超聲波式液位計原理要求
超聲波液位計(ji)工(gong)作時，高頻脈(mo)沖(chong)(chong)聲波由換(huan)能(neng)器（探頭）發出，遇被(bei)(bei)測物(wu)體(ti)（水(shui)面(mian)）表面(mian)被(bei)(bei)反(fan)射，折回的(de)(de)反(fan)射回波被(bei)(bei)同一換(huan)能(neng)器（探頭）接(jie)收，轉換(huan)成電信號。脈(mo)沖(chong)(chong)發送和(he)接(jie)收之間的(de)(de)時間（聲波的(de)(de)運動時間）與換(huan)能(neng)器到(dao)物(wu)體(ti)表面(mian)的(de)(de)距(ju)離成正(zheng)比，聲波傳輸(shu)的(de)(de)距(ju)離S與聲速C和(he)傳輸(shu)時間T之間的(de)(de)關系可(ke)以用(yong)公式(shi)表示(shi)：S= CⅩT/2

超聲波式液位計概述：

是一種使(shi)用(yong)超(chao)(chao)聲(sheng)波技術來測(ce)量(liang)液(ye)體或(huo)固體物料的(de)液(ye)位(wei)高度的(de)設備。它通過利(li)用(yong)超(chao)(chao)聲(sheng)波在液(ye)體或(huo)固體表面的(de)反射來測(ce)量(liang)液(ye)位(wei)高度。

通(tong)常(chang)由傳(chuan)(chuan)感(gan)(gan)器(qi)和(he)控(kong)制器(qi)兩(liang)部分(fen)組成。傳(chuan)(chuan)感(gan)(gan)器(qi)通(tong)常(chang)安裝在(zai)容器(qi)頂部或底(di)部，并發(fa)射超聲波信號(hao)。當這些信號(hao)遇到液體(ti)或物料表面時(shi)(shi)，一(yi)部分(fen)能(neng)量將被(bei)反射回傳(chuan)(chuan)感(gan)(gan)器(qi)。傳(chuan)(chuan)感(gan)(gan)器(qi)測量從發(fa)送到接收信號(hao)之(zhi)間(jian)的時(shi)(shi)間(jian)差，然后根(gen)據聲速和(he)時(shi)(shi)間(jian)差計算出(chu)液位的高度(du)。

具有許多優(you)點。首(shou)先，它(ta)適(shi)用于(yu)各種液體(ti)和固(gu)體(ti)物料，包括腐蝕性和粘稠的(de)物質。其次(ci)，它(ta)可以實時監測液位(wei)變化(hua)并(bing)提供準確(que)的(de)測量(liang)結(jie)果。此外，超(chao)聲波液位(wei)計(ji)不受壓力、溫度和振動等環(huan)境變化(hua)的(de)影(ying)響。

是一種可靠且廣泛應用的液位測量技術。它在工業、水處理、化工、食品和飲料等領域中得到廣泛應用，能夠提供準確、實時的液位監測和控制。

安裝超(chao)(chao)聲(sheng)波(bo)液位(wei)(wei)計(ji)(ji)時必(bi)須考慮超(chao)(chao)聲(sheng)波(bo)液位(wei)(wei)計(ji)(ji)的盲區(qu)問(wen)題。當(dang)液位(wei)(wei)進(jin)入盲區(qu)后，超(chao)(chao)聲(sheng)波(bo)變送(song)器就無(wu)法測量液位(wei)(wei)了，所(suo)以在確定超(chao)(chao)聲(sheng)波(bo)液位(wei)(wei)計(ji)(ji)的量程時，必(bi)須留(liu)出50公分的余(yu)量，安裝時，變送(song)器探(tan)頭必(bi)須高(gao)出液位(wei)(wei)50公分左右。這(zhe)樣才(cai)能(neng)保證對液位(wei)(wei)的準確監測及保證超(chao)(chao)聲(sheng)波(bo)液位(wei)(wei)計(ji)(ji)的安全。

