Methyl Bromide Detection Tubes (10 to 100 ppm)
Gastec Detection Tube No. 136L measures methyl Bromide with a range of 2.5 to 200 ppm.
- 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: 1.5 minutes per pump stroke
- Detecting Limit: 0.5 ppm (4 pump strokes)
- Reaction Principle:
- CH3Br + I2O5+ H2S2O7 → Br2
- Br2 + O-Tolidine → Yellow product
- Corrections for temporary & humidity: Unnecessary
- Relative Standard Deviation: 10% (for 10 to 20 ppm), 5% (for 20 to 100 ppm)
- Changes from White to Yellow
- 2 Year Shelf Life
- Store the tubes at cool and dark place.
- Comes in a Box of 5 pre tubes and 5 detector tubes
Possible coexisting substances and their interferences:
| Substance |
Interference |
Changes color by itself to |
| Bromine, Chlorine |
+ |
Yellow |
| Nitrogen oxides |
+ |
Yellow |
| Saturated halogenated hydrocarbons |
+ |
Yellow |
| Carbon tetrachloride and unsaturated halogenated hydrocarbons are trapped in the pretreatment tube |
Other substance measurable with this detector tube:
| Substance: |
Correction Factor: |
No. of Pump Strokes: |
Measuring Range:
(ppm) |
| Benzyl bromide |
by scale |
1 |
10 to 100 |
| Bromoform |
by scale |
1 |
1 to 50 |
| n-Butyl Bromide |
1.0 |
1 |
10 to 100 |
| Chloro bromomethane |
1.1 |
1 |
11 to 110 |
| 1,1-Dibromoethane |
0.7 |
1 |
7 to 70 |
| 1,2-Dibromoethane |
0.8 |
1 |
8 to 80 |
| Dibromomethane |
0.5 |
1 |
5 to 50 |
| Ethyl Bromide |
2.0
1.0
0.25 |
1/2
1
4 |
100 to 200
10 to 100
2.5 to 10 |
Methyl Bromide Detection Tubes (10 to 100 ppm)
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