壓(ya)力變(bian)送(song)器是一(yi)種把壓(ya)力信(xin)號轉(zhuan)化為(wei)電信(xin)號的(de)儀器，他能把電子(zi)原件感受到的(de)氣體，液體等物(wu)理(li)壓(ya)力參數(shu)，轉(zhuan)化為(wei)電信(xin)號，傳輸(shu)給數(shu)顯表(biao)，報警器或(huo)者PLC進行調節(jie)和控制。

壓力(li)變送器廣泛(fan)的用(yong)于各種工業自(zi)控(kong)環境，涉(she)及(ji)水利水電、鐵路交通、智(zhi)能建筑(zhu)、生產自(zi)控(kong)、航(hang)空航(hang)天、軍工、石(shi)化、油井、電力(li)、船舶、機(ji)床(chuang)、管道(dao)等眾多行業。

壓力(li)變送器是用于測量液(ye)體、氣體或蒸汽的液(ye)位、密度和壓力(li)，然后(hou)將(jiang)壓力(li)信(xin)(xin)號轉變成4～20mA DC信(xin)(xin)號輸出(chu)或0-10號輸出(chu)。

壓(ya)(ya)力(li)(li)(li)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)主要有(you)電容式(shi)壓(ya)(ya)力(li)(li)(li)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)和擴散硅壓(ya)(ya)力(li)(li)(li)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)，陶瓷壓(ya)(ya)力(li)(li)(li)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)，應變(bian)(bian)(bian)式(shi)壓(ya)(ya)力(li)(li)(li)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)等。壓(ya)(ya)力(li)(li)(li)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)根據測壓(ya)(ya)范圍(wei)可分成一般壓(ya)(ya)力(li)(li)(li)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)和微差壓(ya)(ya)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)，負壓(ya)(ya)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)三(san)種(zhong)。

壓(ya)(ya)(ya)(ya)力(li)(li)(li)變送(song)器的(de)主要作用(yong)把壓(ya)(ya)(ya)(ya)力(li)(li)(li)信號傳到電(dian)(dian)(dian)(dian)子設(she)備，進(jin)而(er)(er)在計算機顯示壓(ya)(ya)(ya)(ya)力(li)(li)(li)其原(yuan)理大(da)致是(shi)：將壓(ya)(ya)(ya)(ya)力(li)(li)(li)信號轉變成電(dian)(dian)(dian)(dian)流(liu)(liu)（4-20mA）這樣(yang)的(de)電(dian)(dian)(dian)(dian)子信號壓(ya)(ya)(ya)(ya)力(li)(li)(li)和電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)或(huo)(huo)電(dian)(dian)(dian)(dian)流(liu)(liu)大(da)小(xiao)成線(xian)性(xing)關系(xi)，一般是(shi)正比關系(xi)。所以，變送(song)器輸出(chu)的(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)或(huo)(huo)電(dian)(dian)(dian)(dian)流(liu)(liu)隨壓(ya)(ya)(ya)(ya)力(li)(li)(li)增大(da)而(er)(er)增大(da)由此得(de)出(chu)一個(ge)壓(ya)(ya)(ya)(ya)力(li)(li)(li)和電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)或(huo)(huo)電(dian)(dian)(dian)(dian)流(liu)(liu)的(de)關系(xi)式壓(ya)(ya)(ya)(ya)力(li)(li)(li)變送(song)器的(de)被測介質的(de)兩(liang)種壓(ya)(ya)(ya)(ya)力(li)(li)(li)通入(ru)高、低兩(liang)壓(ya)(ya)(ya)(ya)力(li)(li)(li)室，低壓(ya)(ya)(ya)(ya)室壓(ya)(ya)(ya)(ya)力(li)(li)(li)采用(yong)大(da)氣壓(ya)(ya)(ya)(ya)或(huo)(huo)真(zhen)空，作用(yong)在δ元(yuan)（即敏感元(yuan)件）的(de)兩(liang)側隔離膜(mo)片(pian)上，通過隔離片(pian)和元(yuan)件內的(de)填(tian)充液(ye)傳送(song)到測量膜(mo)片(pian)兩(liang)側。

