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日本GASTEC 二甲苯檢測管122DL
詳細介紹
二甲苯C6H4(CH3)2檢測管122DL,GASTEC二甲苯C6H4(CH3)2檢測管122DL 檢測范圍3.4-850ppm,檢測管檢測時間在1-10小時左右。二甲苯C6H4(CH3)2檢測管122DL 采用自然擴散的方式。二甲苯C6H4(CH3)2檢測管122DL其特點:簡潔,輕巧,方便多用、直接讀數(shù)、不需取樣設備。
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。也可用來進行更長時間的檢測
日本GASTEC 二甲苯檢測管122DL
Toluene | 22DL |
C6H5CH3 |
Performance
Measuring Range | 2 to 500 ppm |
Sampling Hours | 1 to 10 hours |
Detecting Limit | 2 ppm (10 hours) |
Colour Change | White → Brown |
Reaction Principle | Toluene react with formaldehyde to form condensation polymer, which is brown in colour. |
Coefficient of Variation | 10% (for 20 to 500 ppm-hr) |
Shelf Life | 2 Years |
Corrections for temperature & humidity | Temperature correction is necessary |
Store the tubes at cool and dark place. |
Possible coexisting substances and their interferences
Substance | Concentration | Interference | Change colour by itself to |
Aromatic hydrocarbons | + | Brown | |
Alcohols, Ketones, Esters | 亝 30ppm | No | No |
Other substance measurable with this detector tube
Substance | Correction Factor | Sampling Time | Measuring Range |
Xylene | Factor: 1.7 | 1 to 10 | 3.4 to 850 ppm |
Ethyl benzene | Factor: 1.4 | 1 to 10 | 2.8 to 700 ppm |
Cumene | Factor: 1.7 | 1 to 10 | 3.4 to 850 ppm |
Benzene | Factor: 1.2 | 1 to 10 | 2.4 to 600 ppm |
Stylene | Factor: 13 | 1 to 10 | 26 to 6500 ppm |
Calibration gas generation | Diffusion tube method |
TLV-TWA | TLV-S | Explosive range |
20 ppm | - | 1.4 to 6.7% |
日本GASTEC 二甲苯檢測管122DL
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