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手持式溶氧儀的標定方法

发表时间：2018-12-14 12:00

手持式溶氧儀的標定方法：手持溶氧仪一般可采用标准液标定或现场取样标定。

(1)手持式溶氧儀標准溶液標定法：

標准溶液標定一般采用兩點標定，超聲波測厚儀即零點標定和量程標定。零點標定溶液可采用2%的Na2SO3溶液。量程標定溶液可根據儀表測量量程選擇4M的KCl溶液(2mg/L);濕度傳感器探頭,不鏽鋼電熱管,PT100傳感器,流體電磁閥,鑄鋁加熱器,加熱圈50%的甲醇溶液(21.9mg/L)。

(2)手持式溶氧儀現場取樣標定法：

在手持式溶氧儀實際使用中，多采用Winkler方法對溶解氧分析儀進行現場標定。使用該方法時存在兩種情況：取樣時儀表讀數爲M1,化驗分析值爲A，對儀表進行標定時儀表讀數仍爲M1,這時只須調整儀表讀數等于A即可;取樣時儀表讀數爲M1,化驗分析值爲A,對儀表進行標定時儀表讀數改變爲M2，這時就不能將調整儀表讀數等于A,超聲波測厚儀而應將儀表讀數調整爲1MA×M2。

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文章分類：技術知識

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