Performance
| Measuring Range |
2 to 600 ppm |
| Sampling Hours |
1 to 10 hours |
| Detecting Limit |
2 ppm (10 hours) |
| Colour Change |
Yellow → Reddish Brown |
| Reaction Principle |
CH3COCH3 + (NH2OH)3H3PO4 → H3PO4
H3PO4 + Base → Phosphate |
| Coefficient of Variation |
10% (for 20 to 600 ppm-hr) |
| Shelf Life |
2 Years |
| Corrections for temperature & humidity |
Temperature correction is necessary |
| Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below. |
Possible coexisting substances and their interferences
(NOTE)
| Substance |
Concentration |
Interference |
Change colour by itself to |
| Aldehydes |
|
+ |
Reddish brown |
| Ketones |
|
+ |
Reddish brown |
| Acid gases |
|
+ |
Reddish brown
(Unclear demarcation) |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
Measuring Range |
| Acetone |
0.7 |
1.4 to 420 ppm |
| Methyl isobutyl ketone |
2.0 |
4 to 1200 ppm |
| Acetaldehyde |
0.6 |
1.2 to 360 ppm |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 200 ppm |
300 ppm |
1.7 to 11.4% |
