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id="hlnmtvc" class="NyNewsdetail_tips">更新時(shí)間：2022-01-17 點(diǎn)擊次數：1107</div> <div id="3fhj3fw" class="NyNewsdetail_con"> <div>　　<a href="http://www.tianhualian.com.cn/SonList-1081641.html" target="_blank">工業(yè)溶氧儀</a>雖然在測量水中含氧量的領(lǐng)域算是比較可靠的，但是這并不排除其發(fā)生測量不穩定的故障。那么一般工業(yè)溶氧儀測量數值不穩定的原因都有哪些呢?<br /> </div><div>　　1、大氣壓對溶氧儀測量結果的影響：<br /> </div><div>　　根據Henry 定律，氣體的溶解度與它的分壓是成正比關(guān)系的。氧分壓跟該地區的海拔高度有著(zhù)緊密的聯(lián)系。高原地區和平原地區的差壓可達20%。所以使用溶氧儀前必須按照當地的大氣壓進(jìn)行補償。<br /> </div><div>　　有些溶氧儀內部配有氣壓表，在標定時(shí)能夠自動(dòng)進(jìn)行校正;但是有些溶氧儀沒(méi)有配置氣壓表，所以在標定時(shí)需按照當地氣象站提供的數據進(jìn)行設置。若是數據有誤，那么將會(huì )導致儀表產(chǎn)生較大的測量誤差。<br /> </div><div>　　2、溫度對溶氧儀測量結果的影響：<br /> </div><div>　　由于溫度變化，膜的擴散系數和氧的溶解度都將發(fā)生變化，直接影響到溶氧電極的電流輸出。一般常常會(huì )采用熱敏電阻來(lái)消除溫度對儀表的測量影響。溫度上升，擴散系數增加，溶解度反而減小。<br /> </div><p align="center"><img src="https://img74.chem17.com/9/20220117/637780347937543525262.jpg" alt="工業(yè)溶氧儀" width="500" height="426" align="middle" /></p><p> </p><div>　　3、溶液中含鹽量：<br /> </div><div>　　由于鹽水中的溶解氧明顯要比自來(lái)水中的溶解氧低，所以為了準確測量，需要考慮含鹽量對溶解氧的影響。在溫度不變的情況下，鹽含量每增加100mg/L，溶解氧降低約1%。<br /> </div><div>　　若是儀表在標定的時(shí)候使用的溶液含鹽量低，那么實(shí)際測量的溶液含鹽量就高，如此也會(huì )導致測量誤差。所以溶氧儀在實(shí)際使用中，必須要對測量介質(zhì)的含鹽量進(jìn)行分析，確保準確測量跟正確補償。<br /> </div><div>　　4、樣品的流速：<br /> </div><div>　　氧通過(guò)膜擴散跟通過(guò)樣品進(jìn)行擴散要慢很多，所以必須確保電極膜與溶液*接觸。對于流通式的檢測方式，溶液中的氧會(huì )向流通池內擴散，讓靠近膜的溶液中的氧損失，產(chǎn)生擴散干擾現象，從而影響測量。因此為了確保測量準確，應當增加流過(guò)膜的溶液的流量來(lái)補償擴散失去的氧。</div> </div> <div id="38ofcub" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-2910682.html">如何判斷溶氧儀質(zhì)量的優(yōu)劣？</a></li> <li>下一篇：<a href="/Article-2903346.html">溶氧儀使用的膜電極有兩種類(lèi)型</a></li> </ul> </div> </div>   <div id="w8vneln" class="ly_foot"> <div id="gugspgd" class="ly_Ftmain"> <div id="aoqc8eq" class="ly_FtLeft"> <div id="aolc8el" 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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