| C6H5CH3 |
 |
Performance
| Measuring Range |
| 5 to10 ppm |
10 to 300 ppm |
300 to 690 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
1.5 minutes per pump stroke |
| Detecting Limit |
1 ppm (n=2) |
| Colour Change |
White → Brown |
| Reaction Principle |
C6H5CH3 + I2O5 + H2SO4 → I2 |
| Coefficient of Variation |
10% (for 10 to 100 ppm), 5% (for 200 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 |
| Carbon Monoxide |
¡æ 1000 ppm |
No(Two layers) |
Pale brown |
| Acetylene |
¡æ 2000 ppm |
No(Two layers) |
Pale brown |
| Xylene |
¡æ 1/5 time |
+ |
Brown |
| Hexane |
¡æ 2000 ppm |
No(Two layers) |
Pale brown |
| Benzene |
¡æ 1/5 time |
+ |
Pale yellow |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
Ethyl benzene
|
1.1 |
1 |
11 to 330 ppm |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 20 ppm |
- |
1.4 to 6.7% |
