Gastec 136L Quick-measuring Detector tubes Methyl bromide CH3Br (2.5~200ppm)
ManufacturerGastec(View more products from this manufacturer)
Model136L
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Indicator: 10 to 100 ppm
Measuring Range:
+ 2.5 to 10 ppm, Number of Pump Strokes 4
+ 10 to 100 ppm, Number of Pump Strokes 1
+ 100 to 200 ppm`, Number of Pump Strokes 1/2
Sampling Time: 1.5 minute per pump stroke
Colour Change: White → Yellow
Reaction Principle: 2CH3Br +I2O5+ H2S2O7 → Br 2, Br 2 +O-Tolidine → Yellow product
Coefficient of Variation: 10% (for 10 to 20 ppm), 5% (for 20 to 100 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 | 1.5 minutes per pump stroke | |||
| Detecting Limit | 0.5 ppm (n=4) | |||
| Colour Change | White → Yellow | |||
| Reaction Principle | 2CH3Br +I2O5+ H2S2O7 → Br 2 Br 2 +O-Tolidine → Yellow product |
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| Coefficient of Variation | 10% (for 10 to 20 ppm), 5% (for 20 to 100 ppm) | |||
| Shelf Life | 2 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 |
| Chlorine, Bromine, NOx | + | Yellow | |
| Saturated halogenated hydrocarbons | + | Yellow |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Chlorobromomethane | 1.1 | 1 | 11 to 110 ppm |
| 1,1-Dibromoethane | 0.7 | 1 | 7 to 70 ppm |
| 1,2-Dibromoethane | 0.8 | 1 | 8 to 80 ppm |
| Dibromomethane | 0.5 | 1 | 5 to 50 ppm |
| Ethyl Bromide | 1.0 | 1/2, 1, 4 | 2.5 to 200 ppm |
| n-Butyl Bromide | 1.0 | 1 | 10 to 100 ppm |
| Benzyl bromide | by scale | 1 | 10 to 100 ppm |
| Bromoform | by scale | 1 | 1 to 50 ppm |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 1 ppm | - | 10 to 15% |
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