超聲波液位計特征

原理要求
超聲(sheng)(sheng)波(bo)液位計工(gong)作(zuo)時(shi)(shi)，高頻(pin)脈沖聲(sheng)(sheng)波(bo)由(you)換能器(qi)（探頭(tou)）發出，遇被(bei)測物(wu)體（水面）表(biao)面被(bei)反(fan)射(she)，折(zhe)回的(de)反(fan)射(she)回波(bo)被(bei)同一換能器(qi)（探頭(tou)）接收(shou)，轉換成電信(xin)號。脈沖發送和接收(shou)之間的(de)時(shi)(shi)間（聲(sheng)(sheng)波(bo)的(de)運動時(shi)(shi)間）與換能器(qi)到物(wu)體表(biao)面的(de)距離成正比，聲(sheng)(sheng)波(bo)傳輸的(de)距離S與聲(sheng)(sheng)速(su)C和傳輸時(shi)(shi)間T之間的(de)關(guan)系可以用(yong)公式表(biao)示：S= CⅩT/2

安(an)裝(zhuang)超聲波(bo)液(ye)位(wei)計(ji)時必(bi)(bi)須考慮超聲波(bo)液(ye)位(wei)計(ji)的(de)盲(mang)區(qu)問(wen)題。當液(ye)位(wei)進入盲(mang)區(qu)后，超聲波(bo)變送器就無法測量液(ye)位(wei)了，所以在確(que)定超聲波(bo)液(ye)位(wei)計(ji)的(de)量程時，必(bi)(bi)須留出50公(gong)分(fen)的(de)余(yu)量，安(an)裝(zhuang)時，變送器探(tan)頭必(bi)(bi)須高(gao)出液(ye)位(wei)50公(gong)分(fen)左(zuo)右。這樣才(cai)能保證對(dui)液(ye)位(wei)的(de)準確(que)監測及保證超聲波(bo)液(ye)位(wei)計(ji)的(de)安(an)全。

可(ke)采用二線(xian)(xian)(xian)制(zhi)(zhi)、三線(xian)(xian)(xian)制(zhi)(zhi)或(huo)四線(xian)(xian)(xian)制(zhi)(zhi)技(ji)術(shu)，二線(xian)(xian)(xian)制(zhi)(zhi)為(wei)：供(gong)電(dian)(dian)(dian)(dian)與信(xin)號輸出共用；三線(xian)(xian)(xian)制(zhi)(zhi)為(wei)：供(gong)電(dian)(dian)(dian)(dian)回路和信(xin)號輸出回路獨立，當采用直(zhi)流(liu)(liu)(liu)24v供(gong)電(dian)(dian)(dian)(dian)時(shi)，可(ke)使(shi)用一根3芯電(dian)(dian)(dian)(dian)纜(lan)(lan)線(xian)(xian)(xian)，供(gong)電(dian)(dian)(dian)(dian)負端和信(xin)號輸出負端共用一根芯線(xian)(xian)(xian)；四線(xian)(xian)(xian)制(zhi)(zhi)為(wei)：當采用交流(liu)(liu)(liu)220v供(gong)電(dian)(dian)(dian)(dian)時(shi)，或(huo)者當采用直(zhi)流(liu)(liu)(liu)24v供(gong)電(dian)(dian)(dian)(dian)，要求供(gong)電(dian)(dian)(dian)(dian)回路與信(xin)號輸出回路*隔離時(shi)，應使(shi)用一根4芯電(dian)(dian)(dian)(dian)纜(lan)(lan)線(xian)(xian)(xian)。直(zhi)流(liu)(liu)(liu)或(huo)交流(liu)(liu)(liu)供(gong)電(dian)(dian)(dian)(dian)，具(ju)有(you)4~20mADC，高低位開關量輸出。

超聲波液位計特征

　　超聲波(bo)液位計可采(cai)(cai)用(yong)二(er)線(xian)(xian)制、三(san)(san)線(xian)(xian)制或四線(xian)(xian)制技術，二(er)線(xian)(xian)制為：供(gong)(gong)電(dian)(dian)(dian)(dian)與(yu)信(xin)號(hao)輸出(chu)(chu)共用(yong)；三(san)(san)線(xian)(xian)制為：供(gong)(gong)電(dian)(dian)(dian)(dian)回(hui)路(lu)和(he)信(xin)號(hao)輸出(chu)(chu)回(hui)路(lu)獨立，當(dang)(dang)(dang)采(cai)(cai)用(yong)直流24v供(gong)(gong)電(dian)(dian)(dian)(dian)時(shi)，可使用(yong)一(yi)根(gen)(gen)3芯電(dian)(dian)(dian)(dian)纜線(xian)(xian)，供(gong)(gong)電(dian)(dian)(dian)(dian)負(fu)端(duan)和(he)信(xin)號(hao)輸出(chu)(chu)負(fu)端(duan)共用(yong)一(yi)根(gen)(gen)芯線(xian)(xian)；四線(xian)(xian)制為：當(dang)(dang)(dang)采(cai)(cai)用(yong)交(jiao)(jiao)流220v供(gong)(gong)電(dian)(dian)(dian)(dian)時(shi)，或者(zhe)當(dang)(dang)(dang)采(cai)(cai)用(yong)直流24v供(gong)(gong)電(dian)(dian)(dian)(dian)，要求(qiu)供(gong)(gong)電(dian)(dian)(dian)(dian)回(hui)路(lu)與(yu)信(xin)號(hao)輸出(chu)(chu)回(hui)路(lu)*隔離時(shi)，應使用(yong)一(yi)根(gen)(gen)4芯電(dian)(dian)(dian)(dian)纜線(xian)(xian)。直流或交(jiao)(jiao)流供(gong)(gong)電(dian)(dian)(dian)(dian)，具(ju)有(you)4~20mADC，高低(di)位開關量(liang)輸出(chu)(chu)。

　　量程范圍：0-50米，多種形式可選，適合(he)各種腐蝕性、化工類(lei)場合(he)，精(jing)度(du)高，遠傳信號(hao)輸出，PLC系(xi)統監(jian)控。