一、電接點壓力表是什么儀表
電(dian)接(jie)點(dian)壓(ya)(ya)力(li)(li)表是壓(ya)(ya)力(li)(li)表的(de)(de)一(yi)種(zhong),它通(tong)過與(yu)繼電(dian)器(qi)(qi)及變(bian)頻(pin)器(qi)(qi)等相應的(de)(de)電(dian)氣器(qi)(qi)件配套使用,可對被測(控(kong)(kong))壓(ya)(ya)力(li)(li)的(de)(de)各(ge)(ge)種(zhong)氣體(ti)與(yu)液體(ti)介質(zhi)經儀表實現自動(dong)控(kong)(kong)制和(he)發信(報(bao)警)的(de)(de)目的(de)(de),多用于石油(you)、化工、冶金、電(dian)站(zhan)、機械等領域,測量各(ge)(ge)種(zhong)流體(ti)介質(zhi)壓(ya)(ya)力(li)(li),比如增壓(ya)(ya)水(shui)罐的(de)(de)水(shui)壓(ya)(ya)控(kong)(kong)制、真空泵的(de)(de)工作壓(ya)(ya)力(li)(li)控(kong)(kong)制、變(bian)壓(ya)(ya)器(qi)(qi)的(de)(de)溫度保(bao)護控(kong)(kong)制等,都(dou)會用到電(dian)接(jie)點(dian)壓(ya)(ya)力(li)(li)表。
二、電接點壓力表的工作原理介紹
電(dian)接點(dian)壓力(li)表(biao)由測量系(xi)統(tong)、指示系(xi)統(tong)、磁助(zhu)電(dian)接點(dian)裝置、外殼、調整裝置和(he)接線盒(插頭座)等部分組(zu)成,其工作原理是:
測(ce)量系統中的彈簧管在被測(ce)介質的壓(ya)力作(zuo)用下(xia),迫使(shi)彈簧管之(zhi)末(mo)端產生(sheng)相(xiang)應的彈性變形(xing)位移,借(jie)助拉桿經齒輪傳(chuan)動機構的傳(chuan)動并(bing)予放大(da),由(you)固定(ding)齒輪上(shang)的指(zhi)示(連同(tong)(tong)觸頭)逐(zhu)將被測(ce)值在度盤(pan)上(shang)指(zhi)示出(chu)來(lai)。與(yu)此同(tong)(tong)時(shi),當(dang)其與(yu)設定(ding)指(zhi)針上(shang)的觸頭(上(shang)限(xian)或下(xia)限(xian))相(xiang)接(jie)觸(動斷或動合),使(shi)控制系統中的電路得以斷開或接(jie)通(tong),從而達到自動控制和發信報(bao)警的目的。
三、電接點壓力表如何接線
電(dian)接點壓力表(biao)有4根接線(xian),顏色一般是紅、黃、綠、黑,要注意(yi)接到(dao)正確的(de)線(xian)上才能正常工作。電(dian)接點壓力表(biao)的(de)接線(xian)方法(fa)有多(duo)種(zhong):
1、標準方法
一般情況下,一個(ge)符合規(gui)范的電(dian)接點壓力(li)表,黃線(xian)(xian)(xian)是公(gong)共(gong)線(xian)(xian)(xian),即電(dian)源線(xian)(xian)(xian);綠線(xian)(xian)(xian)是下限線(xian)(xian)(xian),即啟動(dong)線(xian)(xian)(xian);紅線(xian)(xian)(xian)是上(shang)限線(xian)(xian)(xian),即停止(zhi)線(xian)(xian)(xian);黑線(xian)(xian)(xian)是接地線(xian)(xian)(xian);找到對應(ying)的線(xian)(xian)(xian),將其連接好即可。
2、萬用表測量法
如果這個電接點壓力表不(bu)符合規范,那么就無法通(tong)(tong)(tong)過顏色區(qu)分了(le),這時我們要用(yong)到(dao)(dao)萬(wan)用(yong)表通(tong)(tong)(tong)斷檔(dang)測量(liang)。一般與金屬外殼相連的那根(gen)是地線(xian),這根(gen)線(xian)容易找到(dao)(dao);其他三(san)根(gen)線(xian)用(yong)萬(wan)用(yong)表,把相通(tong)(tong)(tong)的那2根(gen)找出來(lai),不(bu)相通(tong)(tong)(tong)的則是停止線(xian)。
把(ba)地線(xian)(xian)和停止線(xian)(xian)接(jie)好后,把(ba)電(dian)源線(xian)(xian)(即公共(gong)線(xian)(xian))和啟動線(xian)(xian)接(jie)到相通的兩根線(xian)(xian)上,先不管這兩根線(xian)(xian)是(shi)不是(shi)接(jie)顛倒了,把(ba)轉(zhuan)換開關打至自動,通電(dian)試(shi)機(ji),同時(shi)觀(guan)察表壓,如果到了上限壓力就停機(ji),說(shuo)明(ming)(ming)接(jie)線(xian)(xian)正(zheng)確;反(fan)之則說(shuo)明(ming)(ming)接(jie)反(fan)了,兩根線(xian)(xian)互換位置即可。
3、看表針結構接線法
正對著電接點壓力表正面,從外到(dao)里,依(yi)次(ci)是:地線(xian)、電源(yuan)線(xian)、啟動線(xian)、停止線(xian)。
電(dian)接點壓力表(biao)一定(ding)要確保接線正確才能投入使用,不然可能造(zao)成(cheng)嚴重的后果。