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產(chǎn)品簡介:日本gastec公司3D氨氣檢測(cè)管量程1.6-650ppm
產(chǎn)品型號(hào):3D
更新時(shí)間:2024-03-13
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RELATED ARTICLES被動(dòng)擴(kuò)散式檢測(cè)管是用來測(cè)定較長時(shí)間下氣體濃度的時(shí)量平均值(TWA),采用自然擴(kuò)散的方式。 這種檢測(cè)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(cè)工作場(chǎng)所人員的有害氣體暴露量時(shí),用右圖的檢測(cè)管夾(710)放置在人員衣領(lǐng)處即可。 檢測(cè)有害氣體在工作場(chǎng)所的分布時(shí),把該檢測(cè)管固定放置一段時(shí)間后就可檢測(cè)出來。也可用來進(jìn)行長時(shí)間的檢測(cè)。 | |
特點(diǎn) 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(cè)劑 | 檢測(cè)管夾 No. 710 |
Measuring Range | 2.5 to 1000 ppm |
Sampling Hours | 0.5 to10 hours |
Detecting Limit | 0.5 ppm (10 hours) |
Colour Change | Purple → Yellow |
Reaction Principle | 2NH3 + H2SO4 → (NH4)2SO4 |
Coefficient of Variation | 10% (for 25 to 500 ppm-hr) |
Shelf Life | 3 Years |
Corrections for temperature & humidity | Temperature correction is necessary |
Store the tubes at cool and dark place. |
Substance | Concentration | Interference | Change colour by itself to |
Amines, Hydrazine | + | Yellow | |
Aromatic amines | No | No |
Substance | Correction Factor | Sampling Time | Measuring Range |
Dimethylamine | 0.75 | 0.5 to 10 hours | 1.9 to 750 ppm |
N,N-Dimethylethylamine | 1.6 | 0.5 to 10 hours | 4 to 1600 ppm |
Hydrazine | 0.65 | 0.5 to 10 hours | 1.6 to 650 ppm |
Triethylamine | 2.1 | 0.5 to 10 hours | 5.3 to 2100 ppm |
Calibration gas generation | Permeation tube method |
TLV-TWA | TLV-STEL | Explosive range |
25 ppm | 35 ppm | 15 to 28% |
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