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)遇到電導率下降，往往導致電磁流量計無(wú)法正常運轉工作，那我們該如何解決呢?流體電導率的降低，將增加電極的輸出阻抗，并且由轉換器輸入阻抗引起的負載效而產(chǎn)生誤差，因此，按如下所述原則，規定了流量計應用中流體的電導率的下限。電極的輸出阻抗決定了轉換器所需的輸入阻抗的大小，而電極輸出阻抗，可認為流體的電導率和電極大小所支配。在理論分析時(shí)，將電極作為點(diǎn)電極，大小可以忽略，實(shí)際上，電極有一定大小，當直徑為d的圓板電極與電導率為K的半無(wú)限展寬的流體接觸時(shí)，其展寬電阻為1/2Kd，因此，如果管道直徑D>>d，則電極的輸出阻抗為兩個(gè)展寬電阻之和，即等于1/Kd。一般測量的流體電導率的下限為5μS/㎝～10μS/㎝，所以，若電極直徑為1㎝，則電極的輸出阻抗就為1/Kd=100kΩ～200kΩ，為使輸出阻抗的影響限制在0.1%以下，轉換器的輸入阻抗應為200MΩ左右。<br /> </div><div>　　本公司以質(zhì)量求生存，以信譽(yù)求發(fā)展，多年來(lái)培育出團結、進(jìn)取、務(wù)實(shí)、守信的科學(xué)精神，正是這種企業(yè)文化的巨大潛力推動(dòng)企業(yè)在新世紀里更加奮力向前。上海三本愿與業(yè)界同仁及廣大客戶(hù)真誠合作，促進(jìn)雙方事業(yè)的發(fā)展。</div> </div> <div id="4u9mofk" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-3076615.html">這樣的在線(xiàn)氯離子檢測儀真的是好用極了</a></li> <li>下一篇：<a href="/Article-3070319.html">淺析實(shí)驗室濁度儀的設計原理</a></li> </ul> </div> </div>   <div id="exdkmy3" class="ly_foot"> <div id="kjws4rj" class="ly_Ftmain"> <div id="mlsjv3t" class="ly_FtLeft"> <div id="nv38e3x" class="Ft_nav"><a href="/">首頁(yè)</a><a 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