产品品牌：gastec
产品型号：GASTEC
被动扩散式丙酮检测管151D
被动扩散式丙酮检测管151D，GASTEC丙酮检测管151D检测范围5-1500ppm，检测管检测时间在1-10小时左右。丙酮检测管151D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 | 5 to 1500 ppm |
| Sampling Hours | 1 to 10 hours |
| Detecting Limit | 5 ppm (10 hours) |
| Colour Change | Yellow → Reddish Brown |
| Reaction Principle | CH3COCH3 + (NH2OH)3H3PO4 → H3PO4
H3PO4 + Base → Phosphate |
| Coefficient of Variation | 10% (for 50 to 1500 ppm-hr) |
| Shelf Life | 2 Years |
| Corrections for temperature & humidity | Temperature correction is necessary |
| Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below. |
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Aldehydes,Ketones | | + | Reddish brown |
| Acid gases | | + | Reddish brown
(Unclear demarcation) |
Other substance measurable with this detector tube
| Substance | Correction Factor | Measuring Range |
| Methyl ethyl ketone | 1.3 | 0.5 to 1950 ppm |
| Methyl isobutyl ketone | 2.3 | 11.5 to 3450 ppm |
| Acetaldehyde | 0.8 | 4 to 1200 ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 500 ppm | 750 ppm | 2.1 to 13% |
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