探頭的量程比實際要測量的距離大的多。那么可以傾斜3度左右,這樣可以避免水珠結水的影響。


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.避開盲區


2. Avoiding Blind Areas


最高液位到超聲波液位計探頭表面的距離應大于探頭的盲區。


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.


這里需要注意的是:我們的盲區是在比較理想的狀態下測得的。因此如果我們的安裝的是封閉的罐體,那么盲區值最好加大20%。如果因為液體會攪動,用了很長的導管來安裝,那么盲區值最好也加大20%為了避開盲區,我們經常會用加長導管的方式來避開盲區。在利用加長導管安裝的時候,必須保證探頭的銳角度。


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.遠離罐壁和障礙物


3. Away from tank walls and obstacles


如果罐壁是光滑的,并且液位降低的時候,不會出現掛料的情況,那么大部分距離灌壁30cm的距離安裝就可以。如果灌壁是粗糙的,那么探頭安裝的位置要遠離罐壁。罐底不是平面的,那么在零液位的時候可能出現誤差。如果是圓錐型底面,可以考慮把探頭安裝在圓錐頂端正上方。對于圓形的橫桿,只要距離超過1m,直徑不超過5cm,影響不大。否則盡量避開。但對平面的橫桿,罐壁有直角的情況,要盡量的避開。


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.




超聲波液位計現場


On-site ultrasonic level gauge




4.避免攪拌和波動


4. Avoid stirring and fluctuation


如果有攪拌或者波動的場合,可以用加長導管安裝。導管直接申入液位底面。導管的直徑只要大于探頭的輻射面即可,但是要保證導管的內壁光滑,并且液位升降過程中不掛料,管內液體和管外一致。如果大量程不適合用導管安裝的,可以減小量程使用,具體減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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