一、差壓變送器可以用來測量什么

差壓變送器是負(fu)反饋工(gong)作原理的產物，是自平衡(heng)檢測儀(yi)表(biao)的代表(biao)，采用新生(sheng)(sheng)產技術，克服了(le)元件(jian)在材料，生(sheng)(sheng)產工(gong)藝上面的不利因素，密封(feng)性強(qiang)，可有效防止測量介質進入儀(yi)表(biao)內，對儀(yi)表(biao)造成損壞或者影(ying)響測量效果(guo)，輸出標準信號(hao)，可測量液，氣，蒸汽等介質的液位與流量，壓力(li)。

二、差壓變送器如何測量液位

前文已經簡單了解到了差壓變送(song)器可以用來測量(liang)液(ye)位，那么具體的(de)差壓變送(song)器如何測量(liang)液(ye)位呢？

差壓(ya)(ya)變(bian)送器(qi)(qi)通常用于測量(liang)密閉容器(qi)(qi)內(nei)的(de)(de)液(ye)(ye)位(wei)(wei)，利用液(ye)(ye)體自身重力(li)產生的(de)(de)壓(ya)(ya)力(li)差來測量(liang)容器(qi)(qi)內(nei)液(ye)(ye)體的(de)(de)液(ye)(ye)位(wei)(wei)。其高壓(ya)(ya)側(ce)測量(liang)管(guan)由于蒸汽凝結(jie)，始終處于充滿水狀態，保持(chi)壓(ya)(ya)力(li)恒定(ding)，而低(di)壓(ya)(ya)側(ce)測量(liang)管(guan)與容器(qi)(qi)組(zu)成聯(lian)通器(qi)(qi)，其壓(ya)(ya)力(li)隨容器(qi)(qi)內(nei)液(ye)(ye)位(wei)(wei)的(de)(de)變(bian)化(hua)成線性變(bian)化(hua)。

差壓(ya)(ya)(ya)(ya)變(bian)(bian)送(song)(song)(song)器測(ce)量液位(wei)(wei)時，零位(wei)(wei)的(de)(de)設置是非常重(zhong)要的(de)(de)環(huan)節。當變(bian)(bian)送(song)(song)(song)器的(de)(de)高壓(ya)(ya)(ya)(ya)（H）側(ce)、低壓(ya)(ya)(ya)(ya)（L）側(ce)與(yu)就地測(ce)量筒的(de)(de)高壓(ya)(ya)(ya)(ya)側(ce)、低壓(ya)(ya)(ya)(ya)側(ce)連接一致時，高壓(ya)(ya)(ya)(ya)側(ce)導壓(ya)(ya)(ya)(ya)管始終(zhong)處于充滿水狀態，變(bian)(bian)送(song)(song)(song)器高壓(ya)(ya)(ya)(ya)端測(ce)得壓(ya)(ya)(ya)(ya)力為(wei)P+kPa，變(bian)(bian)送(song)(song)(song)器的(de)(de)低壓(ya)(ya)(ya)(ya)側(ce)與(yu)低壓(ya)(ya)(ya)(ya)側(ce)導壓(ya)(ya)(ya)(ya)管相(xiang)連，測(ce)得壓(ya)(ya)(ya)(ya)力為(wei)P-kPa，則變(bian)(bian)送(song)(song)(song)器測(ce)得實際(ji)差壓(ya)(ya)(ya)(ya)為(wei)（P+-P-）kPa。