| Acetaldehyde | CH3CHO | NO.92M | |
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| Performance |
|
Measuring Range |
2.5 to 5 ppm |
5 to 100 ppm |
|
Number of Pump Strokes |
2 |
1 |
|
Correction Factor |
1/2 |
1 |
|
Sampling Time |
1.5 minutes per pump stroke |
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|
Detecting Limit |
0.25 ppm (n=2) |
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|
Color Change |
Yellow |
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|
Reaction Principle |
3CH3CHO + (NH2OH)3H3PO4 |
|
| Coefficient of Variation | 10% (for 5 to 20 ppm), 5% (for 20 to 100 ppm) | |
| Shelf Life | 2 Years | |
| 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 |
Concentration |
Interference |
Change color by itself |
|
Ammonia |
- |
Minus error |
No discoloration |
|
Acrolein |
3/5 time |
Plus error |
Produces red stain |
|
Acetone |
2 times |
Plus error |
Produces red stain |
|
Methyl ethyl ketone |
6 times |
Plus error |
Produces red stain |
|
MIBK |
10 times |
Plus error |
Produces red stain |
| Calibration gas generation | Diffusion tube method | |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 25ppm | 4 to 60% |
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| Copyright(c) 2001 GASTEC CORPORATION. All rights reserved. |
Red
H3PO4 + Base
Phosphate