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Indicator: 20 ~ 600 ppm
Measuring Range: 2 ~ 600 ppm
Sampling Hours: 1 to 10 hours
Colour Change: Yellow → Reddish Brown
Reaction Principle: 3CH3COC2H5+ (NH2OH)3H3PO4 → H3PO4, H3PO4 + Base → Phosphate
Coefficient of Variation: 10% (for 20 to 600 ppm-hr)
Nr. of tests: 10
| Measuring Range | 2 to 600 ppm |
| Sampling Hours | 1 to 10 hours |
| Detecting Limit | 2 ppm (10 hours) |
| Colour Change | Yellow → Reddish Brown |
| Reaction Principle | 3CH3COC2H5+ (NH2OH)3H3PO4 → H3PO4 H3PO4 + Base → Phosphate |
| Coefficient of Variation | 10% (for 20 to 600 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. | |
| Substance | Concentration | Interference | Change colour by itself to |
| Aldehydes | + | Reddish brown | |
| Ketones | + | Reddish brown | |
| Acid gases | + | Reddish brown (Unclear demarcation) |
| Substance | Correction Factor | Measuring Range |
| Acetone | 0.7 | 1.4 to 420 ppm |
| Methyl isobutyl ketone | 2.0 | 4 to 1200 ppm |
| Acetaldehyde | 0.6 | 1.2 to 360 ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 200 ppm(2014) | 300 ppm(2014) | 1.7 to 11.4% |
