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Term Tubes » A, B, F, M, P & V » 81L |
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Acetic acid |
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NO.81L |
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CH3CO2H |
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Performance |
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Measuring Range |
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0.125 to 0.25 ppm |
0.25 to 10 ppm |
10 to 25 ppm |
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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 |
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Coefficient of Variation |
10% (for
0.25 to 3 ppm), 5% (for 3 to
10 ppm) |
| Shelf
Life |
2 Years |
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Corrections for temperature
& humidity |
Temperature correction is
necessary |
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Store the tubes at in the
refrigerator to keep at
10ºC(50ºF) or below. |
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Possible coexisting substances and
their interferences
(NOTE) |
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Substance |
Concentration |
Interference |
Change colour by itself to |
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Ammonia |
Higher than 2 times |
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No |
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Chlorine, sulphur dioxide,
Nitrogen dioxide |
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+ |
Pale Yellow |
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Formic Acid, Acetic
anhydride |
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+ |
Pale Yellow |
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Other substance measurable with this
detector tube |
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Substance |
Correction Factor |
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 |
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Valeric acid |
Factor: 1.5 |
1 |
0.38 to 15 ppm |
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Calibration gas generation |
Diffusion tube method |
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TLV-TWA |
TLV-STEL |
Explosive range |
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15 ppm |
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Gastec Tubes and
Sampling Pump
