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class="news_detail"> <h1>這些會(huì)影響便攜式明渠流量計(jì)準(zhǔn)確度的因素您知道嗎？</h1> <div id="iu7u9n1ckzs0" class="nwdtl_tip"><span>更新時(shí)間：2022-11-25</span><span>瀏覽：458次</span></div> <div id="iu7u9n1ckzs0" class="nwdtl_con"> <div> 　　<a href="http:///SonList-2365693.html" target="_blank">便攜式明渠流量計(jì)</a>是一種非接觸式儀表，它既可以測(cè)量大管徑的介質(zhì)流量也可以用于不易接觸和觀察的介質(zhì)的測(cè)量。它的測(cè)量準(zhǔn)確度很高，外夾式安裝可以達(dá)到±0.5%的精度，幾乎不受被測(cè)介質(zhì)的各種參數(shù)的干擾，尤其可以解決其它儀表不能的強(qiáng)腐蝕性、非導(dǎo)電性、放射性及易燃易爆介質(zhì)的流量測(cè)量問題。</div><div> </div><div>　　那么有哪些因素會(huì)影響便攜式明渠流量計(jì)測(cè)量的準(zhǔn)確度呢？</div><div> </div><div>　　1、安裝條件和使用環(huán)境</div><div> </div><div>　　它對(duì)流場(chǎng)有一定的要求，管道內(nèi)液體必須為滿管。安裝時(shí)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(kuò)管、漸縮管等阻流件時(shí)，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(duì)流場(chǎng)的影響，認(rèn)為閥門*打開時(shí)管道內(nèi)為通徑對(duì)流場(chǎng)無影響。其實(shí)不然，無論是蝶閥還是球閥、閘閥，當(dāng)其*打開時(shí)，其內(nèi)部仍然有阻流件影響流場(chǎng)，流場(chǎng)不穩(wěn)定就造成了測(cè)量準(zhǔn)確度的降低。使用時(shí)應(yīng)避開強(qiáng)電磁和聲波信號(hào)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(huì)對(duì)其測(cè)量準(zhǔn)確度產(chǎn)生影響。</div><div> </div><div>　　2、管道參數(shù)測(cè)量不準(zhǔn)確</div><div> </div><div>　　利用聲波信號(hào)在同一傳播距離時(shí)，在順流、逆流兩個(gè)方向上有不同的傳播速度，用傳播速度之差與被測(cè)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(jì)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(cè)量準(zhǔn)確度。</div> </div> </div> <div id="iu7u9n1ckzs0" 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 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