Gas sensor

A gas sensor comprising:

• a main pumping means for pumping-processing oxygen contained in a measurement gas introduced from an external space via a gas-introducing port into a processing space formed and comparted by solid electrolytes contacting with said external space so that a partial pressure of oxygen in said processing space is controlled to have a predetermined value at which a predetermined gas component as a measurement objective is not decomposable;
• and
• a measuring pumping means for decomposing said measurement gas component contained in said measurement gas after being pumping-processed by said main pumping means, by means of catalytic action and/or electrolysis, and pumping-processing oxygen produced by said decomposition, wherein:
• said measurement gas component contained in said measurement gas is measured on the basis of a pumping current flowing through said measuring pumping means in accordance with said pumping process effected by said measuring pumping means, said gas sensor further comprising:
• a clogging-preventive section and a buffering space provided in series between said gas-introducing port and said processing space, wherein:
• said clogging-preventive section has its front opening which constitutes said gas-introducing port;
• and
• a diffusion rate-determining section for giving a predetermined diffusion resistance to said measurement gas is provided between said clogging-preventive section and said buffering space.

A gas sensor comprising:

• a main pumping means for pumping-processing oxygen contained in a measurement gas introduced from an external space via a gas-introducing port into a processing space formed and comparted by solid electrolytes contacting with said external space so that a partial pressure of oxygen in said processing space is controlled to have a predetermined value at which a predetermined gas component as a measurement objective is not decomposable;
• and
• an oxygen partial pressure-detecting means for decomposing said measurement gas component contained in said measurement gas after being pumping-processed by said main pumping means, by means of catalytic action, and generating an electromotive force corresponding to a difference between an amount of oxygen contained in a reference gas and an amount of oxygen produced by said decomposition, wherein:
• said measurement gas component contained in said measurement gas is measured on the basis of said electromotive force detected by said oxygen partial pressure-detecting means, said gas sensor further comprising:
• a clogging-preventive section and a buffering space provided in series between said gas-introducing port and a said processing space, wherein:
• said clogging-preventive section has its front opening which constitutes said gas-introducing port;
• and
• a diffusion rate-determining section for giving a predetermined diffusion resistance to said measurement gas is provided between said clogging-preventive section and said buffering space.