Gastec 136H Quick-measuring Detector tubes Methyl bromide CH3Br (10~600ppm)
ManufacturerGastec(View more products from this manufacturer)
Model136H
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Indicator: 20 to 300 ppm
Measuring Range:
+ 10 to 20 ppm, Number of Pump Strokes 2
+ 20 to 300 ppm, Number of Pump Strokes 1
+ 300 to 600 ppm, Number of Pump Strokes 1/2
Sampling Time: 1.5 minutes 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 20 to 100 ppm), 5% (for 100 to 300 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 | 4 ppm (n=2) | |||
| 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 20 to 100 ppm), 5% (for 100 to 300 ppm) | |||
| Shelf Life | 3 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 |
| Cl2, Br2, NOx | + | Yellow | |
| Saturated halogenated HCs | + | Yellow |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Chlorobromomethane | 0.9 | 1 | 18 to 270 ppm |
| 1,2-Dibromoethane | 0.7 | 1 | 14 to 210 ppm |
| n-Butyl Bromide | 1.2 | 1 | 24 to 360 ppm |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 1 ppm | - | 10 to 15% |
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