電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)式(shi)液(ye)位(wei)(wei)計是(shi)采用測(ce)(ce)(ce)量(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)的(de)(de)(de)(de)變(bian)化來測(ce)(ce)(ce)量(liang)(liang)液(ye)面的(de)(de)(de)(de)高低的(de)(de)(de)(de)。它是(shi)一根金(jin)屬棒插入盛液(ye)容(rong)器內,金(jin)屬棒作(zuo)為電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)的(de)(de)(de)(de)一個(ge)極,容(rong)器壁作(zuo)為電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)的(de)(de)(de)(de)另(ling)一極。兩(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)極間的(de)(de)(de)(de)介(jie)質(zhi)(zhi)即(ji)為液(ye)體(ti)及其上(shang)面的(de)(de)(de)(de)氣體(ti)。由于(yu)液(ye)體(ti)的(de)(de)(de)(de)介(jie)電(dian)(dian)(dian)(dian)(dian)(dian)常數(shu)(shu)(shu)ε1和(he)液(ye)面上(shang)的(de)(de)(de)(de)介(jie)電(dian)(dian)(dian)(dian)(dian)(dian)常數(shu)(shu)(shu)ε2不同,比如:ε1ε2,則當液(ye)位(wei)(wei)升高時,電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)式(shi)液(ye)位(wei)(wei)計兩(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)極間總的(de)(de)(de)(de)介(jie)電(dian)(dian)(dian)(dian)(dian)(dian)常數(shu)(shu)(shu)值隨之(zhi)加(jia)大因而電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)量(liang)(liang)增大。反之(zhi)當液(ye)位(wei)(wei)下降,ε值減(jian)小(xiao),電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)量(liang)(liang)也減(jian)小(xiao)。所(suo)以(yi),電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)式(shi)液(ye)位(wei)(wei)計可通(tong)過兩(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)極間的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)量(liang)(liang)的(de)(de)(de)(de)變(bian)化來測(ce)(ce)(ce)量(liang)(liang)液(ye)位(wei)(wei)的(de)(de)(de)(de)高低。電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)液(ye)位(wei)(wei)計的(de)(de)(de)(de)靈(ling)敏度主要取(qu)決于(yu)兩(liang)(liang)種介(jie)電(dian)(dian)(dian)(dian)(dian)(dian)常數(shu)(shu)(shu)的(de)(de)(de)(de)差值,而且,只有ε1和(he)ε2的(de)(de)(de)(de)恒定才能保證液(ye)位(wei)(wei)測(ce)(ce)(ce)量(liang)(liang)準確(que),因被測(ce)(ce)(ce)介(jie)質(zhi)(zhi)具有導電(dian)(dian)(dian)(dian)(dian)(dian)性,所(suo)以(yi)金(jin)屬棒電(dian)(dian)(dian)(dian)(dian)(dian)極都有絕緣層覆蓋。電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)液(ye)位(wei)(wei)計體(ti)積小(xiao),容(rong)易實(shi)現(xian)遠(yuan)傳和(he)調節(jie),適用于(yu)具有腐蝕性和(he)高壓(ya)的(de)(de)(de)(de)介(jie)質(zhi)(zhi)的(de)(de)(de)(de)液(ye)位(wei)(wei)測(ce)(ce)(ce)量(liang)(liang)。”
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