| Acetic acid | CH3CO2H | NO.81L | |
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| Performance |
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Measuring Range |
0.125 to 0.25 ppm |
0.25 to 10 ppm |
10 to 25 ppm |
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Number of Pump Strokes |
2 |
1 |
1/2 |
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Correction Factor |
1/2 |
1 |
2.5 |
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Sampling Time |
1.5 minutes per pump stroke |
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Detecting Limit |
0.05 ppm (n=2) |
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Color Change |
Pink |
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Reaction Principle |
Acetic acid neutralizes sodium hydroxide to discolor indicator to Pale yellow. |
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| Coefficient of Variation: | 10% (for 0.25 to 3 ppm), 5% (for 3 to 10 ppm) | ||
| Shelf Life | 2 Years | ||
| Corrections for temperature & humidity |
Temperature correction is necessary | ||
| Store the tubes at cool and dark place. | |||
| Possible coexisting substances and their interferences | (NOTE) |
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Substance |
Concentration |
Interference |
Change color by itself |
| Ammonia | Higher than 2 times | Minus error | No discoloration |
| Chlorine, Sulfur dioxide, Nitrogen dioxide | - | Plus error | Pale Yellow |
| Formic Acid, Acetic anhydride | - | Plus error | Pale Yellow |
| Other substance measurable with this detector tube |
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Substance |
Correction |
No. of pump strokes |
Measuring range |
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Acetic anhydride |
Factor: 0.6 |
1 |
0.15 to 6 ppm |
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Acrylic acid |
Factor: 1.8 |
1 |
0.45 to 18 ppm |
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Butyric acid |
Factor:1.3 |
1 |
0.325 to 13 ppm |
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Formic acid |
Factor: 2.0 |
1 |
0.5 to 20 ppm |
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Isovaleric acid |
Factor: 1.5 |
1 |
0.38 to 15 ppm |
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Methacrylic acid |
Factor 1.4 |
1 |
0.35 to 14 ppm |
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Propionic acid |
Factor: 1.0 |
1 |
0.25 to 10 ppm |
| Valeric acid | Factor: 1.5 | 1 | 0.38 to 15 ppm |
| Calibration gas generation | Diffusion tube method | |
| TLV-TWA | TLV-STEL | Explosive range |
| - | 15ppm | - |
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| Copyright(c) 2001 GASTEC CORPORATION. All rights reserved. |
Pale Yellow