Gastec 81 Quick-measuring Detector tubes Acetic acid CH3CO2H (1~100 ppm)
ManufacturerGastec(View more products from this manufacturer)
ModelCH3CO2H81
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Indicator: 2~50 ppm
Measuring Range:
+ 1 ~ 2 ppm, 2 Number of Pump Strokes
+ 2 ~ 50 ppm, 1 Number of Pump Strokes
+ 50 ~ 100 ppm, 1/2 Number of Pump Strokes
Sampling Time: 45 seconds per pump stroke
Colour Change: Pink → Yellow
Reaction Principle: CH3CO2H + Base → Reaction product
Coefficient of Variation: 10% (for 2 to 10 ppm), 5% (for 10 to 50 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 | 45 seconds per pump stroke | |||
| Detecting Limit | 0.2 ppm (n=2) | |||
| Colour Change | Pink → Yellow | |||
| Reaction Principle | CH3CO2H + Base → Reaction product | |||
| Coefficient of Variation | 10% (for 2 to 10 ppm), 5% (for 10 to 50 ppm) | |||
| Shelf Life | 3 Years | |||
| Corrections for temperature & humidity | Humidity correction is necessary | |||
| Store the tubes at cool and dark place. | ||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Hydrogen chloride, Hydrogen cyanide,Nitric acid | 3 times or higher | + | Yellow |
| Chlorine, sulphur dioxide, Nitrogen dioxide | 1/2 times or higher | + | Yellow |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Acetic anhydride | Factor: 0.3 | 1 | 0.6 to 15 ppm |
| Acrylic acid | Factor: 1.0 | 1 | 2 to 50 ppm |
| Formic acid | Factor: 2.6 | 1 | 5.2 to 130 ppm |
| Isovaleric acid | Factor: 1.0 | 1 | 2 to 50 ppm |
| Maleic anhydride | Factor: 0.4 | 1 | 0.8 to 20 ppm |
| Methacrylic acid | Factor: 0.9 | 1 | 1.8 to 45 ppm |
| Propionic acid | Factor: 1.5 | 1 | 3to 75 ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 10 ppm(2014) | 15 ppm(2014) | - |
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