Patent ID: 7438791
Filing Date: 2008-10-21
Classification: G01N

Abstract:
1. A concentration detector for detecting the concentration of a particular component included in a target gas and forming oxygen upon being decomposed, comprising: oxygen-forming means for forming oxygen by decomposing the particular component in an inputted gas; first output means for producing a first output value proportional to the oxygen concentration in the inputted gas before oxygen is formed by the oxygen-forming means; second output means for producing a second output value proportional to the oxygen concentration in the inputted gas after oxygen is formed by the oxygen-forming means; concentration calculation means for calculating the concentration of the particular component in the target gas based upon the first output value and the second output value by using a coefficient for bringing the output characteristics of the first output means into agreement with the output characteristics of the second output means when inputting the target gas as the inputted gas, and coefficient calculation means which calculates said coefficient based on the first output values and the second output values outputted when feeding at least a first gas and a second gas as the inputted gas, respectively, the first gas containing the particular component at a predetermined constant concentration and oxygen at a first concentration, the second gas containing the particular component at the same predetermined constant concentration as the first gas and oxygen at a second concentration different from the first concentration.