|
|
| Carbon monoxide |
CO |
NO.1DL |
| Performance |
Measuring
Range
|
0.4 to 400 ppm |
Sampling Hours
|
0.5 to 24 hours |
Detecting Limit
|
0.2 ppm (24 hours) |
Color Change
|
Pale Yellow --->
Brown |
| Reaction
Principle |
Carbon Monoxide
reduces sodium palladosulfite to liberate
metallic palladium, which produces a brown stain.
CO + Na2Pd(SO3)2 ---> Pd + CO2 + SO2 + Na2SO3 |
| Coefficient
of Variation |
10% (for 10 to
200 ppm-hr) |
| Shelf
Life |
2 Years |
| Corrections
for temperature & humidity |
Unnecessary |
| Store the
tubes in the refrigerator to keep at 10oC (50oF) or below. |
| Possible
coexisting substances and their interferences |
Substance
|
Concentration
|
Interference |
Change
color by itself |
Nitrogen dioxide
|
5 ppm
|
Minus error
|
No discoloration
by itself |
Chlorine
|
-
|
No effect
|
No discoloration
by itself |
Hydrogen sulfide
|
-
|
Plus error
|
Discolors reddish
brown |
| Calibration
gas generation |
Permeation tube method |
TLV-TWA
|
TLV-STEL
|
Explosive
range |
| 25ppm |
- |
12.5 to 74% |
|
