Abstract: Thermistors comprising transition metal such as iron, rare earth of the lanthanide series or yttrium, and oxygen exhibit sufficient independence to variation in oxygen partial pressure over a range of exhaust gas conditions of internal combustion engines as to make them particularly suitable for temperature compensation of oxygen sensors such as those derived from titania as well as temperature sensing in other oxygen varying environments.

Abstract: Thermistors comprising transition metal such as iron, rare earth of the lanthanide series or yttrium, and oxygen exhibit sufficient independence to variation in oxygen partial pressure over a range of exhaust gas conditions of internal combustion engines as to make them particularly suitable for temperature compensation of oxygen sensors such as those derived from titania as well as temperature sensing in other oxygen varying environments.

Abstract: Thermistors comprising transition metal such as iron, rare earth of the lanthanide series or yttrium, and oxygen exhibit sufficient independence to variation in oxygen partial pressure over a range of exhaust gas conditions of internal combustion engines as to make them particularly suitable for temperature compensation of oxygen sensors such as those derived from titania as well as temperature sensing in other oxygen varying environments.

Abstract: The present invention provides a sensor which is operative to sense the partial pressure of oxygen in the exhaust gases of combustion processes having air/fuel combustion mixture ratios in excess of the stoichiometric ratio. The sensor according to the present invention relies upon the direct and generally linear change in the logarithm of the resistance of cobalt monoxide ceramic material as a function of the partial pressure of oxygen in the environment of the sensor element at elevated temperatures for partial pressures of oxygen which coincide with the partial pressures of oxygen in the exhaust gases of fuel-lean combustion mixtures. The present invention provides a generally cylindrical cobalt monoxide ceramic sensor element, supported within a housing formed of a compatible ceramic material such as alumina, and arranged so that the change in the electrical resistance between the ends of the cylinder of the sensing element may be measured.

Abstract: The present invention provides a sensor which is operative to sense the partial pressure of oxygen in the exhaust gases of combustion processes having air/fuel combustion mixture ratios in excess of the stoichiometric ratio. The sensor according to the present invention relies upon the direct and generally linear change in the logarithm of the resistance of cobalt monoxide ceramic material as a function of the partial pressure of oxygen in the environment of the sensor element at elevated temperatures for partial pressures of oxygen which coincide with the partial pressures of oxygen in the exhaust gases of fuel-lean combustion mixtures. The present invention provides a generally cylindrical cobalt monoxide ceramic sensor element, supported within a housing formed of a compatible ceramic material such as alumina, and arranged so that the change in the electrical resistance between the ends of the cylinder of the sensing element may be measured.