金嶺壓(ya)力（含(han)負壓(ya)）變送器

壓力(li)變送器(qi)是(shi)工業實踐中較為常用(yong)的一種(zhong)傳感器(qi)，其廣泛應用(yong)于各種(zhong)工業自控(kong)環境(jing)，涉(she)及(ji)水利水電、鐵(tie)路交通、智(zhi)能(neng)建筑、生產自控(kong)、航空航天、、石(shi)化、油(you)井、電力(li)、船舶、機床、管道等眾(zhong)多(duo)行業。

壓力(li)變送器有電動(dong)式(shi)和氣動(dong)式(shi)兩大類(lei)。電動(dong)式(shi)的(de)統(tong)一輸出信號(hao)為0～10mA、4～20mA或1～5V等直流電信號(hao)。氣動(dong)式(shi)的(de)統(tong)一輸出信號(hao)為20～100Pa的(de)氣體壓力(li)。

壓(ya)(ya)(ya)(ya)力(li)(li)(li)變送(song)器的(de)(de)(de)(de)主要作用(yong)把壓(ya)(ya)(ya)(ya)力(li)(li)(li)信(xin)號傳到(dao)電子設備，進而在計算機顯示(shi)壓(ya)(ya)(ya)(ya)力(li)(li)(li)其原(yuan)理(li)大(da)致(zhi)是(shi)(shi)：將水壓(ya)(ya)(ya)(ya)這種壓(ya)(ya)(ya)(ya)力(li)(li)(li)的(de)(de)(de)(de)力(li)(li)(li)學信(xin)號轉變成(cheng)(cheng)電流(liu)(liu)（4-20mA）這樣的(de)(de)(de)(de)電子信(xin)號壓(ya)(ya)(ya)(ya)力(li)(li)(li)和(he)電壓(ya)(ya)(ya)(ya)或電流(liu)(liu)大(da)小成(cheng)(cheng)線(xian)性關系，一般是(shi)(shi)正比關系。所(suo)以(yi)，變送(song)器輸出的(de)(de)(de)(de)電壓(ya)(ya)(ya)(ya)或電流(liu)(liu)隨(sui)壓(ya)(ya)(ya)(ya)力(li)(li)(li)增大(da)而增大(da)由此(ci)得出一個壓(ya)(ya)(ya)(ya)力(li)(li)(li)和(he)電壓(ya)(ya)(ya)(ya)或電流(liu)(liu)的(de)(de)(de)(de)關系式壓(ya)(ya)(ya)(ya)力(li)(li)(li)變送(song)器的(de)(de)(de)(de)被測介(jie)質的(de)(de)(de)(de)兩種壓(ya)(ya)(ya)(ya)力(li)(li)(li)通入高、低(di)(di)兩壓(ya)(ya)(ya)(ya)力(li)(li)(li)室，低(di)(di)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)或真(zhen)空，作用(yong)在δ元(yuan)（即敏感元(yuan)件）的(de)(de)(de)(de)兩側隔(ge)離膜(mo)片上，通過隔(ge)離片和(he)元(yuan)件內的(de)(de)(de)(de)填充(chong)液傳送(song)到(dao)測量(liang)膜(mo)片兩側

壓(ya)力(li)變送器(qi)是(shi)由測量膜片(pian)與(yu)兩側絕(jue)緣片(pian)上的電(dian)極各組成一個電(dian)容器(qi)。當兩側壓(ya)力(li)不*時，致使測量膜片(pian)產生位(wei)移(yi)(yi)，其位(wei)移(yi)(yi)量和壓(ya)力(li)差成正(zheng)比，故兩側電(dian)容量就不等，通過(guo)振蕩和解調環節(jie)。

工作原理

壓(ya)力(li)變(bian)(bian)(bian)送器感受(shou)壓(ya)力(li)的電(dian)(dian)(dian)器元件一(yi)般為(wei)電(dian)(dian)(dian)阻(zu)(zu)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)片(pian)(pian)，電(dian)(dian)(dian)阻(zu)(zu)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)片(pian)(pian)是一(yi)種(zhong)(zhong)(zhong)將(jiang)被(bei)測件上(shang)(shang)的壓(ya)力(li)轉換成(cheng)為(wei)一(yi)種(zhong)(zhong)(zhong)電(dian)(dian)(dian)信號的敏感器件。電(dian)(dian)(dian)阻(zu)(zu)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)片(pian)(pian)應(ying)(ying)(ying)(ying)用多的是金屬(shu)電(dian)(dian)(dian)阻(zu)(zu)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)片(pian)(pian)和半導體(ti)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)片(pian)(pian)兩(liang)種(zhong)(zhong)(zhong)。金屬(shu)電(dian)(dian)(dian)阻(zu)(zu)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)片(pian)(pian)又有絲狀應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)片(pian)(pian)和金屬(shu)箔狀應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)片(pian)(pian)兩(liang)種(zhong)(zhong)(zhong)。通(tong)常是將(jiang)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)片(pian)(pian)通(tong)過特殊(shu)的黏合(he)劑緊密地粘合(he)在(zai)產生(sheng)力(li)學應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)基體(ti)上(shang)(shang)，當基體(ti)受(shou)力(li)發(fa)生(sheng)應(ying)(ying)(ying)(ying)力(li)變(bian)(bian)(bian)化時，電(dian)(dian)(dian)阻(zu)(zu)應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)片(pian)(pian)也(ye)一(yi)起產生(sheng)形變(bian)(bian)(bian)，使應(ying)(ying)(ying)(ying)變(bian)(bian)(bian)片(pian)(pian)的阻(zu)(zu)值發(fa)生(sheng)改變(bian)(bian)(bian)，從而使加在(zai)電(dian)(dian)(dian)阻(zu)(zu)上(shang)(shang)的電(dian)(dian)(dian)壓(ya)發(fa)生(sheng)變(bian)(bian)(bian)化。

JL-3851GP型(xing)電(dian)容式(shi)壓力(li)變送(song)器（表(biao)壓）測(ce)量小壓力(li)1KPa(可(ke)遷移(yi)為負壓變送(song)器），適用對象液(ye)體(ti)、氣體(ti)、蒸汽。

選型型號

具體(ti)內(nei)容詳見(jian)：金嶺壓力(li)（含負(fu)壓）變送器