***CH2:CHCl检测管174D
***CH2:CHCl检测管174D,GASTEC***CH2:CHCl检测管174D检测范围1.56-240ppm,检测管检测时间在1-10小时左右。 ***CH2:CHCl检测管174D采用自然扩散的方式。***CH2:CHCl检测管174D其特点:简洁,轻巧,方便多用、直接读数、不需取样设备。
***CH2:CHCl检测管174D,GASTEC***CH2:CHCl检测管174D检测范围1.56-240ppm,检测管检测时间在1-10小时左右。 ***CH2:CHCl检测管174D采用自然扩散的方式。***CH2:CHCl检测管174D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
1,3-Butadiene |
NO.174D |
CH2:CHCH:CH2 |
Performance
Measuring Range | 1.3 to 200 ppm |
Sampling Hours | 1 to 8 hours |
Detecting Limit | 1.3 ppm (8 hours) |
Colour Change | Reddish purple → Pale brown |
Reaction Principle | CH2:CHCH:CH2 + MnO4 仺 Pale brown product |
Coefficient of Variation | 10% (for 10 to 200 ppmr) |
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 | Interference | Change colour by itself to |
Unsaturated hydrocarb*** | + | Pale brown |
Other substance measurable with this detector tube
Substance | Correction Factor | Measuring Range |
Ethylene | Factor: 1.2 | 1.5 to 240 ppm |
Vinyl chloride | Factor: 1.2 | 1.5 to 240 ppm |
Isoprene | Factor: 2.0 | 2.5 to 400 ppm |
Trans-1,2-Dichloroethylene | Factor: 3.0 | 3.8 to 600 ppm |
Calibration gas generation | Permeation tube method |
TLV-TWA | TLV-STEL | Explosive range |
2 ppm | - | 2.0 to 12% |
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