一氧化碳氣體檢測管1La Carbon monoxide
Carbonmonoxide LA
CO
| 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 pumpstroke | |||
Detecting Limit | 2 ppm (n=3) | |||
Color Change | Yellow → Blackishbrown | |||
Reaction Principle | CO +Na2Pd(SO3)2 → Pd + CO2 + SO2+Na2SO3 | |||
| Coefficient ofVariation | 10% (for25 to 100 ppm), 5% (for 100 to 500 ppm) | |||
| ShelfLife | 3Years | |||
| Correctionsfor temperature & humidity | Temperature correction is necessary | |||
| Store the tubes at cool and darkplace. | ||||
| Possible coexisting substances and theirinterferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Acetylene | 1/50 time | Plus error | Discolors darkbrown |
Ethylene | 2000 ppm | No effect | Discolors whole layerto brown |
Hydrogen | 5000 ppm | Plus error | Dark brown (wholelayer)(1%) |
Sulfurdioxide | 1/10 time | Plus error | Discolors blackishbrown |
Nitrogendioxide | 40 ppm | Plus error | 60 ppmNO2 gives redstain |
Carbondisulfide | 1/50 time | Plus error | Discolors darkbrown |
Halogens | 1/5 time | Plus error | Discolors darkbrown |
Mercaptans | 1/5 time | Plus error | Discolors darkbrown |
Hydrogensulfide | 1/5 time | Plus error | Discolors darkbrown |
| Calibration gasgeneration | Diffusion tubemethod | |
| TLV-TWA | TLV-STEL | Explosive range |
| 25 ppm | - | 12.5 to 74% |
