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<p>在線COD分析儀</p><p>水中的氧含量可充分顯示水自凈的程度。對于使用活化污泥的生物處理廠來說，了解曝氣池和氧化溝的氧含量非常重要，污水中溶氧增加，會促進除厭氧微生物以外的生物活動，因而能去除揮發性物質和易于自然氧化的離子，使污水得到凈化。測定氧含量主要有三種方法：自動比色分析和化學分析測量，順磁法測量，電化學法測量。水中溶氧量一般采用電化學法測量。</p><p>其中的電極由陰極（常用金和鉑制成）和帶電流的反電極（銀）、無電流的參比電極（銀）組成，電極浸沒在電解質如KCl、KOH中，傳感器有隔膜覆蓋，隔膜將電極和電解質與被測量的液體分開，因此保護了傳感器，既能防止電解質逸出，又可防止外來物質的侵入而導致污染和毒化。向反電極和陰極之間施加*化電壓，假如測量元件浸入在有溶解氧的水中，氧會通過隔膜擴散，出現在陰極上（電子過剩）的氧分子就會被還原成氫氧根離子： O2 2H2O 4e-? 4OH-。電化學當量的氯化銀沉淀在反電極上（電子不足）：4Ag 4Cl-? 4AgCl 4e-。對于每個氧分子，陰極放出4個電子，反電極接受電子，形成電流，污水的氧分壓成正比，該信號連同傳感器上熱電阻測出的溫度信號被送入變送器，利用傳感器中存儲的含氧量和氧分壓、溫度之間的關系曲線計算出水中的含氧量，然后轉化成標準信號輸出。參比電極的功能是確定陰極電位。 COS 4溶氧傳感器的響應時間為：3分鐘后達到終測量值的90%，9分鐘后達到終測量值的99%；低流速要求為0.5cm/s 。</p><p><img src="http://l.b2b168.com/2020/11/04/14/202011041404105639304.jpg"></p><br /><a href="http://www.1152763.com/">http://www.1152763.com</a> </div> </div> </div> <div class="zxzsI" container="2"> <a class="biaoti animated rotateInDownRight"><font>產品推薦</font><p>Development, design, production and sales in one of the manufacturing enterprises</p></a> 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