Gastec 106 Quick-measuring Detector tubes Petroleum naphtha (0.5 ~ 28 mg/L)
ManufacturerGastec(View more products from this manufacturer)
Model106
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Indicator: 1 to 14 mg/L
Measuring Range:
+ 0.5 to 1 mg/L, Number of Pump Strokes 2
+ 1 to 14 mg/L, Number of Pump Strokes 1
+ 14 to 28 mg/L, Number of Pump Strokes 1/2
Sampling Time: 45 seconds per pump stroke
Colour Change: Orange → Dark Green
Reaction Principle: Petroleum naphtha + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation: 10% (for 1 to 4 mg/L), 5% (for 4 to 14 mg/L)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 45 seconds per pump stroke | |||
| Detecting Limit | 0.1 mg/L (n=2) | |||
| Colour Change | Orange → Dark Green | |||
| Reaction Principle | Petroleum naphtha + Cr6+ + H2SO4 → Cr3+ | |||
| Coefficient of Variation | 10% (for 1 to 4 mg/L), 5% (for 4 to 14 mg/L) | |||
| 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 colour by itself to |
| sulphur dioxide | 500 ppm | + | Green |
| Hydrogen sulphide | 500 ppm | + | Dark brown (  500 ppm) |
| Acetylene | 3% | + | Dark brown (whole layer) |
| Propane | 0.2% | + | Dark brown (whole layer) |
| Organic solvents | + | Dark green |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Petroleum benzine | 1.0 | 1/2, 1 or 2 | 0.5 to 28 mg/L |
| Petroleum ether | 1.0 | 1/2, 1 or 2 | 0.5 to 28 mg/L |
| Calibration gas generation | Static gas dilution method |
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