Ống phát hiện nhanh khí Carbon monoxide
CO Gastec CO Gastec 1L (2.2~2000ppm)
Performance
Measuring Range | 2.5 to 25 ppm | 25 to 1000 ppm | 1000 to 2000 ppm | |
Number of Pump Strokes | |
Correction Factor | |
Sampling Time | 1 minute per pump stroke |
Detecting Limit | 1 ppm (n=10) |
Colour Change | Yellow → Blackish brown |
Reaction Principle | CO + Na2Pd(SO3)2 → Pd + CO2 + SO2+Na2SO3 |
Coefficient of Variation | 10% (for 25 to 300 ppm), 5% (for 300 to 1000 ppm) |
Shelf Life | 3 Years |
Corrections for temperature & humidity | Unnecessary |
Store the tubes at cool and dark place. |
Possible coexisting substances and their interferences (NOTE)
Substance | Concentration | Interference | Change colour by itself to |
Acetylene | 1/50 time | + | Dark brown |
Ethylene | 2000 ppm | No | Brown (whole layer) |
Hydrogen | 5000 ppm | + | Dark brown (whole layer)(1%) |
sulphur dioxide | 1/10 time | + | Dark brown |
Nitrogen dioxide | 40 ppm | + | Red (60 ppm) |
Carbon disulphide | 1/50 time | + | Dark brown |
Halogens | 1/5 time | + | Dark brown |
Mercaptans | 1/5 time | + | Dark brown |
Hydrogen sulphide | 1/5 time | + | Dark brown |
Calibration gas generation | High pressure gas cylinder method |
TLV-TWA | TLV-STEL | Explosive range |
25 ppm (2014) | - | 12.5 to 74% |