常規壓力變送器

電容式：

當壓(ya)力(li)直接(jie)作用在測量(liang)膜片的表面(mian)，使(shi)膜片產生微小(xiao)的形變(bian)，測量(liang)膜片上的高精度(du)(du)電路(lu)將這個(ge)微小(xiao)的形變(bian)變(bian)換成(cheng)為與壓(ya)力(li)成(cheng)正比的高度(du)(du)線性、與激(ji)勵電壓(ya)也成(cheng)正比的電壓(ya)信(xin)(xin)號(hao)，然(ran)后采用芯(xin)片將這個(ge)電壓(ya)信(xin)(xin)號(hao)轉換為工業標準的4-20mA電流信(xin)(xin)號(hao)或者(zhe)1-5V電壓(ya)信(xin)(xin)號(hao)。

由于測量(liang)膜片采用標準化集成電(dian)(dian)路，內部(bu)包(bao)含線(xian)性及溫(wen)度補償電(dian)(dian)路，所以可以做(zuo)到(dao)高(gao)精(jing)度和高(gao)穩定性，變送電(dian)(dian)路采用的兩線(xian)制(zhi)芯片，可以保證輸(shu)出(chu)兩線(xian)制(zhi)4-20mA電(dian)(dian)流信號，方便現(xian)場接線(xian)。

擴散硅：

被測介質的(de)(de)壓(ya)力(li)直接作用于傳感器(qi)的(de)(de)膜(mo)片上(不銹鋼或陶瓷)，使膜(mo)片產生(sheng)與(yu)介質壓(ya)力(li)成正比的(de)(de)微位移，使傳感器(qi)的(de)(de)電阻值發(fa)生(sheng)變(bian)化，和用電子線路檢測這一變(bian)化，并轉(zhuan)換輸出一個對應于這一壓(ya)力(li)的(de)(de)標準測量信號。

陶瓷：

壓力直接作(zuo)用在陶瓷膜(mo)片(pian)(pian)的(de)(de)前(qian)表(biao)面，使(shi)膜(mo)片(pian)(pian)產生微(wei)小的(de)(de)形(xing)變，厚膜(mo)電(dian)阻印刷在陶瓷膜(mo)片(pian)(pian)的(de)(de)背面，連(lian)接成(cheng)一(yi)個(ge)惠(hui)斯通電(dian)橋(qiao)(閉橋(qiao))，由于壓敏電(dian)阻的(de)(de)壓阻效應(ying)，使(shi)電(dian)橋(qiao)產生一(yi)個(ge)與(yu)壓力成(cheng)正比的(de)(de)高度線性、與(yu)激勵電(dian)壓也成(cheng)正比的(de)(de)電(dian)壓信(xin)號。

應變(bian)片(pian)式：

電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)(zu)(zu)應(ying)變(bian)(bian)(bian)(bian)(bian)片(pian)(pian)(pian)(pian)是(shi)一(yi)種將被測件上的(de)應(ying)變(bian)(bian)(bian)(bian)(bian)變(bian)(bian)(bian)(bian)(bian)化轉換成為(wei)一(yi)種電(dian)(dian)(dian)信號的(de)敏感器(qi)件。它是(shi)壓阻(zu)(zu)(zu)(zu)(zu)(zu)式應(ying)變(bian)(bian)(bian)(bian)(bian)變(bian)(bian)(bian)(bian)(bian)送器(qi)的(de)主要組成部分之一(yi)。電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)(zu)(zu)應(ying)變(bian)(bian)(bian)(bian)(bian)片(pian)(pian)(pian)(pian)應(ying)用多的(de)是(shi)金屬(shu)電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)(zu)(zu)應(ying)變(bian)(bian)(bian)(bian)(bian)片(pian)(pian)(pian)(pian)和半(ban)導體應(ying)變(bian)(bian)(bian)(bian)(bian)片(pian)(pian)(pian)(pian)兩(liang)種。金屬(shu)電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)(zu)(zu)應(ying)變(bian)(bian)(bian)(bian)(bian)片(pian)(pian)(pian)(pian)又(you)有絲(si)狀應(ying)變(bian)(bian)(bian)(bian)(bian)片(pian)(pian)(pian)(pian)和金屬(shu)箔(bo)狀應(ying)變(bian)(bian)(bian)(bian)(bian)片(pian)(pian)(pian)(pian)兩(liang)種。通常是(shi)將應(ying)變(bian)(bian)(bian)(bian)(bian)片(pian)(pian)(pian)(pian)通過特(te)殊的(de)粘(zhan)和劑緊密的(de)粘(zhan)合在產生力學應(ying)變(bian)(bian)(bian)(bian)(bian)基體上，當(dang)基體受力發(fa)生應(ying)力變(bian)(bian)(bian)(bian)(bian)化時，電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)(zu)(zu)應(ying)變(bian)(bian)(bian)(bian)(bian)片(pian)(pian)(pian)(pian)也一(yi)起產生形變(bian)(bian)(bian)(bian)(bian)，使(shi)(shi)應(ying)變(bian)(bian)(bian)(bian)(bian)片(pian)(pian)(pian)(pian)的(de)阻(zu)(zu)(zu)(zu)(zu)(zu)值發(fa)生改變(bian)(bian)(bian)(bian)(bian)，從而(er)使(shi)(shi)加在電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)(zu)(zu)上的(de)電(dian)(dian)(dian)壓發(fa)生變(bian)(bian)(bian)(bian)(bian)化。

常規壓力變送器技(ji)術參數(shu)：