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<img src="/skins/257424/images/home.png"> <p>當(dāng)前位置：<a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > <span>實驗室PH計的原理、校準(zhǔn)及維護</span></p> </div>   <div id="sq82xwe7wu" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">實驗室PH計的原理、校準(zhǔn)及維護</h1> <div id="sq82xwe7wu" class="NyNewsdetail_tips">更新時間：2020-08-17 點擊次數(shù)：5205</div> <div id="sq82xwe7wu" class="NyNewsdetail_con" id="c_detail_wrap"> <p><span style="font-size:9.5pt"><span style="color:#404041"><span style="font-family:宋體"> 目前測量溶液PH值所使用的指標(biāo)電極多為玻璃膜電極，參比電極有甘汞電極、銀-氯化銀電極、固體參比電極等。本廠目前所有的電極是符合玻璃膜電極。其使用和維護都比較方便。具體種類如下：</span></span></span></p><p><span style="font-size:9.5pt"><span style="color:#404041"><span style="font-family:宋體">1、PH電極校準(zhǔn)</span></span></span><br /><span style="font-size:9.5pt"><span style="color:#404041"><span style="font-family:宋體">PH電極的校準(zhǔn)分為兩種，一種為緩沖液校準(zhǔn)，另一種為溫度校準(zhǔn)。</span></span></span><br /><span style="font-size:9.5pt"><span style="color:#404041"><span style="font-family:宋體"> 因為PH電極的測量是將溶液中氫離子的活度轉(zhuǎn)變?yōu)橐环N電壓值，并經(jīng)過計算得出PH值，緩沖液校準(zhǔn)的目的就是通過電極來測量已知濃度的緩沖液，從而得到電壓值，并建立一條電壓和PH值關(guān)系的曲線存儲儀器內(nèi)部作為測量的依據(jù)，常用的緩沖液有4.003、6.86、9.182三種。在調(diào)試儀表過程中，用4.003和9.182兩種標(biāo)準(zhǔn)液進行校準(zhǔn)，測量6.86的緩沖液看是否準(zhǔn)確。現(xiàn)場實際應(yīng)用時，要根據(jù)實際測量樣水和PH值來確定用哪一種或兩種來校準(zhǔn)儀器。如果被測水為酸性，即PH小于7，則用4.003和6.86兩種緩沖液進行校準(zhǔn)；如果被測水樣呈堿性，即PH值大于7，則用6.86和9.18兩種緩沖液進行校準(zhǔn)。也就是說，校準(zhǔn)液的PH值與PH值與測量水樣的PH值越接近越好。</span></span></span><br /><span style="font-size:9.5pt"><span style="color:#404041"><span style="font-family:宋體"> 對于PH測量過程中，影響大的因素就是溫度，不同溫度下，即使是容一個水樣也會有不同的PH值。因此各種PH值均設(shè)有溫度補償電路來消除這一影響。本廠儀器用來測量溫度的溫度電極均有鉑電阻制成。鉑電阻在不同溫度下會有不同的電阻值，因而準(zhǔn)確測量出溫度電極的電阻值就可以計算出水樣的溫度。校準(zhǔn)時電阻箱輸入一特定電阻，并輸入相應(yīng)的溫度值。儀表會建立溫度與電阻間的函數(shù)關(guān)系，當(dāng)測量時，由溫度電極傳過來的電阻值經(jīng)計算即可得到溫度值。</span></span></span><br /> <br /><span style="font-size:9.5pt"><span style="color:#404041"><span style="font-family:宋體">2、電極的維護</span></span></span><br /><span style="font-size:9.5pt"><span style="color:#404041"><span style="font-family:宋體">電極的維護分兩種，一種是初次使用或長時間不用后再次使用的維護；另一種是日常維護。</span></span></span><br /><span style="font-size:9.5pt"><span style="color:#404041"><span style="font-family:宋體"> 初次使用的電極或長期停放后再使用的電極，尤其是測量電極，由于電極表面的敏感膜長期處于干燥狀態(tài)，不能很好的導(dǎo)通離子，且因長期停放肯能造成電極表面臟、填充液泄露等現(xiàn)象。在開始使用前應(yīng)先檢查電極填充液，如果也面低可適當(dāng)添加，如果電極存放時間非常長也可以考慮換掉。然后要用干凈的酒精棉球?qū)㈦姌O頭部擦拭干凈，再將電極置于其參比填充液中浸泡24小時，使用電極表面形成凝膠層方可正常使用。</span></span></span><br /><span style="font-size:9.5pt"><span style="color:#404041"><span style="font-family:宋體"> 電極在日常使用過程中要輕拿輕放，盡可能不要和測量被發(fā)生碰撞或摩擦。不要用手觸摸電極的頭部（防止弄臟電極），不要用濾紙等擦拭電極頭部（以免產(chǎn)生靜電影響測量）。測量時應(yīng)先用待測水樣將電極清洗兩次再進行測量。測量結(jié)束后將電極浸于其參比液中，不建議浸于純水中，以免影響電極壽命。</span></span></span></p><p style="margin-right:0.0000pt"><span style="font-size:9.5pt"><span style="color:#404041"><span style="font-family:宋體">經(jīng)常使用PH計的朋友們，這些基本常識你都了解了嗎？</span></span></span></p> </div> <div id="sq82xwe7wu" class="ly_PrevNext"> <ul> <li>上一篇：<a 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