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電(dian)(dian)(dian)極(ji)(ji)(ji)式(shi)液位開(kai)關是利用(yong)液體的導電(dian)(dian)(dian)特性來(lai)檢(jian)測液位的高低。在液位開(kai)關的電(dian)(dian)(dian)極(ji)(ji)(ji)之間施以一電(dian)(dian)(dian)流(liu)，當介(jie)質(zhi)*浸入電(dian)(dian)(dian)極(ji)(ji)(ji)時(shi)電(dian)(dian)(dian)流(liu)導通，而(er)當沒有介(jie)質(zhi)時(shi)則電(dian)(dian)(dian)極(ji)(ji)(ji)間的電(dian)(dian)(dian)流(liu)形成斷路。液位控制器檢(jian)測到這一信(xin)號并將之放大再輸出(chu)開(kai)關信(xin)號，供使用(yong)者達到檢(jian)測液位的目的。