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汽油检测管101 CnHm Gasoline Gasoline No.101
CnHm
| Performance |
Measuring Range | 0.015 to 0.03% | 0.03 to 0.6% | 0.6 to 1.2% |
Number of Pump Strokes | 2 | 1 | 1/2 |
Correction Factor | 1/2 | 1 | 2 |
Sampling Time | 1 minute per pump stroke | ||
Detecting Limit | 0.003% (n = 2) | ||
Color Change | Orange → Dark green | ||
Reaction Principle | CnHm + Cr6++ H2SO4 → Cr3+ | ||
| Coefficient of Variation | 10% (for 0.03 to 0.1 %), 5% (for 0.1 to 0.6 %) | ||
| Shelf Life | 3 Years | ||
| Corrections for temperature & humidity | Unnecessary | ||
| Store the tubes at cool and dark place. | |||
| Possible coexisting substances and their interferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Acetylene | 3% | Yes | Produce dark brown to whole layer |
Propane | 0.2% | Yes | Produce dark brown to whole layer |
Aromatic HCs | 500 ppm | Plus error | Produce dark green |
Alcohols, Esters, Ethers | - | Plus error | Produce dark green |
Halogenated HCs. | 5000 ppm | Plus error | Produce dark green |
Hydrogen sulfide | 500 ppm | Plus error | Produce dark green |
Sulfur dioxide | 500 ppm | Plus error | Produce green |
2%)| Other substance measurable with this detector tube |
Substance | Correction | No. of Pump Strokes | Measuring Range |
Heptane | Factor: 1.0 | 1/2, 1 or 2 | 0.015 to 1.2% |
Isooctane | Factor: 0.9 | 1 | 0.027 to 0.54% |
Octane | Factor: 1.2 | 1 | 0.036 to 0.72% |
| Calibration gas generation | Static gas dilution method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 300ppm | 500ppm | 1.4 to 7.6% |