Patent ID: 9638609
Date: 2017-05-02
CPC Classifications: G01N,Y10T

Claim:
1. An apparatus for providing a sample gas to a gas analyzer, the apparatus comprising: a gas dosing portion; first, second and third flow lines diverging from the gas dosing part portion with each of the first, second and third flow lines extending to and connecting with the gas analyzer; a first pressure gauge configured to measure a pressure of a sample gas provided through the gas dosing portion; a first control valve configured to be opened and closed, the first control valve disposed in the first flow line; a second control valve configured to be opened and closed, the second control valve disposed in the second flow line; a third control valve configured to be opened and closed, the third control valve disposed in the third flow line; and a controller configured to: open the first control valve and close the second and third control valves when the pressure measured by the first pressure gauge is in a first pressure band, thereby allowing the sample gas to flow through the first flow line; open the second control valve and close the first and third control valves when the pressure measured by the first pressure gauge is in a second pressure band, thereby allowing the sample gas to flow through the second flow line; and open the third control valve and close the first and second control valves when the pressure measured by the first pressure gauge is in a third pressure band, thereby allowing the sample gas to flow through the third flow line.