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id="8yulcoq" class="NyNewsdetail_tips">更新時(shí)間：2017-07-20 點(diǎn)擊次數：2170</div> <div id="bf8m9i8" class="NyNewsdetail_con"> 　　<strong><a target="_blank">電磁流量計</a></strong>是測量封閉管道中的導電液體和漿液中的體積流量，包括酸、堿、鹽等強腐蝕性的液體。電磁流量計在鋼鐵行業(yè)冷卻水測量中出現的誤報警大多是由氣泡擦過(guò)電極，形成短暫時(shí)間的感應信號為零，這是一種氣穴現象。那么，氣泡噪聲問(wèn)題如何避免呢？<p align="center"><img src="http://img67.chem17.com/9/20170720/636361626243164619332.png" alt="電磁流量計" width="140" height="158" align="middle" /></p><div>　　1、應從安裝上滿(mǎn)足電磁流量計上游直管段長(cháng)度要求,規范儀表的安裝,選擇遠離熱源的安裝場(chǎng)所,合理使用管道流速,選用光潔度高的PFA氟塑料襯里和高純氧化鋁工業(yè)陶瓷導管。這些措施將有助于防止或減小旋渦和氣體分離的發(fā)生。也就是說(shuō),改進(jìn)傳感器制造工藝、改善使用儀表環(huán)境條件和安裝條件、采用儀表上游加裝排氣閥等措施,有可能避免問(wèn)題的發(fā)生。</div><div>　　2、合理地設置流量計阻尼時(shí)間和功能,也可以解決出現氣泡噪聲測量的誤報警。阻尼時(shí)間的選擇是根據流量信號中發(fā)生氣泡噪聲的脈沖寬度來(lái)選取。一般應取阻尼時(shí)間為氣泡噪聲脈沖寬度的3~5倍。如氣泡噪聲脈沖寬度是10s,阻尼時(shí)間應取30~50s。具體選擇應根據要求的控制精度,3倍脈沖寬度控制誤差在5%,5倍脈沖寬度控制精度高于1%。</div><div>　　加大儀表阻尼時(shí)間能有效地解決這種脈沖型氣泡噪聲的影響,同時(shí)也帶來(lái)了反應遲鈍的缺點(diǎn),即當真正流量波動(dòng)時(shí),儀表反應很慢。這對要求靈敏控制的冷卻水系統無(wú)疑是個(gè)難題。為了解決這個(gè)問(wèn)題,智能電磁流量計可以使用軟件邏輯判斷即粗大誤差處理的方法。在出現這種故障時(shí),通過(guò)調整流量的不敏感時(shí)間和變化幅度限制這兩個(gè)條件來(lái)判斷是流量的變動(dòng),還是氣泡擦過(guò)電極。如果不是氣泡擦過(guò)電極的噪聲,CPU按正常采樣、運算和數字濾波;如果判定產(chǎn)生的是氣泡噪聲,切除測量值,維持前面的流量測量值。這樣,正常流量測量期間阻尼時(shí)間仍然為3~6s。只有在有氣泡噪聲時(shí),根據脈沖寬度設置的長(cháng)短將不敏感時(shí)間加長(cháng),系統控制的時(shí)間也會(huì )加長(cháng)。</div> </div> <div id="9zlxt9p" class="ly_PrevNext"> <ul> <li>上一篇：<a 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