产品品牌：GASTEC
产品型号：GASTEC
氨气检测管3D
氨气检测管3D，GASTEC氨气检测管3D检测范围2.5-1000ppm，检测管检测时间在1-10小时左右。氨气检测管3D采用自然扩散的方式。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
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% |
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