| C6H4iCH3j2 |
 |
Performance
| Measuring Range |
| 5 to10 ppm |
10 to 250 ppm |
250 to 625 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
1.5 minute per pump stroke |
| Detecting Limit |
1 ppm (n=2) |
| Colour Change |
White → Brown |
| Reaction Principle |
C6H4(CH3)2 + I2O5 + H2SO4 → I2 |
| Coefficient of Variation |
10% (for 10 to 50 ppm), 5% (for 50 to 250 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 |
1000 ppm |
No(Two layers) |
Pale brown
(Whole layer) |
| Acetylene, Hexane |
2000 ppm |
No(Two layers) |
Pale brown
(Whole layer) |
| Toluene |
1/5 |
+ |
Brown |
| Benzene |
1/5 |
+ |
Pale yellow |
Other substance measurable with this detector tube
| Tube 123 Reading (n = 2) |
10 |
20 |
50 |
100 |
| Trimethylbenzene Conc. (ppm) |
10 |
27 |
90 |
300 |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 100 ppm |
150 ppm |
1.0 to 7.0% |
