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</div><div>　　它對流場有一定的要求，管道內(nèi)液體必須為滿管。安裝時前、后直管段在一般情況下應(yīng)至少滿足10D后5D的要求。若上、下游側(cè)安裝有90°彎頭、T字形彎頭、漸擴管、漸縮管等阻流件時，應(yīng)將上、下游直管段延長到30D至50D。不少使用者忽視了閥門對流場的影響，認(rèn)為閥門*打開時管道內(nèi)為通徑對流場無影響。其實不然，無論是蝶閥還是球閥、閘閥，當(dāng)其*打開時，其內(nèi)部仍然有阻流件影響流場，流場不穩(wěn)定就造成了測量準(zhǔn)確度的降低。使用時應(yīng)避開強電磁和聲波信號的干擾。使用中我們發(fā)現(xiàn)在變頻器旁、高壓線下方、車輛密集的馬路旁，都會對其測量準(zhǔn)確度產(chǎn)生影響。</div><div> </div><div>　　2、管道參數(shù)測量不準(zhǔn)確</div><div> </div><div>　　利用聲波信號在同一傳播距離時，在順流、逆流兩個方向上有不同的傳播速度，用傳播速度之差與被測液體流速的關(guān)系求得流速。流量是流速與管道橫截面積的乘積。若要得到準(zhǔn)確的流量，就需要知道準(zhǔn)確的換能器傳播距離和管道橫截面積，而這些數(shù)據(jù)是通過使用者人工輸入管道外徑、材質(zhì)、壁厚、襯里及襯里厚度等參數(shù)，經(jīng)內(nèi)部計算得出的。因此，這些參數(shù)的準(zhǔn)確與否將直接影響到其測量準(zhǔn)確度。</div> </div> </div> <div id="lxnrdpj" class="prev_next"> <ul> <li><p>上一篇：<a href="/Article-3223489.html">青島國瑞力恒大流量環(huán)境空氣綜合采樣器</a></p></li> <li><p>下一篇：<a href="/Article-3198470.html">恒溫加熱箱樣品加熱保存箱的產(chǎn)品介紹</a></p></li> </ul> </div> </div>    <div class="hlndvpl" id="z_Footer"> <div id="p5tl553" class="pz_down"> <div 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