Gastec 111LL Quick-measuring Detector tubes Methanol CH3OH (2 ~ 56 ppm)
ManufacturerGastec(View more products from this manufacturer)
Model111LL
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Indicator: 2 to 20 ppm
Measuring Range:
+ 2 to 20 ppm, Number of Pump Strokes 4
+ 20 to 56 ppm, Number of Pump Strokes 2
Sampling Time: 2 minute per pump stroke
Colour Change: Pale yellow → Pale bluish green
Reaction Principle: CH3OH + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation: 15% (for 2 to 5 ppm), 10% (for 5 to 20 ppm)
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 | 2 minutes per pump stroke | ||
| Detecting Limit | 0.2 ppm (n=4) | ||
| Colour Change | Pale yellow → Pale bluish green | ||
| Reaction Principle | CH3OH + Cr6+ + H2SO4 → Cr3+ | ||
| Coefficient of Variation | 15% (for 2 to 5 ppm), 10% (for 5 to 20 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 | + | Pale bluish green | |
| Aromatic hydrocarbons | + | Pale bluish green |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 200 ppm | 250 ppm | 6 to 36% |
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