一、差壓變送器可以用來測量什么
差壓變送器是負反饋工(gong)作(zuo)原理的產物,是自平衡檢(jian)測(ce)(ce)儀表的代表,采用(yong)新生(sheng)產技術(shu),克(ke)服了(le)元件(jian)在材料(liao),生(sheng)產工(gong)藝上面的不利因素,密封(feng)性強,可(ke)有(you)效(xiao)防止測(ce)(ce)量介質進(jin)入儀表內,對儀表造成損壞或者影響測(ce)(ce)量效(xiao)果,輸出標(biao)準信(xin)號(hao),可(ke)測(ce)(ce)量液,氣,蒸汽等介質的液位與流量,壓力。
二、差壓變送器如何測量液位
前文已(yi)經簡單了解(jie)到了差壓變(bian)送(song)器可以用來測量(liang)液(ye)(ye)位,那么具體的差壓變(bian)送(song)器如何測量(liang)液(ye)(ye)位呢?
差壓(ya)變(bian)送器(qi)通常用于測(ce)量(liang)(liang)密(mi)閉容器(qi)內(nei)的液位,利(li)用液體(ti)自身重力(li)產生的壓(ya)力(li)差來測(ce)量(liang)(liang)容器(qi)內(nei)液體(ti)的液位。其高壓(ya)側(ce)(ce)測(ce)量(liang)(liang)管(guan)由于蒸汽凝結(jie),始終處(chu)于充滿(man)水狀態,保持壓(ya)力(li)恒定(ding),而低(di)壓(ya)側(ce)(ce)測(ce)量(liang)(liang)管(guan)與容器(qi)組成(cheng)聯通器(qi),其壓(ya)力(li)隨容器(qi)內(nei)液位的變(bian)化(hua)(hua)成(cheng)線性變(bian)化(hua)(hua)。
差(cha)壓(ya)(ya)(ya)(ya)變送(song)(song)器(qi)(qi)測(ce)量(liang)液位時,零(ling)位的(de)設置(zhi)是非常重要的(de)環節。當變送(song)(song)器(qi)(qi)的(de)高(gao)壓(ya)(ya)(ya)(ya)(H)側(ce)(ce)、低壓(ya)(ya)(ya)(ya)(L)側(ce)(ce)與就(jiu)地測(ce)量(liang)筒的(de)高(gao)壓(ya)(ya)(ya)(ya)側(ce)(ce)、低壓(ya)(ya)(ya)(ya)側(ce)(ce)連接一(yi)致(zhi)時,高(gao)壓(ya)(ya)(ya)(ya)側(ce)(ce)導(dao)壓(ya)(ya)(ya)(ya)管(guan)始(shi)終(zhong)處于(yu)充滿水狀態(tai),變送(song)(song)器(qi)(qi)高(gao)壓(ya)(ya)(ya)(ya)端測(ce)得(de)壓(ya)(ya)(ya)(ya)力為(wei)(wei)P+kPa,變送(song)(song)器(qi)(qi)的(de)低壓(ya)(ya)(ya)(ya)側(ce)(ce)與低壓(ya)(ya)(ya)(ya)側(ce)(ce)導(dao)壓(ya)(ya)(ya)(ya)管(guan)相連,測(ce)得(de)壓(ya)(ya)(ya)(ya)力為(wei)(wei)P-kPa,則變送(song)(song)器(qi)(qi)測(ce)得(de)實際差(cha)壓(ya)(ya)(ya)(ya)為(wei)(wei)(P+-P-)kPa。