|
|
| Acetic acid |
CH3CO2H |
NO.81D |
| Performance |
Measuring
Range
|
0.5 to 100 ppm |
Sampling Hours
|
1 to 10 hours |
Detecting Limit
|
0.2ppm (10 hours) |
Color Change
|
Purple --->
Yellow |
| Reaction
Principle |
Acetic acid neutralize
alkali to discolor the indicator to yellow. |
| Coefficient
of Variation |
5% (for 5 to 20
ppm-hr), 10% (for 20 to 100 ppm-hr) |
| Shelf
Life |
3 Years |
| Corrections
for temperature & humidity |
Temperature correction
is necessary |
| Store the
tubes at cool and dark place. |
| Possible
coexisting substances and their interferences |
Substance
|
Interference |
Change
color by itself |
Hydrogen chloride, Nitric
Acid
|
Plus error
|
Produce yellow
stain |
Chlorine, Nitrogen dioxide
|
Plus error |
Produce yellow
stain |
Hydrogen cyanide, Sulfur
dioxide
|
Plus error |
Produce yellow
stain |
| Other
substance measurable with this detector tube |
Substance
|
Correction
Factor
|
Sampling
Hours
|
Measuring
Range |
Formic acid
|
1.1
|
1 to 10 hours
|
0.55 to 110 ppm |
Acetic anhydride
|
0.6
|
1 to 10 hours
|
0.3 to 60 ppm |
| Calibration
gas generation |
Diffusion tube method |
TLV-TWA
|
TLV-STEL
|
Explosive
range |
| 10ppm |
15ppm |
4 to 19.9% |
|
