Gastec 111L Quick-measuring Detector tubes Methanol CH3OH (20-1000ppm)
ManufacturerGastec(View more products from this manufacturer)
Model111L
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Indicator: 40 to 1000 ppm
Measuring Range:
+ 20 to 40 ppm, Number of Pump Strokes 2
+ 40 to 1000 ppm, Number of Pump Strokes 1
Sampling Time: 2 minute per pump stroke
Colour Change: Pink → Pale blue
Reaction Principle: CH3OH + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation: 10% (for 40 to 200 ppm), 5% (for 200 to 1000 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 | 15 ppm (n=2) | ||
| Colour Change | Pink → Pale blue | ||
| Reaction Principle | CH3OH + Cr6+ + H2SO4 → Cr3+ | ||
| Coefficient of Variation | 10% (for 40 to 200 ppm), 5% (for 200 to 1000 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 | |
| Acetone |  1000 ppm |
+ | No discolouration up to 1000 ppm |
| Ethyl Acetate |  500ppm |
No | No discolouration up to 500 ppm |
| Toluene | 300ppm |
No | No discolouration up to 300 ppm |
| Benzene | 70ppm |
No | No discolouration |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Ethylene Chlorohydrine | by scale | 3 | 80 to 200 ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 200 ppm (2014) | 250 ppm (2014) | 6 to 36% |
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