I have new inquiry. First inquiry, The customer would like to measure Methane gas (Biogas) in pipe close system at the top which customer tell me “Biogas is a gas that have the main component are 2 types is Methane(CH4) and Carbon Dioxide (CO2) in a ratio of about 50-75% and 25-50%,respectively and mixed in with other gases a small amount of about 1-2% such as Nitrogen(N2), Hydrogen(H2), Hydrogen Sulfide and Moisture