| 摘要 |
<p>A gas analyzer includes a gas sensor (100), a drive section (101) that pumps oxygen in first to third processing zones of the gas sensor, an operating section (102) that operates a pumping current flowing in a third electro-chemical pump cell into a gas value to be measured, a display output section (103) that displays a value operated by the operating section, or outputs the value as an electrical output to the external, and a heater drive section (104) that heats the gas sensor to a predetermined temperature. In the gas sensor a gas containing a gas component to be measured having bound oxygen is introduced into a first processing zone under a predetermined diffusion resistance, and an oxygen partial pressure in the atmosphere within the first processing zone is controlled to a predetermined oxygen partial pressure due to the pumping action of oxygen by the first electro-chemical pump cell in the first processing zone. The gas to be measured is then introduced into a second processing zone under a predetermined diffusion resistance, and oxygen is pumped out by the second electro-chemical pump cell in the second processing zone, so that the oxygen partial pressure in the atmosphere is controlled to a low oxygen partial pressure value that does not substantially influence the measurement of the amount of the gas component to be measured. Thereafter the gas to be measured is introduced into a third processing zone under a predetermined diffusion resistance, and the gas component to be measured in the atmosphere introduced from the second processing zone is reduced or decomposed in the third processing zone, and oxygen generated at that time is pumped out by a third electro-chemical pump cell. The pumping current flowing in the third electro-chemical pump cell is detected. The gas analyzer is calibrated using a plurality of samples of known gas component to be measured as a standard gas and pumping currents corresponding to the standard gas samples as a calibration curve. <IMAGE></p> |
