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简单介绍：
甲醛气体检测管91D HCHO，检测范围Measuring Range 0.1 to 20 ppm Sampling Hours 1 to 10 hours Detecting Limit 0.05 ppm (10 hours) 甲醛气体检测管价格，甲醛气体检测管91D HCHO
详情介绍：
甲醛气体检测管91D HCHO Formaldehyd No.91D
HCHO
| Performance |
Measuring Range | 0.1 to 20 ppm |
Sampling Hours | 1 to 10 hours |
Detecting Limit | 0.05 ppm (10hours) |
Color Change | Yellow → ReddishBrown |
Reaction Principle | 3HCHO +(NH2OH)3H3PO4 →H3PO4 |
| Coefficient ofVariation | 10% (for 1 to 20 ppm-hr) |
| ShelfLife | 1 Year |
| Correctionsfor temperature & humidity | Unnecessary |
| Store the tubes inthe refrigerator to keep at 10oC (50oF) orbelow. | |
| Possible coexisting substances and theirinterferences | (NOTE) |
Substance | Interference | Change colour byitself to |
Aldehydes, Ketones,Acid gases | + | Reddishbrown |
| Othersubstance measurable with this detectortube |
Substance | CorrectionFactor | SamplingTime | MeasuringRange |
Acetaldehyde | 1.0 | 1 to 10 hours | 0.1 to 20 ppm |
Furfural | 3.0 | 1 to 10 hours | 0.3 to 60 ppm |
Methyl ethylketone | 1.25 | 1 to 10 hours | 0.125 to 25ppm |
| Calibration gasgeneration | Diffusion tubemethod | |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 0.3ppm | 7.0to 73% |