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)增大測量誤差;通常要求液體電導率不小于5μS/cm，去離子水電導率不小于20μS/cm。<br /> </div><div>　　2.被測介質(zhì)溫度<br /> </div><div>　　流量計一般只能用于工藝介質(zhì)溫度不高于180℃的場(chǎng)合。選型時(shí)，要根據被測工藝介質(zhì)的溫度范圍，選擇測量管內襯材料及傳感器線(xiàn)圈的漆包線(xiàn)的耐溫等級。常用測量管襯里材料有聚四氟乙烯(PTFE)，適用溫度范圍-40~+180℃;氯丁橡膠(Neoprene)，適用溫度<65℃;聚氨酯橡膠(Polyurethane),適用溫度<65℃;<br /> </div><div>　　3.當被測液體為酸、堿、鹽等高腐蝕性介質(zhì)時(shí)<br /> </div><div>　　因為流量計僅測量管襯里和電極與被測介質(zhì)接觸，所以只要選好這兩者的材質(zhì)即可。耐酸、堿等強腐蝕性介質(zhì)的襯里常選用聚四氟乙烯(PTFE)，耐磨損類(lèi)如礦漿、結晶類(lèi)介質(zhì)的襯里可選用聚氨酯橡膠(Polyurethane)。對于電極材質(zhì)的選，擇，一般可查有關(guān)防腐蝕手冊[2]，對于混酸等成份復雜的介質(zhì)，應做掛片試驗。<br /> </div><p align="center"><img src="https://img68.chem17.com/9/20220516/637883181559920995719.jpg" alt="電磁流量計" width="233" height="239" align="middle" /></p><p> </p><div>　　4.當被測液體為臟污流(兩相，漿液等)介質(zhì)時(shí)<br /> </div><div>　　(1)當介質(zhì)含有固體顆粒時(shí)，水平安裝易使下半部?jì)纫r及電極磨損嚴重，這時(shí)選用垂直安裝較好;襯里要選用高耐磨性材料，如陶瓷或聚氨酯橡膠;電極則采取--些結構措施以防磨損漏液。<br /> </div><div>　　(2)測量會(huì )在管壁附著(zhù)和沉淀的物質(zhì)的流體時(shí)，應注意電極的污染?？蛇x用刮刀式、可更換式。管壁的附著(zhù)則可用提高流速以起到自清洗作用，或采取比較方便易清洗管道的連接方法。<br /> </div><div>　　(3)含有非磁性顆?；蚶w維的固液兩相流時(shí)，如漿液擦過(guò)電極表面會(huì )產(chǎn)生尖峰噪聲，使信號不穩，可選用市電交流激磁或雙頻激磁儀表。<br /> </div><div>　　5.工藝介質(zhì)的流速<br /> </div><div>　　儀表口徑是根據管道內平均流速而定的，通常選用與管道相同的口徑或略小些。一般工業(yè)輸水管道經(jīng)濟流速為1.5~3m/s,易粘附沉積結垢物質(zhì)則提高到3~4m/'s或更高，礦漿等磨蝕性強的為2~3m/s。流量計的液體流速范圍可在1~10m/s之間選用。原理上，上限流速并沒(méi)有限制，滿(mǎn)度流量的流速下限一般為1m/s,有些產(chǎn)品為0.5m/s,低于此流速，從測量準確度出發(fā)應改用小管徑，以異徑管連接到管道。但加裝異徑管要注意壓力損失的問(wèn)題。圖1為流量計口徑、流速與流量關(guān)系的曲線(xiàn)圖，計算儀表口徑時(shí)可參照。<br /> </div><div>　　6.大口徑時(shí)電磁流量計的選擇<br /> </div><div>　　流量計按安裝形式可分為管道式和探頭式。一般優(yōu)先選用管道式流量計;當工藝管徑較大且考慮設備費用時(shí),或安裝時(shí)不允許管道停流的情況下，可選用探頭式流量計(精度可達0.5級)。<br /> </div><div>　　(1)探頭式可裝配球閥，可在管道不停流情況下拆、裝，利于儀表的在線(xiàn)安裝和維護。<br /> </div><div>　　(2)探頭插入深度只需很短，對管道阻力小。--般在直管段足夠長(cháng)時(shí)，采用平均流速點(diǎn)測量法，這種方法的測量精度基.本不受雷諾系數變化的影響，探頭的插人深度僅為R=0.121D;當直管段較短時(shí)，一般采用中心流速點(diǎn)測量法，插入深度R=0.5D(其中D為管道直徑)。<br /> </div><div>　　7.工藝管道材質(zhì)<br /> </div><div>　　若連接儀表的管道是(相對于被測介質(zhì))金屬導電性的，不需要接電環(huán)，若是絕緣性的，則要用接地環(huán)，可用普通型，它的材質(zhì)應與被測介質(zhì)的腐蝕性相適應。若被測介質(zhì)是磨損性的，則宜選用帶頸接地環(huán)，以保護進(jìn)、出口端的襯里，延長(cháng)使用壽命。<br /> </div><div>　　8.安裝儀表的工藝管道段的敷設位置<br /> </div><div>　　電磁流量計的安裝形式可分為三種:一體型、分離型和潛水分離型(IP68)。一般情況選用一體型，它將流量計的傳感部分和轉換部分(表頭)裝于一體，便于安裝使用;當管道敷設的位置較高不便觀(guān)察或安裝在環(huán)境差的場(chǎng)合，可采用分離型，分離長(cháng)度一般不超過(guò)30m;當傳感器需要安裝在井下、水下的被測現場(chǎng)管道上時(shí)，需要選用潛水分離型。</div> </div> <div id="vd77zz7" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-3013693.html">談?wù)勓趸喎治鰞x探頭的種類(lèi)</a></li> <li>下一篇：<a href="/Article-3008086.html">如何解決工業(yè)PH計零點(diǎn)漂移的問(wèn)題？</a></li> </ul> </div> </div>   <div id="xrf77xf" class="ly_foot"> <div id="nfbfbnj" class="ly_Ftmain"> <div id="pzvrnzt" class="ly_FtLeft"> <div id="jj7hdzn" 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" target="_blank">產(chǎn)品展示</a><a href="/news.html" target="_blank">新聞中心</a><a 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