| Hydrocarbons (Lower Class) | C2 to C7 | NO.103 |
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| Performance |
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Measuring Range |
0.05 to 0.1% |
0.1 to 1.2% |
1.2 to 2.4% |
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Number of Pump Strokes |
2 |
1 |
1/2 |
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Correction Factor |
1/2 |
1 |
2 |
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Sampling Time |
2 minutes per pump stroke |
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Detecting Limit |
0.01% (n=2) |
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Color Change |
Yellowish brown |
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Reaction Principle |
Lower class hydrocarbons reduce chromic acid to produce greenish brown in color. |
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| Coefficient of Variation | 10% (for 0.1 to 1.2 %) | ||
| Shelf Life | 2 Years | ||
| Corrections for temperature & humidity |
Unnecessary | ||
| Store the tubes at cool and dark place. | |||
| Possible coexisting substances and their interferences | (NOTE) |
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Substance |
Concentration |
Interference |
Change color by itself |
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Carbon monoxide |
- |
No effect |
No discoloration |
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Methane, Ethane |
- |
No effect |
No discoloration |
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Other hydrocarbons |
- |
Plus error |
Produce similar stain |
| Other substance measurable with this detector tube |
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Substance |
Correction Factor |
Pump Strokes |
Measuring Range |
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Acetylene |
1.5 |
1/2, 1, 2 |
0.075 to 3.6% |
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Butane, Heptane, Isobutane |
0.7 |
1/2, 1, 2 |
0.035 to 1.68% |
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Ethylene |
7.0 |
1/2, 1, 2 |
0.35 to 16.8% |
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Hexane |
0.5 |
1/2, 1, 2 |
0.025 to 1.2% |
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Isopentane |
0.9 |
1/2, 1, 2 |
0.045 to 2.16% |
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Pentane |
0.75 |
1/2, 1, 2 |
0.0375 to 1.8% |
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Propane |
1.0 |
1/2, 1, 2 |
0.05 to 2.4% |
| Calibration gas generation | High pressure gas cylinder method | |
| TLV-TWA | TLV-STEL | Explosive range |
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| Copyright(c) 2001 GASTEC CORPORATION. All rights reserved. |
Greenish brown