Performance
| Measuring Range |
2 to 500 ppm |
| Sampling Hours |
1 to 10 hours |
| Detecting Limit |
2 ppm (10 hours) |
| Colour Change |
White → Brown |
| Reaction Principle |
Toluene react with formaldehyde to form condensation polymer, which is brown in colour. |
| Coefficient of Variation |
10% (for 20 to 500 ppm-hr) |
| Shelf Life |
2 Years |
| Corrections for temperature & humidity |
Temperature correction is necessary |
| Store the tubes at cool and dark place. |
Possible coexisting substances and their interferences
(NOTE)
| Substance |
Concentration |
Interference |
Change colour by itself to |
| Aromatic hydrocarbons |
|
+ |
Brown |
| Alcohols, Ketones, Esters |
30ppm |
No |
No |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
Sampling Time |
Measuring Range |
| Xylene |
Factor: 1.7 |
1 to 10 |
3.4 to 850 ppm |
| Ethyl benzene |
Factor: 1.4 |
1 to 10 |
2.8 to 700 ppm |
| Cumene |
Factor: 1.7 |
1 to 10 |
3.4 to 850 ppm |
| Benzene |
Factor: 1.2 |
1 to 10 |
2.4 to 600 ppm |
| Stylene |
Factor: 13 |
1 to 10 |
26 to 6500 ppm |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 20 ppm |
- |
1.4 to 6.7% |
