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靜壓式液位變送器測量偏差改進措施
網址: 發布者:admin 發布時間: 閱讀:4110

靜壓式液位變送器由于其使用簡單、精度高、安裝維護簡便等特點,在石化,電力,冶金,環保等行業得到了廣泛應用。但是在實際使用過程中由于某些原因導致測量誤差偏大,影響了這種測量原理儀表的使用。
Static pressure type liquid level transmitter because of its use of simple, high precision, easy installation and maintenance characteristics, in the petrochemical, electric power, metallurgy, environmental protection and other industries has been widely applied. But in actual use because of some causes of measurement error, affected the use of this instrument measuring principle.
  由于工程的循環水為水庫存水,水中含大量的微生物、藻類,并且其中富含大量的氣體。在水的循環過程中,時刻在釋放水中的氣體,由于本工程設計單位采用的是投入式的靜壓式液位變送器,膜片在變送器本體,投入水中的只是一段不銹鋼短管及引壓管,該管路中存在比較大的可積存氣體的空間,當水中的氣體釋放并進入該管路中并慢慢積累,使管內氣體壓力p慢慢增加,抵消了水的高度產生的壓力,致使作用在膜片上的壓力P減小,從而使變送器輸出量減小。
The circulation water engineering for the reservoir water storage, water containing microorganisms, algae, and which is rich in a lot of gas. In the water cycle, time in the gas release water, because the engineering design unit is used in static pressure type liquid level transmitter type, diaphragm in the transmitter body, into the water is a stainless steel tube and pressure guiding pipe, the existence of relatively large up the gas pipeline in space, when water gas release and enter the pipeline and slowly accumulated, so that the tube gas pressure P slowly increased, offsetting the height of water pressure, the pressure of P acting on the diaphragm is reduced, so that the transmitter output decreases.
  我們分析了誤差產生的原因,并且由于靜壓式液位變送器不能完全消除誤差產生的原因,故不再采用該原理的液位測量儀表。我們在循環泵房前池選用了非接觸式的超聲波液位變送器。經過長時間試運行,循環泵房的前池液位測量準確,未再發生周期性測量偏差。可以認為本次改進措施是可行的,成功的。循環泵入口的液位測量儀表的更換將在以后的改進中實施。
We analyzed the causes of error, and the static pressure type liquid level transmitter does not completely eliminate the error, it is no longer used the principle of liquid level measuring instrument. We in the circulating pump house forebay used non-contact ultrasonic level transmitter. After a long time of trial operation, measurement of tank level circulation pump is accurate, no recurrence of periodic measurement deviation. You can believe that the measures are feasible, successful. The replacement of liquid level measurement instrument of circulating pump entrance will be improved in the future.
 
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