電(dian)(dian)容(rong)液(ye)體傳(chuan)感(gan)(gan)器(qi)DSW-1和DSW-2系列利(li)用電(dian)(dian)容(rong)原理(li)，當液(ye)體高(gao)度達到傳(chuan)感(gan)(gan)器(qi)接(jie)觸面時會引起電(dian)(dian)容(rong)值(zhi)(zhi)(zhi)變化(hua)，控制器(qi)通(tong)(tong)過(guo)變化(hua)量對比并(bing)轉(zhuan)化(hua)為高(gao)低(di)電(dian)(dian)平或電(dian)(dian)壓(ya)值(zhi)(zhi)(zhi)輸(shu)出(chu)信號(hao)，外部控制板通(tong)(tong)過(guo)檢測(ce)高(gao)低(di)電(dian)(dian)平信號(hao)或不同的電(dian)(dian)壓(ya)值(zhi)(zhi)(zhi)即可判斷對應液(ye)位(wei)高(gao)度。DSW-3系列非接(jie)觸液(ye)位(wei)模組(zu)還集(ji)成了光耦液(ye)位(wei)傳(chuan)感(gan)(gan)器(qi)、液(ye)位(wei)開關的信號(hao)檢測(ce)功能，信號(hao)通(tong)(tong)過(guo)模塊處理(li)后(hou)再一(yi)起輸(shu)出(chu)，減少(shao)連(lian)接(jie)線。