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class="NyNewsdetail_tips">更新時(shí)間：2023-06-14 點(diǎn)擊次數：1541</div> <div id="jsovcj8" class="NyNewsdetail_con"> <div>　　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(fā)出，聲波經(jīng)液體表面反射后被同一傳感器接收或超聲波接收器，通過(guò)壓電晶體或磁致伸縮器件轉換成電信號，并由聲波的發(fā)射和接收之間的時(shí)間來(lái)計算傳感器到被測液體表面的距離。由于采用非接觸的測量，被測介質(zhì)幾乎不受限制，可廣泛用于各種液體和固體物料高度的測量。</div><div>　　超聲波液位計可采用二線(xiàn)制、三線(xiàn)制或四線(xiàn)制技術(shù)，二線(xiàn)制為：供電與信號輸出共用；三線(xiàn)制為：供電回路和信號輸出回路獨立，當采用直流24v供電時(shí)，可使用一根3芯電纜線(xiàn)，供電負端和信號輸出負端共用一根芯線(xiàn)；四線(xiàn)制為：當采用交流220v供電時(shí)，或者當采用直流24v供電，要求供電回路與信號輸出回路隔離時(shí)，應使用一根4芯電纜線(xiàn)。直流或交流供電，具有4~20mADC，高低位開(kāi)關(guān)量輸出。量程范圍：0-50米，多種形式可選，適合各種腐蝕性、化工類(lèi)場(chǎng)合，精度高，遠傳信號輸出，PLC系統監控。工作原理：</div><div>　　超聲波液位計工作原理如圖所示,超聲波液位計一般采用收發(fā)合一的陶瓷超聲波換能器,聲波的發(fā)射和接收都由同一個(gè)探頭完成。探頭向被測液面發(fā)射超聲波信號,超聲波由探頭經(jīng)傳播介質(zhì)傳播至被測液面,在液面上形成反射,反射波沿原路徑傳播至探頭,被探頭接收。</div> </div> <div id="i8w3vh9" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-3386448.html">一體防爆電導率儀可以分為單通道和多通道兩種類(lèi)型</a></li> <li>下一篇：<a 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