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當(dāng)前位置:首頁產(chǎn)品中心日本氣體檢測管日本174D丁二烯檢測管1.56-240ppm
產(chǎn)品簡介:日本174D丁二烯檢測管1.56-240ppm
產(chǎn)品型號:174D
更新時間:2024-03-12
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RELATED ARTICLES被動擴散式檢測管是用來測定較長時間下氣體濃度的時量平均值(TWA),采用自然擴散的方式。 這種檢測管里面填充有吸附劑及反應(yīng)劑,氣體以一定的速率被均勻吸附,從而出現(xiàn)較為明顯均勻的變色。 檢測工作場所人員的有害氣體暴露量時,用右圖的檢測管夾(710)放置在人員衣領(lǐng)處即可。 檢測有害氣體在工作場所的分布時,把該檢測管固定放置一段時間后就可檢測出來。也可用來進(jìn)行長時間的檢測。 | |
特點 簡潔,輕巧,方便多用 直接讀數(shù) 不需取樣設(shè)備 圖例 A-切斷處 B-吸附劑 C-檢測劑 | 檢測管夾 No. 710 |
Measuring Range | 1.3 to 200 ppm |
Sampling Hours | 1 to 8 hours |
Detecting Limit | 1.3 ppm (8 hours) |
Colour Change | Reddish purple → Pale brown |
Reaction Principle | CH2:CHCH:CH2 + MnO4 仺 Pale brown product |
Coefficient of Variation | 10% (for 10 to 200 ppmr) |
Shelf Life | 2 Years |
Corrections for temperature & humidity | Temperature correction is necessary |
Store the tubes at cool and dark place. |
Substance | Interference | Change colour by itself to |
Unsaturated hydrocarbons | + | Pale brown |
Substance | Correction Factor | Measuring Range |
Ethylene | Factor: 1.2 | 1.5 to 240 ppm |
Vinyl chloride | Factor: 1.2 | 1.5 to 240 ppm |
Isoprene | Factor: 2.0 | 2.5 to 400 ppm |
Trans-1,2-Dichloroethylene | Factor: 3.0 | 3.8 to 600 ppm |
Calibration gas generation | Permeation tube method |
TLV-TWA | TLV-STEL | Explosive range |
2 ppm | - | 2.0 to 12% |