Gastec 136LL Quick-measuring Detector tubes Methyl bromide CH3Br (0.1~3ppm)
ManufacturerGastec(View more products from this manufacturer)
Model136LL
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Indicator: 0.1 to 1.2 ppm
Measuring Range:
+ 0.1 to 1.2 ppm, Number of Pump Strokes 2
+ 1.2 to 3.0 ppm, Number of Pump Strokes 1
Sampling Time: 3 minute per pump stroke
Colour Change: White → Pale purple
Reaction Principle: CH3Br + CrO3 + H2S2O7 → Br2
Coefficient of Variation: 10% (for 0.1 to 0.4 ppm), 5% (for 0.4 to 1.2 ppm
Nr. of tests: 5
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 | 3 minutes per pump stroke | ||
| Detecting Limit | 0.02 ppm (n=2) | ||
| Colour Change | White → Pale purple | ||
| Reaction Principle | CH3Br + CrO3 + H2S2O7 → Br2 | ||
| Coefficient of Variation | 10% (for 0.1 to 0.4 ppm), 5% (for 0.4 to 1.2 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 |
| Chlorine |  5/2 |
+ | Pale purple(2ppm) |
| Trichloroethylene | 1/1 |
+ | Pale purple(1ppm) |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 1 ppm | - | 10 to 15% |
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