Gastec 111 Quick-measuring Detector tubes Methanol CH3OH (0.002~4.5%)
ManufacturerGastec(View more products from this manufacturer)
Model111
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Indicator: 0.02 to 1.5%
Measuring Range:
+ 0.002 to 0.004%, Number of Pump Strokes 4
+ 0.004 to 0.02%, Number of Pump Strokes 2
+ 0.02 to 1.5%, Number of Pump Strokes 1
+ 1.5 to 4.5%, Number of Pump Strokes 1/2
Sampling Time: 1 minute per pump stroke
Colour Change: Pink → Pale blue
Reaction Principle: CH3OH + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation: 15% (for 0.02 to 0.5 %), 10% (for 0.5 to 1.5 %)
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 | 1 minute per pump stroke | ||||
| Detecting Limit | 0.0004% (n=4) | ||||
| Colour Change | Pink → Pale blue | ||||
| Reaction Principle | CH3OH + Cr6+ + H2SO4 → Cr3+ | ||||
| Coefficient of Variation | 15% (for 0.02 to 0.5 %), 10% (for 0.5 to 1.5 %) | ||||
| 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 | |
| Carbon dioxide | No | No | |
| Carbon monoxide | No | No | |
| sulphur dioxide | No | No |
| Calibration gas generation | Static gas dilution method |
| TLV-TWA | TLV-STEL | Explosive range |
| 200 ppm | 250 ppm | 6 to 36% |
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