Gastec 81L Quick-measuring Detector tubes Acetic acid CH3CO2H
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Indicator: 0.5~10.0ppm
Measuring Range:
+ 0.125 to 0.25 ppm, Number of Pump Strokes 2
+ 0.25 to 10 ppm, Number of Pump Strokes 1
+ 10 to 25 ppm, Number of Pump Strokes 1/2
Sampling Time: 1.5 minute per pump stroke
Colour Change: Pink → Pale Yellow
Reaction Principle: CH3CO2H + Base → Reaction product
Coefficient of Variation: 10% (for 0.25 to 3 ppm), 5% (for 3 to 10 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 1.5 minutes per pump stroke | |||
| Detecting Limit | 0.05 ppm (n=2) | |||
| Colour Change | Pink → Pale Yellow | |||
| Reaction Principle | CH3CO2H + Base → Reaction product | |||
| 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 in the refrigerator to keep at 10ºC(50ºF) or below. | ||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Ammonia | Higher than 2 times |  |
No |
| Chlorine, sulphur dioxide, Nitrogen dioxide | + | Pale Yellow | |
| Formic Acid, Acetic anhydride | + | Pale Yellow |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Acetic anhydride | Factor: 0.6 | 1 | 0.15 to 6 ppm |
| Acrylic acid | Factor: 1.8 | 1 | 0.45 to 18 ppm |
| Butyric acid | Factor:1.3 | 1 | 0.325 to 13 ppm |
| Formic acid | Factor: 2.0 | 1 | 0.5 to 20 ppm |
| Isovaleric acid | Factor: 1.5 | 1 | 0.38 to 15 ppm |
| Methacrylic acid | Factor 1.4 | 1 | 0.35 to 14 ppm |
| 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 |
| 10ppm(2014) | 15 ppm(2014) | - |
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