甲醛氣體檢測管91D HCHO,檢測范圍Measuring Range 0.1 to 20 ppm Sampling Hours 1 to 10 hours Detecting Limit 0.05 ppm (10 hours) 甲醛氣體檢測管價格,甲醛氣體檢測管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-S | Explosive range |
- | C 0.3ppm | 7.0to 73% |