| Methyl bromide | CH3Br | NO.136L |
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| Performance |
|
Measuring Range |
2.5 to 10 ppm |
10 to 100 ppm |
100 to 200 ppm |
|
Number of Pump Strokes |
4 |
1 |
1/2 |
|
Correction Factor |
1/4 |
1 |
2 |
|
Sampling Time |
3 minutes per pump stroke |
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|
Detecting Limit |
0.5 ppm (n=4) |
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|
Color Change |
White |
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Reaction Principle |
Methyl bromide produce intermediate product by oxidizing agent |
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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 color by itself |
|
Chlorine, Bromine, NOx |
- |
Plus error |
Produce yellow stain |
|
Saturated halogenated hydrocarbons |
- |
Plus error |
Produce yellow stain |
| Other substance measurable with this detector tube |
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Substance |
Correction Factor |
Pump Strokes |
Measuring Range |
|
Chlorobromomethane |
0.9 |
1 |
9 to 90 ppm |
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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 |
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n-Butyl Bromide |
1.0 |
1 |
1 to 100 ppm |
Benzyl bromide
|
Tube 136L Reading (n=1) |
10 |
20 |
40 |
60 |
80 |
100 |
|
Benzyl Bromide Conc. (ppm) |
25 |
75 |
180 |
350 |
580 |
850 |
Bromform
|
Tube 136L Reading (n=1) |
10 |
20 |
40 |
60 |
80 |
100 |
|
Bromform Conc. (ppm) |
1 |
4 |
12 |
24 |
37 |
50 |
| Calibration gas generation | Permeation tube method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 1ppm | - | 10 to 15% |
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| Copyright(c) 2001 GASTEC CORPORATION. All rights reserved. |
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