可采(cai)(cai)(cai)用(yong)(yong)(yong)二(er)(er)線(xian)(xian)(xian)制、三(san)(san)線(xian)(xian)(xian)制或四(si)(si)線(xian)(xian)(xian)制技術(shu)，二(er)(er)線(xian)(xian)(xian)制為(wei)：供電(dian)(dian)(dian)(dian)(dian)(dian)與(yu)(yu)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)輸(shu)出(chu)共用(yong)(yong)(yong)；三(san)(san)線(xian)(xian)(xian)制為(wei)：供電(dian)(dian)(dian)(dian)(dian)(dian)回(hui)路(lu)(lu)(lu)和(he)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)輸(shu)出(chu)回(hui)路(lu)(lu)(lu)獨立，當(dang)(dang)采(cai)(cai)(cai)用(yong)(yong)(yong)直(zhi)(zhi)流(liu)(liu)24v供電(dian)(dian)(dian)(dian)(dian)(dian)時(shi)(shi)(shi)，可使(shi)(shi)用(yong)(yong)(yong)一(yi)(yi)(yi)根(gen)(gen)3芯(xin)(xin)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)線(xian)(xian)(xian)，供電(dian)(dian)(dian)(dian)(dian)(dian)負(fu)(fu)端(duan)(duan)和(he)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)輸(shu)出(chu)負(fu)(fu)端(duan)(duan)共用(yong)(yong)(yong)一(yi)(yi)(yi)根(gen)(gen)芯(xin)(xin)線(xian)(xian)(xian)；四(si)(si)線(xian)(xian)(xian)制為(wei)：當(dang)(dang)采(cai)(cai)(cai)用(yong)(yong)(yong)交流(liu)(liu)220v供電(dian)(dian)(dian)(dian)(dian)(dian)時(shi)(shi)(shi)，或者當(dang)(dang)采(cai)(cai)(cai)用(yong)(yong)(yong)直(zhi)(zhi)流(liu)(liu)24v供電(dian)(dian)(dian)(dian)(dian)(dian)，要求(qiu)供電(dian)(dian)(dian)(dian)(dian)(dian)回(hui)路(lu)(lu)(lu)與(yu)(yu)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)輸(shu)出(chu)回(hui)路(lu)(lu)(lu)*隔(ge)(ge)離時(shi)(shi)(shi)，應(ying)使(shi)(shi)用(yong)(yong)(yong)一(yi)(yi)(yi)根(gen)(gen)4芯(xin)(xin)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)線(xian)(xian)(xian)。直(zhi)(zhi)流(liu)(liu)或交流(liu)(liu)供電(dian)(dian)(dian)(dian)(dian)(dian)，具(ju)有(you)4~20mADC，高低(di)位開(kai)關量輸(shu)出(chu)。 超聲波液位計可采(cai)(cai)(cai)用(yong)(yong)(yong)二(er)(er)線(xian)(xian)(xian)制、三(san)(san)線(xian)(xian)(xian)制或四(si)(si)線(xian)(xian)(xian)制技術(shu)，二(er)(er)線(xian)(xian)(xian)制為(wei)：供電(dian)(dian)(dian)(dian)(dian)(dian)與(yu)(yu)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)輸(shu)出(chu)共用(yong)(yong)(yong)；三(san)(san)線(xian)(xian)(xian)制為(wei)：供電(dian)(dian)(dian)(dian)(dian)(dian)回(hui)路(lu)(lu)(lu)和(he)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)輸(shu)出(chu)回(hui)路(lu)(lu)(lu)獨立，當(dang)(dang)采(cai)(cai)(cai)用(yong)(yong)(yong)直(zhi)(zhi)流(liu)(liu)24v供電(dian)(dian)(dian)(dian)(dian)(dian)時(shi)(shi)(shi)，可使(shi)(shi)用(yong)(yong)(yong)一(yi)(yi)(yi)根(gen)(gen)3芯(xin)(xin)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)線(xian)(xian)(xian)，供電(dian)(dian)(dian)(dian)(dian)(dian)負(fu)(fu)端(duan)(duan)和(he)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)輸(shu)出(chu)負(fu)(fu)端(duan)(duan)共用(yong)(yong)(yong)一(yi)(yi)(yi)根(gen)(gen)芯(xin)(xin)線(xian)(xian)(xian)；四(si)(si)線(xian)(xian)(xian)制為(wei)：當(dang)(dang)采(cai)(cai)(cai)用(yong)(yong)(yong)交流(liu)(liu)220v供電(dian)(dian)(dian)(dian)(dian)(dian)時(shi)(shi)(shi)，或者當(dang)(dang)采(cai)(cai)(cai)用(yong)(yong)(yong)直(zhi)(zhi)流(liu)(liu)24v供電(dian)(dian)(dian)(dian)(dian)(dian)，要求(qiu)供電(dian)(dian)(dian)(dian)(dian)(dian)回(hui)路(lu)(lu)(lu)與(yu)(yu)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)輸(shu)出(chu)回(hui)路(lu)(lu)(lu)*隔(ge)(ge)離時(shi)(shi)(shi)，應(ying)使(shi)(shi)用(yong)(yong)(yong)一(yi)(yi)(yi)根(gen)(gen)4芯(xin)(xin)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)線(xian)(xian)(xian)。直(zhi)(zhi)流(liu)(liu)或交流(liu)(liu)供電(dian)(dian)(dian)(dian)(dian)(dian)，具(ju)有(you)4~20mADC，高低(di)位開(kai)關量輸(shu)出(chu)。