日本gastec公司3D氨气检测管量程1.6-650ppm 产品介绍:
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。 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。 |
特点 简洁,轻巧,方便多用 直接读数 不需取样设备 图例  A-切断处 B-吸附剂 C-检测剂 |  检测管夹 No. 710 |
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日本gastec公司3D氨气检测管量程1.6-650ppm Performance
Measuring Range | 2.5 to 1000 ppm |
Sampling Hours | 0.5 to10 hours |
Detecting Limit | 0.5 ppm (10 hours) |
Colour Change | Purple → Yellow |
Reaction Principle | 2NH3 + H2SO4 → (NH4)2SO4 |
Coefficient of Variation | 10% (for 25 to 500 ppm-hr) |
Shelf Life | 3 Years |
Corrections for temperature & humidity | Temperature correction is necessary |
Store the tubes at cool and dark place. |
Possible coexisting substances and their interferences (NOTE)
Substance | Concentration | Interference | Change colour by itself to |
Amines, Hydrazine | | + | Yellow |
Aromatic amines | | No | No |
Other substance measurable with this detector tube
Substance | Correction Factor | Sampling Time | Measuring Range |
Dimethylamine | 0.75 | 0.5 to 10 hours | 1.9 to 750 ppm |
N,N-Dimethylethylamine | 1.6 | 0.5 to 10 hours | 4 to 1600 ppm |
Hydrazine | 0.65 | 0.5 to 10 hours | 1.6 to 650 ppm |
Triethylamine | 2.1 | 0.5 to 10 hours | 5.3 to 2100 ppm |
Calibration gas generation | Permeation tube method |
TLV-TWA | TLV-STEL | Explosive range |
25 ppm | 35 ppm | 15 to 28% |