日本GASTEC 異丙基苯檢測管122DL
詳細(xì)介紹
，GASTEC異丙基苯C6H5CH(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。異丙基苯C6H5CH(CH3)2檢測管122DL采用自然擴(kuò)散的方式。其特點：簡潔，輕巧，方便多用、直接讀數(shù)、不需取樣設(shè)備。
被動擴(kuò)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(kuò)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)行更長時間的檢測
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%
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日本GASTEC 異丙基苯檢測管122DL
