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水分測定儀選購指南-上海91福利在线观看分析儀器有限公司

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水分測定儀選購指南

更新時間:2011-05-09點擊次數:3811

一、選擇時考慮自動型儀器。
    手動的水分測定儀需要試驗者對玻璃滴定管中的試劑進行目測,在達到終點後也需要手動關閉,因各人動作習慣不同而遲延,會帶來不必要的誤差。

二、選擇時應考慮購買全密閉測試係統。
    裸露的卡爾-費休試劑因為碘的存在,非常容易吸收水分,待測乙酯樣品和甲醇溶劑也應盡量避免空氣中水分溶入而產生誤差的情況。

三、應考慮計量泵的壽命問題。
    計量泵是屬於容量法水分儀的關鍵部分,卡爾-費休試劑又是腐蝕性很高的試劑,應盡量選購由氟塑料等耐腐蝕的材料製成的計量泵,防止產生泄漏,導致儀器的報廢。

四、電極問題。
    該部分屬於儀器的核心部件,一方麵應具有較高的靈敏度,另一方麵,因其測試時浸泡在試驗池中,選擇配備的鉑電極儀器,以保持電極壽命。



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