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src="http://www.chem17.com/mystat.aspx?u=sanbon"></script>  <div id="ygw8qtu" class="ly_crumb"> <img src="/skins/170979/images/crumb_icon.png" /><p>當前位置：<a href="/">首頁(yè)</a> > <a href="/article.html">技術(shù)文章</a> > <span>電導率測定儀的工作原理是什么？</span></p> </div>   <div id="joc7cfn" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">電導率測定儀的工作原理是什么？</h1> <div id="ivb88kd" class="NyNewsdetail_tips">更新時(shí)間：2022-05-18 點(diǎn)擊次數：2276</div> <div id="biql438" class="NyNewsdetail_con"> 電導率儀是實(shí)驗室電導率測量?jì)x表，它除能測定一般液體的電導率外，且能滿(mǎn)足測量高純水的電導率的需要。儀器有0~10mV訊號輸出，可接自動(dòng)電子電位差計進(jìn)行連續記錄。測量原理：在電解質(zhì)的溶液中，帶電的離子在電場(chǎng)的影響下，產(chǎn)生移動(dòng)而傳遞電子，因此，具有導電作用。其導電能力的強弱稱(chēng)為電導度S。因為電導是電阻的倒數，因此，測量電導大小的方法，可用兩個(gè)電極插入溶液中，以測出兩個(gè)極間的電阻R。據歐姆定律，溫度一定時(shí)，這個(gè)電阻與電極的間距L(cm)成正比，與電極的截面積A(cm)反比。即：<div>　　(1)對于一個(gè)電極而言，電極面積A與間距L都是固定不變的，故是個(gè)常數，稱(chēng)電極常數，以Q表示，故(1)式可寫(xiě)成：</div><div>　　(2)式中：稱(chēng)電導率，以K表示，由(1)式知其單位是。因此，(2)式變?yōu)椤?/div><div>　　(3)在工程上因這個(gè)單位太大而采用其或作為單位，稱(chēng)，或。</div><div>　　(4)式中：Rx——液體電阻Rm——分壓電阻。</div><div>　　由(4)式可見(jiàn)，當E，Rm及Q均為常數時(shí)，K的變化必將引起Em作相應的變化。所以，通過(guò)測量Em的大小，也就測量得液體電導率的高低。儀器的電訊元件全部安裝在面板上，電路元件集中的安裝在一塊印刷板上，印刷板被固定在面板之反面。K：高周，低周開(kāi)關(guān);：電極常數調節器;：校正，測量開(kāi)關(guān);：校正調節器;：量程選擇開(kāi)關(guān);：電容補償調節器。Kx:：電極插口;：10mV輸出插口。K：電源開(kāi)關(guān);XE：氖燈。</div> </div> <div id="xl8qf4f" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-3015495.html">電磁流量計權函數求解測量系統的設計</a></li> <li>下一篇：<a 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