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class="NyNewsdetail_title">哪些因素導致ST-500電磁流量計在使用中會(huì )產(chǎn)生誤差？</h1> <div id="g3iyu9e" class="NyNewsdetail_tips">更新時(shí)間：2021-09-23 點(diǎn)擊次數：1615</div> <div id="tqb4q8y" class="NyNewsdetail_con"> <div>　　ST-500電磁流量計是應用電磁感應原理，根據導電流體通過(guò)外加磁場(chǎng)時(shí)感生的電動(dòng)勢來(lái)測量導電流體流量的一種儀器。但是ST-500電磁流量計在使用的時(shí)候會(huì )出現測量誤差的情況，這是怎么回事?什么原因造成的呢?接下來(lái)小編為大家來(lái)具體說(shuō)明一下。<br /> </div><div>　　1、管內液體沒(méi)有充滿(mǎn)。由于背壓不足或流量傳感器安裝位置不良，致使測試管內液體未能充滿(mǎn)。當管內存在很少量氣體時(shí)，則會(huì )使測量結果偏離實(shí)際值，造成小誤差;當有很多氣體存在時(shí)，則會(huì )出現測量值不穩定，輸出晃動(dòng)，此時(shí)測量值誤差較大，不能作為正確結果。<br /> </div><div>　　2、被測液體中含有固體成分。當出現這種情況時(shí)，儀表通常會(huì )出現以下問(wèn)題：液漿噪聲，電機表面沾染污垢，襯里被磨損或被沉積物覆蓋，流通截面積縮小，導電沉積層或絕緣沉積腹桿電極或襯里，若沉積層有導電物質(zhì)，流量信號很有可能被短路，使儀表出現故障。<br /> </div><div>　　3、電極和接地環(huán)材質(zhì)選擇不當。因材質(zhì)與被測介質(zhì)不匹配而引發(fā)故障的電磁流量計與介質(zhì)接觸的零部件有電極與接地環(huán)，匹配失當除耐腐蝕問(wèn)題外，主要是電極表面效應。電極能否可靠地檢測流量信號，對流量計的性能至關(guān)重要。接地環(huán)起到與介質(zhì)形成電的連接，通過(guò)接地線(xiàn)和零電位接通。當與傳感器連接的工藝管道為塑料或內有絕緣涂層的管道時(shí)，必須安裝接地環(huán)，否則會(huì )造成儀表不能正常工作。<br /> </div><div>　　4、電導率不均勻<br /> </div><div>　　配比流程中常有在液內注入“加藥”液，而注入液常用往復泵加入。若注入液與主液電導率不同，而混合液尚未混合均勻，電磁流量計傳感器若裝其下游，因電導率急劇變化會(huì )使儀表輸出晃動(dòng)，雖然液體電導率大于閥值而緩慢變化是不會(huì )影響電磁流量計正常測量。這一現象在給水處理工程原水加凝聚劑工藝中是經(jīng)常發(fā)生的。</div> </div> <div id="bo3cw3x" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-2804630.html">電磁流量計與管路相互連接的四種方法你都會(huì )嗎？</a></li> <li>下一篇：<a href="/Article-2778983.html">氧化鋯分析儀的日常維護注意事項說(shuō)明</a></li> </ul> </div> </div>   <div id="8deqq98" class="ly_foot"> <div id="wpqb884" class="ly_Ftmain"> <div id="o3ctklm" class="ly_FtLeft"> <div id="pr8888x" class="Ft_nav"><a href="/">首頁(yè)</a><a href="/aboutus.html" target="_blank">關(guān)于我們</a><a href="/products.html" 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