Performance
| Measuring Range |
0.1 to 20 ppm |
| Sampling Hours |
1 to 10 hours |
| Detecting Limit |
0.05 ppm (10 hours) |
| Colour Change |
Yellow → Reddish Brown |
| Reaction Principle |
3HCHO + (NH2OH)3 H3PO4 → H3PO4
H3PO4 + Base+Phosphate
|
| Coefficient of Variation |
10% (for 1 to 20 ppm-hr) |
| Shelf Life |
1 Year |
| Corrections for temperature & humidity |
Unnecessary |
| Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below. |
Possible coexisting substances and their interferences
(NOTE)
| Substance |
Interference |
Change colour by itself to |
| Aldehydes, Ketones, Acid gases |
+ |
Reddish brown |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
Sampling Time |
Measuring Range |
| Acetaldehyde |
1.0 |
1 to 10 hours |
0.1 to 20 ppm |
| Furfural |
3.0 |
1 to 10 hours |
0.3 to 60 ppm |
| Methyl ethyl ketone |
1.25 |
1 to 10 hours |
0.125 to 25 ppm |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| - |
C 0.3 ppm |
7.0 to 73% |
