天康在線超聲波液位計

可(ke)采(cai)用(yong)(yong)(yong)二線(xian)(xian)制(zhi)(zhi)、三線(xian)(xian)制(zhi)(zhi)或(huo)四(si)線(xian)(xian)制(zhi)(zhi)技(ji)術，二線(xian)(xian)制(zhi)(zhi)為：供(gong)(gong)(gong)(gong)電(dian)與信號(hao)(hao)輸(shu)出(chu)共用(yong)(yong)(yong)；三線(xian)(xian)制(zhi)(zhi)為：供(gong)(gong)(gong)(gong)電(dian)回路(lu)(lu)和(he)信號(hao)(hao)輸(shu)出(chu)回路(lu)(lu)獨立，當(dang)采(cai)用(yong)(yong)(yong)直流(liu)24v供(gong)(gong)(gong)(gong)電(dian)時(shi)，可(ke)使(shi)用(yong)(yong)(yong)一(yi)(yi)根(gen)3芯(xin)電(dian)纜線(xian)(xian)，供(gong)(gong)(gong)(gong)電(dian)負(fu)端和(he)信號(hao)(hao)輸(shu)出(chu)負(fu)端共用(yong)(yong)(yong)一(yi)(yi)根(gen)芯(xin)線(xian)(xian)；四(si)線(xian)(xian)制(zhi)(zhi)為：當(dang)采(cai)用(yong)(yong)(yong)交流(liu)220v供(gong)(gong)(gong)(gong)電(dian)時(shi)，或(huo)者當(dang)采(cai)用(yong)(yong)(yong)直流(liu)24v供(gong)(gong)(gong)(gong)電(dian)，要求(qiu)供(gong)(gong)(gong)(gong)電(dian)回路(lu)(lu)與信號(hao)(hao)輸(shu)出(chu)回路(lu)(lu)*隔離時(shi)，應使(shi)用(yong)(yong)(yong)一(yi)(yi)根(gen)4芯(xin)電(dian)纜線(xian)(xian)。直流(liu)或(huo)交流(liu)供(gong)(gong)(gong)(gong)電(dian)，具有4~20mADC，高低位開關量輸(shu)出(chu)。

天康在線超聲波液位計

超聲波液位計是由微處理器控制的數字液位儀表。在測量中超聲波脈沖由傳感器（換能器）發出，聲波經液體表面反射后被同一傳感器接收或超聲波接收器，通過壓電晶體或磁致伸縮器件轉換成電信號，并由聲波的發射和接收之間的時間來計算傳感器到被測液體表面的距離。

機械安(an)裝(zhuang)時應(ying)(ying)注意：安(an)裝(zhuang)應(ying)(ying)垂直于(yu)(yu)測是物(wu)表面，避免用于(yu)(yu)測量(liang)(liang)泡沫性質物(wu)體(ti)，避免安(an)裝(zhuang)于(yu)(yu)距測量(liang)(liang)物(wu)體(ti)表面距離小于(yu)(yu)盲區距離（盲區：每臺產品會有一個標準，隨產品得知(zhi)），應(ying)(ying)考(kao)慮束避開陰擋物(wu)質不與(yu)灌口(kou)和(he)容器壁相遇(yu)，檢測大塊固體(ti)物(wu)應(ying)(ying)調整(zheng)探頭方位(wei)，減少(shao)測量(liang)(liang)誤差原理要求

超聲波(bo)液位計工(gong)作時，高頻脈沖聲波(bo)由換(huan)能器(qi)（探(tan)頭）發出，遇被測物體(ti)(ti)（水面）表面被反射，折(zhe)回(hui)的反射回(hui)波(bo)被同一換(huan)能器(qi)（探(tan)頭）接收，轉換(huan)成(cheng)電信號。脈沖發送和(he)接收之(zhi)間(jian)的時間(jian)（聲波(bo)的運動時間(jian)）與換(huan)能器(qi)到(dao)物體(ti)(ti)表面的距離成(cheng)正比，聲波(bo)傳(chuan)輸的距離S與聲速(su)C和(he)傳(chuan)輸時間(jian)T之(zhi)間(jian)的關系可以用公式(shi)表示：S= CⅩT/2