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Indicator: 1000 ~ 25000 ppm
Measuring Range: 100 ~ 25000 ppm
Sampling Hours: 1 to 10 hours
Colour Change: Yellow → Brown
Reaction Principle: C2H5OH + Cr6++ H2SO4 → Cr3+
Coefficient of Variation: 15% (for 1000 to 3000 ppm-hr), 10% (for 3000 to 25000 ppm-hr)
Nr. of tests: 10
| Measuring Range | 100 to 25000 ppm |
| Sampling Hours | 1 to 10 hours |
| Detecting Limit | 0.05 ppm (10 hours) |
| Colour Change | Yellow → Brown |
| Reaction Principle | C2H5OH + Cr6++ H2SO4 → Cr3+ |
| Coefficient of Variation | 15% (for 1000 to 3000 ppm-hr), 10% (for 3000 to 25000 ppm-hr) |
| Shelf Life | 3 Years |
| Corrections for temperature & humidity | Unnecessary |
| Store the tubes at cool and dark place. | |
| Substance | Concentration | Interference | Change colour by itself to |
| Esters | No | No | |
| Other alcohols except IPA | No | No | |
| Isopropyl alcohol | ≧ 1/1 | + | Brown |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | 1000ppm (2014) | 3.3 to 19% |
