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PTS21壓(ya)力變(bian)送(song)(song)器(qi) 則(ze)是(shi)采用(yong)(yong)干式(shi)陶瓷電(dian)(dian)容(rong)(rong)傳感器(qi)作為(wei)測(ce)量單元。精密型壓(ya)力變(bian)送(song)(song)器(qi)在(zai)測(ce)量時，過程壓(ya)力直(zhi)接作用(yong)(yong)于堅固(gu)耐腐蝕的(de)(de)(de)陶瓷膜片上，使膜片產(chan)生彈性位(wei)移，根據電(dian)(dian)容(rong)(rong)值的(de)(de)(de)大小與兩極間(jian)的(de)(de)(de)距離成反比的(de)(de)(de)原理，就可以從襯底電(dian)(dian)極和膜片電(dian)(dian)極之間(jian)檢(jian)測(ce)到電(dian)(dian)容(rong)(rong)的(de)(de)(de)變(bian)化，檢(jian)測(ce)到的(de)(de)(de)變(bian)化電(dian)(dian)容(rong)(rong)經微調(diao)電(dian)(dian)路放大后，可輸(shu)出(chu)一(yi)個準確的(de)(de)(de)電(dian)(dian)壓(ya)信號，輸(shu)出(chu)的(de)(de)(de)電(dian)(dian)壓(ya)信號通過變(bian)送(song)(song)器(qi)轉換成4~20mA的(de)(de)(de)電(dian)(dian)流(liu)信號輸(shu)出(chu)