| Carbon monoxide | CO | NO.1La |
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| Performance |
|
Measuring Range |
8 to 12.5 ppm |
12.5 to 25 ppm |
25 to 500 ppm |
500 to 1000ppm |
|
Number of Pump Strokes |
3 |
2 |
1 |
1/2 |
|
Correction Factor |
1/3 |
1/2 |
1 |
2 |
|
Sampling Time |
2 minutes per pump stroke |
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Detecting Limit |
2 ppm (n=3) |
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Color Change |
Yellow |
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Reaction Principle |
CO +Na2Pd(SO3)2 |
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| Coefficient of Variation | 10% (for 25 to 100 ppm), 5% (for 100 to 500 ppm) | |||
| 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 | (NOTE) |
|
Substance |
Concentration |
Interference |
Change color by itself |
|
Acetylene |
1/50 time |
Plus error |
Discolors dark brown |
|
Ethylene |
2000 ppm |
No effect |
Discolors whole layer to brown |
|
Hydrogen |
5000 ppm |
Plus error |
Dark brown (whole layer)(1%) |
|
Sulfur dioxide |
1/10 time |
Plus error |
Discolors blackish brown |
|
Nitrogen dioxide |
40 ppm |
Plus error |
60 ppm NO2 gives red stain |
|
Carbon disulfide |
1/50 time |
Plus error |
Discolors dark brown |
|
Halogens |
1/5 time |
Plus error |
Discolors dark brown |
|
Mercaptans |
1/5 time |
Plus error |
Discolors dark brown |
|
Hydrogen sulfide |
1/5 time |
Plus error |
Discolors dark brown |
| Calibration gas generation | High pressure gas cylinder method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 25ppm | - | 12.5 to 74% |
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| Copyright(c) 2001 GASTEC CORPORATION. All rights reserved. |
Blackish brown