主要優點：

1、壓力變(bian)送器具有(you)工(gong)作可靠、性能(neng)穩定等特點；

2、V/I集(ji)成電(dian)路，外圍器件少，可靠性高(gao)，維護簡單、輕松(song)，體積小、重量輕，安裝調試極(ji)為方便；

3、鋁合金壓鑄(zhu)外殼，三端隔(ge)離，靜電噴(pen)塑保護層，堅固耐用；

4、4-20mA DC二線制信號傳送，抗(kang)干(gan)擾(rao)能力強，傳輸距離(li)遠；

5、高(gao)準確度(du)(du)，高(gao)穩定性(xing)(xing)。除(chu)進口原裝傳感(gan)器(qi)已用激光修(xiu)正外，對整機在使用溫(wen)度(du)(du)范圍內(nei)的(de)綜(zong)合(he)性(xing)(xing)溫(wen)度(du)(du)漂(piao)移(yi)、非線性(xing)(xing)進行精細(xi)補償。

主要分類：

1、普通壓力變送器

2、防爆壓力變送器

3、差壓變送器

4、中、高溫壓力變(bian)送器(qi)

5、遠傳壓力變送器

工作原理：當壓(ya)(ya)力直接作用在測(ce)量(liang)膜片的(de)表面(mian)，使膜片產生微(wei)小的(de)形變(bian)，測(ce)量(liang)膜片上的(de)高精度(du)(du)電(dian)路將(jiang)這個微(wei)小的(de)形變(bian)變(bian)換成(cheng)為與壓(ya)(ya)力成(cheng)正比(bi)的(de)高度(du)(du)線性、與激(ji)勵電(dian)壓(ya)(ya)也成(cheng)正比(bi)的(de)電(dian)壓(ya)(ya)信(xin)號(hao)，然后采用芯(xin)片將(jiang)這個電(dian)壓(ya)(ya)信(xin)號(hao)轉換為工(gong)業標(biao)準的(de)4-2OmA電(dian)流信(xin)號(hao)或者1-5V電(dian)壓(ya)(ya)信(xin)號(hao)。

由于測量膜片采(cai)用標準(zhun)話集成電路(lu)，內(nei)部包含線(xian)性及溫(wen)度補(bu)償(chang)電路(lu)，所以可以做到高精度和高穩定性，變送電路(lu)采(cai)用的兩(liang)線(xian)制芯片，可以保證輸(shu)出兩(liang)線(xian)制4-2OmA電流信(xin)號(hao)。

主要性能：

1、使用被測介質廣(guang)泛，可測油、水及與316不(bu)銹鋼(gang)和304不(bu)銹鋼(gang)兼(jian)容的糊狀物，具有(you)一定的防腐(fu)能力；

2、高(gao)準(zhun)確度、高(gao)穩(wen)定性(xing)、選用進口原裝傳感器，線性(xing)好，溫度穩(wen)定性(xing)高(gao)；

3、體積小(xiao)、重(zhong)量(liang)輕、安裝、調(diao)試、使用(yong)方便；

4、不銹鋼全封閉(bi)外殼，防水好；

5、壓(ya)力傳感(gan)器直接感(gan)測(ce)(ce)被(bei)測(ce)(ce)液位壓(ya)力，不受介質起泡、沉積的影響。

選(xuan)型注意(yi)事項：量程要正確，信(xin)號要匹配好(hao)，注意(yi)有無防爆防腐和高溫(wen)要求。

安裝注意事項：螺紋連(lian)接處(chu)密(mi)(mi)封(feng)一(yi)定要好(hao)，防(fang)止介質泄露，電線(xian)連(lian)接處(chu)一(yi)定處(chu)理好(hao)，用防(fang)水膠帶(dai)密(mi)(mi)封(feng)好(hao)，不然室外環境下雨時容(rong)易短路