Performance
| Measuring Range |
0.5 to 100 ppm |
| Sampling Hours |
1 to 10 hours |
| Detecting Limit |
0.2 ppm (10 hours) |
| Colour Change |
Purple → Yellow |
| Reaction Principle |
CH3CO2H + NaOH → CH3CO2Na |
| Coefficient of Variation |
5% (for 5 to 20 ppm-hr), 10% (for 20 to 100 ppm-hr) |
| Shelf Life |
3 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 |
Interference |
Change colour by itself to |
| Hydrogen chloride, Nitric Acid |
+ |
Yellow |
| Chlorine, Nitrogen dioxide |
+ |
Yellow |
| Hydrogen cyanide, Sulphur dioxide |
+ |
Yellow |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
Sampling Time |
Measuring Range |
| Formic acid |
Factor: 1.1 |
1 to 10 |
0.55 to 110 ppm |
| Acetic anhydride |
Factor: 0.6 |
1 to 10 |
0.3 to 60 ppm |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 10 ppm |
15 ppm |
4 to 19.9% |
