Indicator: 20-500 ppm
Measuring Range: 20-500 ppm, Number of Pump Strokes 2
Sampling Time: 2 minute per pump stroke
Colour Change: Yellow → Blackish brown → Pale blue after few minutes
Reaction Principle: CH3CO2CH2CH2CH3 + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation: 15% (for 20 to 100 ppm), 10% (for 100 to 500 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Detail
Performance
| Measuring Range | 20 to 500 ppm |
| Number of Pump Strokes | 2 |
| Correction Factor | 1 |
| Sampling Time | 2 minutes per pump stroke |
| Detecting Limit | 4 ppm (n=2) |
| Colour Change | Yellow → Blackish brown → Pale blue after few minutes |
| Reaction Principle | CH3CO2CH2CH2CH3 + Cr6+ + H2SO4 → Cr3+ |
| Coefficient of Variation | 15% (for 20 to 100 ppm), 10% (for 100 to 500 ppm) |
| Shelf Life | 2 Years |
| Corrections for temperature & humidity | Temperature correction is necessary |
| Store the tubes at cool and dark place. | |
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Alcohols | + | Dark brown (few minutes later) → pale blue |
|
| Ketones | + | Dark brown (few minutes later) → pale blue |
|
| Esters | + | Dark brown (few minutes later) → pale blue |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 200 ppm | 250 ppm | 1.7 to 8% |
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