Indicator: 10~300ppm
Measuring Range: 5 to 300 ppm, Number of Pump Strokes 2
Sampling Time: 2 minute per pump stroke
Colour Change: Yellow → Pale blue
Reaction Principle: (CH3 )2CHCH2CH2OH + Cr6+ + H3PO4 → Cr3+
Coefficient of Variation: 15% (for 5 to 30 ppm), 10% (for 30 to 300 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range | 5 to 300 ppm |
| Number of Pump Strokes | 2 |
| Correction Factor | 1 |
| Sampling Time | 2 minutes per pump stroke |
| Detecting Limit | 1 ppm (n=2) |
| Colour Change | Yellow → Pale blue |
| Reaction Principle | (CH3 )2CHCH2CH2OH + Cr6+ + H3PO4 → Cr3+ |
| Coefficient of Variation | 15% (for 5 to 30 ppm), 10% (for 30 to 300 ppm) |
| Shelf Life | 3 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 | + | Pale blue |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 100 ppm (2014) | 125 ppm (2014) | 1.2 to 9% |
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