金嶺(ling)壓力（含負壓）變送器

壓力變送器是工業(ye)實踐中較為常用的一種(zhong)傳感器，其(qi)廣泛應用于各種(zhong)工業(ye)自(zi)控(kong)環境，涉及水(shui)利水(shui)電(dian)、鐵(tie)路交通、智(zhi)能(neng)建筑(zhu)、生(sheng)產自(zi)控(kong)、航(hang)空航(hang)天、、石化、油井、電(dian)力、船舶、機(ji)床、管道等眾(zhong)多行業(ye)。

壓力變送器有(you)電動式和氣(qi)動式兩大類。電動式的(de)(de)統一輸出(chu)信號為0～10mA、4～20mA或1～5V等直流電信號。氣(qi)動式的(de)(de)統一輸出(chu)信號為20～100Pa的(de)(de)氣(qi)體壓力。

壓(ya)(ya)(ya)(ya)力(li)變(bian)(bian)送器的(de)(de)(de)主要作(zuo)用(yong)把壓(ya)(ya)(ya)(ya)力(li)信號(hao)傳(chuan)到電(dian)(dian)(dian)子設備，進而(er)在(zai)計算機顯示壓(ya)(ya)(ya)(ya)力(li)其(qi)原(yuan)理大(da)致是：將水壓(ya)(ya)(ya)(ya)這(zhe)種壓(ya)(ya)(ya)(ya)力(li)的(de)(de)(de)力(li)學信號(hao)轉變(bian)(bian)成電(dian)(dian)(dian)流（4-20mA）這(zhe)樣的(de)(de)(de)電(dian)(dian)(dian)子信號(hao)壓(ya)(ya)(ya)(ya)力(li)和電(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)或(huo)(huo)電(dian)(dian)(dian)流大(da)小成線性關系(xi)，一(yi)般是正比關系(xi)。所(suo)以，變(bian)(bian)送器輸出(chu)的(de)(de)(de)電(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)或(huo)(huo)電(dian)(dian)(dian)流隨壓(ya)(ya)(ya)(ya)力(li)增(zeng)大(da)而(er)增(zeng)大(da)由此得(de)出(chu)一(yi)個壓(ya)(ya)(ya)(ya)力(li)和電(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)或(huo)(huo)電(dian)(dian)(dian)流的(de)(de)(de)關系(xi)式壓(ya)(ya)(ya)(ya)力(li)變(bian)(bian)送器的(de)(de)(de)被(bei)測(ce)介質(zhi)的(de)(de)(de)兩(liang)(liang)種壓(ya)(ya)(ya)(ya)力(li)通入(ru)高、低兩(liang)(liang)壓(ya)(ya)(ya)(ya)力(li)室，低壓(ya)(ya)(ya)(ya)室壓(ya)(ya)(ya)(ya)力(li)采用(yong)大(da)氣壓(ya)(ya)(ya)(ya)或(huo)(huo)真空，作(zuo)用(yong)在(zai)δ元（即敏感元件(jian)）的(de)(de)(de)兩(liang)(liang)側隔離膜片上，通過隔離片和元件(jian)內的(de)(de)(de)填(tian)充液傳(chuan)送到測(ce)量膜片兩(liang)(liang)側

壓力(li)變送器(qi)是由測量(liang)膜片(pian)(pian)與兩(liang)(liang)側(ce)絕(jue)緣片(pian)(pian)上的電極各組成一個(ge)電容器(qi)。當兩(liang)(liang)側(ce)壓力(li)不*時，致使測量(liang)膜片(pian)(pian)產生位移，其位移量(liang)和(he)壓力(li)差成正(zheng)比(bi)，故兩(liang)(liang)側(ce)電容量(liang)就不等，通過振蕩和(he)解調環節。

工作原理

壓(ya)(ya)力(li)(li)變(bian)(bian)(bian)送器感(gan)受(shou)(shou)壓(ya)(ya)力(li)(li)的(de)(de)(de)電(dian)(dian)器元(yuan)件(jian)一般(ban)為電(dian)(dian)阻(zu)應(ying)(ying)(ying)變(bian)(bian)(bian)片，電(dian)(dian)阻(zu)應(ying)(ying)(ying)變(bian)(bian)(bian)片是一種(zhong)將被(bei)測(ce)件(jian)上的(de)(de)(de)壓(ya)(ya)力(li)(li)轉換成為一種(zhong)電(dian)(dian)信號的(de)(de)(de)敏感(gan)器件(jian)。電(dian)(dian)阻(zu)應(ying)(ying)(ying)變(bian)(bian)(bian)片應(ying)(ying)(ying)用多的(de)(de)(de)是金屬電(dian)(dian)阻(zu)應(ying)(ying)(ying)變(bian)(bian)(bian)片和半導體(ti)(ti)應(ying)(ying)(ying)變(bian)(bian)(bian)片兩(liang)種(zhong)。金屬電(dian)(dian)阻(zu)應(ying)(ying)(ying)變(bian)(bian)(bian)片又有(you)絲狀(zhuang)應(ying)(ying)(ying)變(bian)(bian)(bian)片和金屬箔狀(zhuang)應(ying)(ying)(ying)變(bian)(bian)(bian)片兩(liang)種(zhong)。通常(chang)是將應(ying)(ying)(ying)變(bian)(bian)(bian)片通過(guo)特殊的(de)(de)(de)黏合(he)劑緊密地(di)粘(zhan)合(he)在(zai)產生(sheng)力(li)(li)學(xue)應(ying)(ying)(ying)變(bian)(bian)(bian)基體(ti)(ti)上，當(dang)基體(ti)(ti)受(shou)(shou)力(li)(li)發(fa)生(sheng)應(ying)(ying)(ying)力(li)(li)變(bian)(bian)(bian)化(hua)時，電(dian)(dian)阻(zu)應(ying)(ying)(ying)變(bian)(bian)(bian)片也一起產生(sheng)形變(bian)(bian)(bian)，使應(ying)(ying)(ying)變(bian)(bian)(bian)片的(de)(de)(de)阻(zu)值發(fa)生(sheng)改(gai)變(bian)(bian)(bian)，從(cong)而使加(jia)在(zai)電(dian)(dian)阻(zu)上的(de)(de)(de)電(dian)(dian)壓(ya)(ya)發(fa)生(sheng)變(bian)(bian)(bian)化(hua)。

JL-3851GP型(xing)電(dian)容式壓(ya)力變(bian)送器(qi)（表壓(ya)）測量小壓(ya)力1KPa(可遷(qian)移為負壓(ya)變(bian)送器(qi)），適用對象液體、氣體、蒸汽。

選(xuan)型型號(hao)

具體內(nei)容詳見：金嶺壓(ya)力（含負壓(ya)）變送器