電(dian)(dian)(dian)容(rong)液(ye)體(ti)傳感(gan)器(qi)DSW-1和DSW-2系列利(li)用電(dian)(dian)(dian)容(rong)原理，當液(ye)體(ti)高度達到傳感(gan)器(qi)接(jie)觸(chu)面時會引起電(dian)(dian)(dian)容(rong)值(zhi)(zhi)變化(hua)，控(kong)制(zhi)器(qi)通過變化(hua)量對比并轉化(hua)為高低(di)(di)電(dian)(dian)(dian)平(ping)或電(dian)(dian)(dian)壓(ya)值(zhi)(zhi)輸出信號，外部控(kong)制(zhi)板通過檢測高低(di)(di)電(dian)(dian)(dian)平(ping)信號或不(bu)同的電(dian)(dian)(dian)壓(ya)值(zhi)(zhi)即可判斷對應液(ye)位高度。DSW-3系列非接(jie)觸(chu)液(ye)位模組(zu)還集(ji)成(cheng)了光耦(ou)液(ye)位傳感(gan)器(qi)、液(ye)位開關的信號檢測功能，信號通過模塊處理后(hou)再一(yi)起輸出，減少連接(jie)線。