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src="http://www.chem17.com/mystat.aspx?u=sanbon"></script>  <div id="awyecbe" class="ly_crumb"> <img src="/skins/170979/images/crumb_icon.png" /><p>當前位置：<a href="/">首頁</a> > <a href="/article.html">技術文章</a> > <span>談談大氣壓對工業溶氧儀測量結果的影響</span></p> </div>   <div id="rhjpnxd" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">談談大氣壓對工業溶氧儀測量結果的影響</h1> <div id="orxktwz" class="NyNewsdetail_tips">更新時間：2022-01-17 點擊次數：1031</div> <div id="fqhmgbe" class="NyNewsdetail_con"> <div>　　<a href="http://www.ztgbb.cn/SonList-1081641.html" target="_blank">工業溶氧儀</a>雖然在測量水中含氧量的領域算是比較可靠的，但是這并不排除其發生測量不穩定的故障。那么一般工業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系的。氧分壓跟該地區的海拔高度有著緊密的聯系。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行補償。<br /> </div><div>　　有些溶氧儀內部配有氣壓表，在標定時能夠自動進行校正;但是有些溶氧儀沒有配置氣壓表，所以在標定時需按照當地氣象站提供的數據進行設置。若是數據有誤，那么將會導致儀表產生較大的測量誤差。<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生變化，直接影響到溶氧電極的電流輸出。一般常常會采用熱敏電阻來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候使用的溶液含鹽量低，那么實際測量的溶液含鹽量就高，如此也會導致測量誤差。所以溶氧儀在實際使用中，必須要對測量介質的含鹽量進行分析，確保準確測量跟正確補償。<br /> </div><div>　　4、樣品的流速：<br /> </div><div>　　氧通過膜擴散跟通過樣品進行擴散要慢很多，所以必須確保電極膜與溶液*接觸。對于流通式的檢測方式，溶液中的氧會向流通池內擴散，讓靠近膜的溶液中的氧損失，產生擴散干擾現象，從而影響測量。因此為了確保測量準確，應當增加流過膜的溶液的流量來補償擴散失去的氧。</div> </div> <div id="yxzjwku" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-2910682.html">如何判斷溶氧儀質量的優劣？</a></li> <li>下一篇：<a href="/Article-2903346.html">溶氧儀使用的膜電極有兩種類型</a></li> </ul> </div> </div>   <div id="friklku" class="ly_foot"> <div id="qpyauto" class="ly_Ftmain"> <div id="fgtgadn" class="ly_FtLeft"> <div id="julnazn" 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