***C6H5CH3检测管122DL
***C6H5CH3检测管122DL，GASTEC***C6H5CH3检测管122DL检测范围2-500ppm，检测管检测时间在1-10小时左右。***C6H5CH3检测管122DL 采用自然扩散的方式。***C6H5CH3检测管122DL其特点：简洁，轻巧，方便多用、直接读数、不需取样设备。
***C6H5CH3检测管122DL，GASTEC***C6H5CH3检测管122DL检测范围2-500ppm，检测管检测时间在1-10小时左右。***C6H5CH3检测管122DL 采用自然扩散的方式。***C6H5CH3检测管122DL其特点：简洁，轻巧，方便多用、直接读数、不需取样设备。
被动扩散式检测管是用来测定较长时间下气体浓度的时量平均值（TWA），采用自然扩散的方式。
这种检测管里面填充有吸附剂及反应剂，气体以一定的速率被均匀吸附，从而出现较为明显均匀的变色
这种检测管里面填充有吸附剂及反应剂，气体以一定的速率被均匀吸附，从而出现较为明显均匀的变色
检测工作场所人员的***气体暴露量时，用右图的检测管夹（710）放置在人员衣领处即可。
检测***气体在工作场所的分布时，把该检测管固定放置一段时间后就可检测出来。也可用来进行更长时间的检测
检测***气体在工作场所的分布时，把该检测管固定放置一段时间后就可检测出来。也可用来进行更长时间的检测
Toluene |
NO.122DL |
| 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 |
| Correcti*** 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 hydrocarb*** | + | 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-STEL | Explosive range |
| 20 ppm | - | 1.4 to 6.7% |
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