| C6H5CH3 |
 |
Performance
| Measuring Range |
| 1 to 2 ppm |
2 to 50 ppm |
50 to 100 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
1.5 minutes per pump stroke |
| Detecting Limit |
0.5 ppm (n=4) |
| Colour Change |
White → Brown |
| Reaction Principle |
C6H5CH3 + I2O5 + H2SO4 → I2 |
| Coefficient of Variation |
10% (for 2 to 100 ppm), 5% (for 10 to 50 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 |
Interference |
Change colour by itself to |
| Acetylene, Ethylene, Hexane |
No |
No |
| Alcohols, Ketones, Esters |
No |
No |
| Aromatic hydrocarbons |
+ |
Brown |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
| Xylene |
4,2,1 |
1,2,4 |
2 to 200 ppm |
Calibration Scale
Ethyl Benzene Conc. (ppm)
Tube 122L Reading (n = 2) |
Calibration Scale
Cumene Concentration (ppm)
Tube 122L Reading (n= 2) |
Calibration Scale
Diethyl Benzene Conc. (ppm)
Tube 122L Reading (n=4) |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 20 ppm |
- |
1.4 to 6.7% |
