Co sensor and method of measuring co concentration

Details Co sensor and method of measuring co concentration Co sensor and method of measuring co concentration

G - Physics

01

N

G01N 27/416 (2006.01) G01N 15/06 (2006.01) G01N 27/407 (2006.01) G01N 33/00 (2006.01)

Patent

CA 2366638

To provide a CO sensor and a CO-concentration measurement method which enable accurate measurement of CO concentration even when hydrogen concentration of a gas under measurement changes. Through application of a first predetermined voltage between first and second electrodes 7 and 8, hydrogen contained in a gas under measurement which has been introduced into a first measurement space 2 via a first diffusion-controlling section 1 is dissociated, decomposed, or reacted with another element in order to generate protons. The thus-generated protons are moved from the first electrode 7 to the second electrode 8 via a first proton- conductive layer or protons are moved from the second electrode 8 to the first electrode 7 via the first proton-conductive layer 5 (when the hydrogen concentration of the measurement gas is extremely low), so that the hydrogen concentration within the first measurement space 2 is controlled to a constant level. The gas under measurement having a controlled hydrogen concentration is introduced into a second measurement space 4 via a second diffusion-controlling section 3, and a second predetermined voltage is applied between third and fourth electrodes 9 and 10. The CO concentration of the gas under measurement is obtained on the basis of current (limiting current of protons) which flows between the third and fourth electrodes 9 and 10. Alternatively, the CO concentration of the gas under measurement is obtained from electromotive force generated between the third and fourth electrodes 9 and 10.

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