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        1. 上海乾思生物科技有限公司
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          工業(yè)在線pH計(jì)為什么要定期校準(zhǔn)

          時(shí)間:2011/10/20閱讀:1446
          分享:
          工業(yè)在線pH計(jì)的精度和壽命取決于工業(yè)在線pH計(jì)電極,價(jià)格差異也很大,但很多時(shí)候是使用方法不當(dāng),致使測(cè)量不準(zhǔn)。工業(yè)在線pH計(jì)使用過(guò)一段時(shí)間后都要重新調(diào)校,時(shí)間取決于所測(cè)溶液和使用頻率。使用一段時(shí)間后,工業(yè)在線pH計(jì)電極不對(duì)稱,電位將會(huì)發(fā)生很大改變,故須定期校準(zhǔn)。工業(yè)在線pH計(jì)標(biāo)定校準(zhǔn)的次數(shù)取決于試樣、工業(yè)在線pH計(jì)ph電極性能及對(duì)測(cè)量的度要求。高精度測(cè)量(≤±0103pH),應(yīng)及時(shí)校準(zhǔn);一般精度測(cè)量(≤±011pH),經(jīng)過(guò)一次校準(zhǔn)后可連續(xù)使用兩周甚至更長(zhǎng)時(shí)間。只要測(cè)量顯示pH值是準(zhǔn)確的,就沒(méi)必要頻繁對(duì)ph電極進(jìn)行標(biāo)定。先測(cè)試與被測(cè)溶液較接近的標(biāo)準(zhǔn)溶液,根據(jù)誤差大小,確定是否需要重新校準(zhǔn)。在下列情況下必須重新校準(zhǔn):①更換新的工業(yè)在線pH計(jì)電極。②工業(yè)在線pH計(jì)測(cè)量濃酸液(pH<2)以后,或測(cè)量濃堿液(pH>12)以后。③工業(yè)在線pH計(jì)測(cè)量含有氟化物的溶液或較濃的有機(jī)溶液后。④被測(cè)溶液溫度與標(biāo)準(zhǔn)溶液溫度(或室溫)相差過(guò)大時(shí)。

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