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class="ny_newsdetail clear"> <h1 class="ny_newsdetail_title">PH酸度計的構(gòu)成部件及種類</h1> <div id="ytmnq1nx" class="ny_newsdetail_tips">更新時間：2014-11-06 | 點擊率：2901</div> <div id="ytmnq1nx" class="ny_newsdetail_con"> <span style="font-size: 12px;"> <strong><a href="http://wanyida.cn/">ph酸度計</a></strong>可以根據(jù)應(yīng)用的場合、精度需求、讀數(shù)指示和器件型號進(jìn)行分類： </span><div> 1、根據(jù)應(yīng)用場合分類：分為筆試ph計、便攜式ph計、臺式ph計和工業(yè)ph計等。筆試ph計主要用途是取代ph試紙，突出精度低、使用方便的特點。便攜式PH酸度計主要用在現(xiàn)場或者野外測試方面，具有高的精度和完善的功能。臺式ph計是一種高精度的分析儀表，要求高精度、功能全面，還要擁有報警和控制功能，以及安裝、清洗、抗干擾等等特點。 </div><div> 2、根據(jù)儀器精度分類：可分為0.2級、0.1級、0.02級、0.01級、0.001級，數(shù)字越低表示精度越高。 </div><div> 3、根據(jù)讀數(shù)指示分類：科分為指針式和數(shù)字顯示（數(shù)顯）兩種?，F(xiàn)在指針式PH酸度計很少使用了，但是指針式的儀表能夠顯示數(shù)據(jù)的連續(xù)變化過程，所以在滴定分析中還是很有用的。 </div><div> 4、根據(jù)器件類型分類：可分為晶體管式、集成電路式、單片機(jī)微電腦式，現(xiàn)在很多是應(yīng)用微電腦芯片，可以大大減少儀器體積和單片機(jī)成本，不過芯片的開發(fā)成本很貴。 </div><div> <strong>ph酸度計</strong>的構(gòu)成部件有哪些？ </div><div> <strong>ph酸度計</strong>zui主要的功能和zui精密的地方就是進(jìn)行典韋測量，那么ph計有哪幾個部件構(gòu)成： </div><div> 1、一個參比電極：維持一個恒定的電位，作為測量各種偏離電位的對照； </div><div> 2、一個玻璃電極：其電位取決于周圍溶液的ph； </div><div> 3、一個電流計：電流計可以在電阻極大地電路中測量出微小的電位差。 </div><div> <strong>PH酸度計</strong>的主要部件是精密的電位計。測定時把復(fù)合電極插在被測溶液中，由于被測溶液的酸度(H+濃度)不同而產(chǎn)生不同的電動勢，將它通過直流放大器放大，zui后由讀數(shù)指示器(電壓表)指出被測溶液的pH值。 </div><div><strong>PH酸度計</strong>的正確使用與維護(hù)方法 </div><div> 一、正確使用與保養(yǎng)電極 </div><div> 目前實驗室使用的電極都是復(fù)合電極，其優(yōu)點是使用方便，不受氧化性或還原性物質(zhì)的影響，且平衡速度較快。使用時，將電極加液口上所套的橡膠套和下端的橡皮套全取下，以保持電極內(nèi)氯化鉀溶液的液壓差。下面就把電極的使用與維護(hù)簡單作一介紹： </div><div> ⒈復(fù)合電極不用時，可充分浸泡3M氯化鉀溶液中。切忌用洗滌液或其他吸水性試劑浸洗。 </div><div> ⒉使用前，檢查玻璃電極前端的球泡。正常情況下，電極應(yīng)該透明而無裂紋；球泡內(nèi)要充滿溶液，不能有氣泡存在。 </div><div> ⒊測量濃度較大的溶液時，盡量縮短測量時間，用后仔細(xì)清洗，防止被測液粘附在電極上而污染電極。 </div><div> ⒋清洗電極后，不要用濾紙擦拭玻璃膜，而應(yīng)用濾紙吸干,避免損壞玻璃薄膜、防止交叉污染，影響測量精度。 </div><div> ⒌測量中注意電極的銀—氯化銀內(nèi)參比電極應(yīng)浸入到球泡內(nèi)氯化物緩沖溶液中，避免電計顯示部分出現(xiàn)數(shù)字亂跳現(xiàn)象。使用時，注意將電極輕輕甩幾下。 </div><div> ⒍電極不能用于強(qiáng)酸、強(qiáng)堿或其他腐蝕性溶液。 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