Ống phát hiện nhanh khí Hydrogen sulphide
H2S Gastec 4LL (0.25-120 ppm)
Measuring Range | 0.25 to 2.5 ppm | 2.5 to 60 ppm | 60 to 120 ppm | |
Number of Pump Strokes | |
Correction Factor | |
Sampling Time | 1 minute per pump stroke |
Detecting Limit | 0.1 ppm (n=10) |
Colour Change | White → Brown |
Reaction Principle | H2S + Pb(CH3COO)2 → PbS + 2CH3COOH |
Coefficient of Variation | 5% (for 2.5 to 60 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 |
Nitrogen dioxide | 1/4 time |  | No |
Sulphur dioxide | 1/1 | + | No |
Mercaptans, Hydroren cyanide | | No | No |
Ozone | | Bleaching | No |
Calibration gas generation | Permeation tube method |
TLV-TWA | TLV-STEL | Explosive range |
1 ppm (2014) | 5 ppm (2014) | 4.0 to 44% |