| Acetaldehyde | CH3CHO | NO.92 | |
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| Performance |
|
Measuring Range |
5 to10 ppm |
10 to 300 ppm |
300 to 750 ppm |
|
Number of Pump Strokes |
4 |
2 |
1 |
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Correction Factor |
0.5 |
1 |
2.5 |
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Sampling Time |
2 minutes per pump stroke |
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|
Detecting Limit |
2 ppm (n=4) |
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Color Change |
Yellow |
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Reaction Principle |
3CH3CHO + (NH2OH)3H3PO4 |
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| Coefficient of Variation | 10% (for 10 to 100 ppm), 5% (for 100 to 300 ppm) | ||
| Shelf Life | 2 Years | ||
| Corrections for temperature & humidity |
Temperature correction is necessary | ||
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Store the tubes in the refrigerator to keep at 10oC (50oF) or below. |
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| 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 |
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Acetone |
2 times |
Plus error |
Produces red stain |
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Methyl ethyl ketone |
6 times |
Plus error |
Produces red stain |
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MIBK |
10 times |
Plus error |
Produces red stain |
| Other substance measurable with this detector tube |
|
Substance |
Correction |
No. of pump strokes |
Measuring range |
|
Diacetyl |
by scale |
3 |
25 to 1500 ppm |
| Calibration gas generation | Diffusion tube method | |
| TLV to TWA | TLV to STEL | Explosive range |
| - | C 25ppm | 4 to 60% |
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| Copyright(c) 2001 GASTEC CORPORATION. All rights reserved. |
Red
H3PO4 + Base
Phosphate