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PTS21壓力(li)變(bian)(bian)送器(qi) 則(ze)是采用干式(shi)陶(tao)瓷電(dian)(dian)容傳感(gan)器(qi)作為測(ce)量單元。精密(mi)型壓力(li)變(bian)(bian)送器(qi)在測(ce)量時，過程(cheng)壓力(li)直接作用于堅固(gu)耐腐蝕的陶(tao)瓷膜片(pian)上(shang)，使膜片(pian)產生彈性位移(yi)，根據電(dian)(dian)容值的大(da)小(xiao)與兩極間的距(ju)離成(cheng)反比的原理，就可(ke)(ke)以從襯(chen)底電(dian)(dian)極和膜片(pian)電(dian)(dian)極之間檢測(ce)到電(dian)(dian)容的變(bian)(bian)化，檢測(ce)到的變(bian)(bian)化電(dian)(dian)容經微調電(dian)(dian)路放大(da)后，可(ke)(ke)輸出一(yi)個準確(que)的電(dian)(dian)壓信號，輸出的電(dian)(dian)壓信號通過變(bian)(bian)送器(qi)轉換(huan)成(cheng)4~20mA的電(dian)(dian)流信號輸出