CH3Br |
![](/files/images/icons/arrow_left_48.png) |
Performance
Measuring Range |
10 to 20 ppm |
20 to 300 ppm |
300 to 600 ppm |
|
Number of Pump Strokes |
|
Correction Factor |
|
Sampling Time |
2 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 |
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% |