Acetaldehyde |
NO.92L |
| CH3CHO |  |
 |
Performance
| Measuring Range |
|
|
| Number of Pump Strokes |
|
|
| Correction Factor |
|
|
| Sampling Time | 3 minutes per pump stroke | |
| Detecting Limit | 0.2 ppm (n=1) | |
| Colour Change | Yellow → Brown | |
| Reaction Principle | 3CH3CHO + (NH2OH)3H3PO4 → H3PO4 H3PO4 + Base → Phosphate |
|
| Coefficient of Variation | 10% (for 1 to 6 ppm), 5% (for 6 to 20 ppm) | |
| Shelf Life | 2 Years | |
| Corrections for temperature & humidity | Temperature correction is necessary | |
| @ | ||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Ammonia |  30 ppm |
No | No |
| Acetic acid |  2 times |
+ | Brown |
| Acids | + | Brown | |
| Aldehydes | + | Brown | |
| Ketones | + | Brown |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 25 ppm@ | 4 to 60% |
