产品详情
简单介绍:
二甲苯C6H4(CH3)2检测管122DL,GASTEC二甲苯C6H4(CH3)2检测管122DL 检测范围3.4-850ppm,检测管检测时间在1-10小时左右。二甲苯C6H4(CH3)2检测管122DL 采用自然扩散的方式。二甲苯C6H4(CH3)2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。
详情介绍:
二甲苯C6H4(CH3)2检测管122DL
二甲苯C6H4(CH3)2检测管122DL,GASTEC二甲苯C6H4(CH3)2检测管122DL 检测范围3.4-850ppm,检测管检测时间在1-10小时左右。二甲苯C6H4(CH3)2检测管122DL 采用自然扩散的方式。二甲苯C6H4(CH3)2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。
二甲苯C6H4(CH3)2检测管122DL,GASTEC二甲苯C6H4(CH3)2检测管122DL 检测范围3.4-850ppm,检测管检测时间在1-10小时左右。二甲苯C6H4(CH3)2检测管122DL 采用自然扩散的方式。二甲苯C6H4(CH3)2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有害气体暴露量时,用右图的检测管夹(710)放置在人员衣领处即可。
检测有害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
检测有害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 |
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-STEL | Explosive range |
20 ppm | - | 1.4 to 6.7% |