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Indicator: 5 ~ 100 ppm
Measuring Range: 0.5 ~ 100 ppm
Sampling Hours: 1 to 10 hours
Colour Change: Purple → Yellow
Reaction Principle: CH3CO2H + NaOH → CH3CO2Na
Coefficient of Variation: 5% (for 5 to 20 ppm-hr), 10% (for 20 to 100 ppm-hr)
Nr. of tests: 10
| Measuring Range | 0.5 to 100 ppm |
| Sampling Hours | 1 to 10 hours |
| Detecting Limit | 0.2 ppm (10 hours) |
| Colour Change | Purple → Yellow |
| Reaction Principle | CH3CO2H + NaOH → CH3CO2Na |
| Coefficient of Variation | 5% (for 5 to 20 ppm-hr), 10% (for 20 to 100 ppm-hr) |
| Shelf Life | 3 Years |
| Corrections for temperature & humidity | Temperature correction is necessary |
| Store the tubes at cool and dark place. | |
| Substance | Interference | Change colour by itself to |
| Hydrogen chloride, Nitric Acid | + | Yellow |
| Chlorine, Nitrogen dioxide | + | Yellow |
| Hydrogen cyanide, Sulphur dioxide | + | Yellow |
| Substance | Correction Factor | Sampling Time | Measuring Range |
| Formic acid | Factor: 1.1 | 1 to 10 | 0.55 to 110 ppm |
| Acetic anhydride | Factor: 0.6 | 1 to 10 | 0.3 to 60 ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 10 ppm | 15 ppm | 4 to 19.9% |
