電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)式液(ye)(ye)位計(ji)(ji)(ji)是(shi)采用測(ce)(ce)量(liang)(liang)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)的(de)(de)(de)(de)變(bian)化(hua)(hua)來測(ce)(ce)量(liang)(liang)液(ye)(ye)面(mian)的(de)(de)(de)(de)高(gao)低的(de)(de)(de)(de)。它是(shi)一(yi)根金(jin)屬(shu)棒插(cha)入盛液(ye)(ye)容(rong)(rong)(rong)(rong)器內,金(jin)屬(shu)棒作(zuo)為電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)的(de)(de)(de)(de)一(yi)個極,容(rong)(rong)(rong)(rong)器壁作(zuo)為電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)的(de)(de)(de)(de)另一(yi)極。兩電(dian)(dian)(dian)(dian)極間(jian)的(de)(de)(de)(de)介質(zhi)即為液(ye)(ye)體(ti)及其(qi)上面(mian)的(de)(de)(de)(de)氣體(ti)。由于液(ye)(ye)體(ti)的(de)(de)(de)(de)介電(dian)(dian)(dian)(dian)常(chang)(chang)數(shu)ε1和液(ye)(ye)面(mian)上的(de)(de)(de)(de)介電(dian)(dian)(dian)(dian)常(chang)(chang)數(shu)ε2不同,比如:ε1ε2,則當(dang)液(ye)(ye)位升高(gao)時,電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)式液(ye)(ye)位計(ji)(ji)(ji)兩電(dian)(dian)(dian)(dian)極間(jian)總(zong)的(de)(de)(de)(de)介電(dian)(dian)(dian)(dian)常(chang)(chang)數(shu)值(zhi)(zhi)隨(sui)之加大(da)因(yin)而電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)量(liang)(liang)增大(da)。反之當(dang)液(ye)(ye)位下降(jiang),ε值(zhi)(zhi)減小(xiao),電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)量(liang)(liang)也減小(xiao)。所以(yi)(yi),電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)式液(ye)(ye)位計(ji)(ji)(ji)可通過兩電(dian)(dian)(dian)(dian)極間(jian)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)量(liang)(liang)的(de)(de)(de)(de)變(bian)化(hua)(hua)來測(ce)(ce)量(liang)(liang)液(ye)(ye)位的(de)(de)(de)(de)高(gao)低。電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)液(ye)(ye)位計(ji)(ji)(ji)的(de)(de)(de)(de)靈敏度主(zhu)要取決(jue)于兩種(zhong)介電(dian)(dian)(dian)(dian)常(chang)(chang)數(shu)的(de)(de)(de)(de)差(cha)值(zhi)(zhi),而且,只(zhi)有(you)ε1和ε2的(de)(de)(de)(de)恒(heng)定才(cai)能保(bao)證(zheng)液(ye)(ye)位測(ce)(ce)量(liang)(liang)準確,因(yin)被測(ce)(ce)介質(zhi)具(ju)有(you)導電(dian)(dian)(dian)(dian)性(xing),所以(yi)(yi)金(jin)屬(shu)棒電(dian)(dian)(dian)(dian)極都有(you)絕緣(yuan)層覆蓋。電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)液(ye)(ye)位計(ji)(ji)(ji)體(ti)積小(xiao),容(rong)(rong)(rong)(rong)易實現遠傳和調節,適用于具(ju)有(you)腐(fu)蝕性(xing)和高(gao)壓的(de)(de)(de)(de)介質(zhi)的(de)(de)(de)(de)液(ye)(ye)位測(ce)(ce)量(liang)(liang)。”
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