Performance |
Measuring Range | 2.5 to 1000ppm |
Sampling Hours | 0.5 to10 hours |
Detecting Limit | 0.5 ppm (10hours) |
Color Change | Purple →Yellow |
Reaction Principle | 2NH3 + H2SO4 → (NH4)2SO4 |
Coefficient ofVariation | 10%(for 25 to 500 ppm-hr) |
ShelfLife | 3 Year |
Correctionsfor temperature & humidity | Temperature correction isnecessary |
Store the tubes atcool and dark place. |
Possible coexisting substances and theirinterferences | (NOTE) |
Substance | Interference | Change colour byitself to |
Amines,Hydrazine | + | Yellow |
Aromatic amines | No |
No |
Othersubstance measurable with this detectortube |
Substance | CorrectionFactor | SamplingTime | MeasuringRange |
Dimethylamine | 0.75 | 0.5 to 10hours | 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 2100ppm |
Calibration gasgeneration | Diffusion tubemethod |
TLV-TWA | TLV-S | Explosive range |
25 ppm | 35ppm | 15 to28% |