Method and apparatus for measuring the O.sub.2 content of a gas
 A method and apparatus for obtaining an electrical signal which is a function of the 0.sub.2 content of the exhaust gas of an internal combustion engine. Two resistors (1 and 3) are exposed to the exhaust gas of an internal combustion engine. Both resistors (1 and 3) have a resistance which varies as a function of the temperature of the exhaust gas to which it is exposed. However, the resistance of one of the resistors (1) also varies as a function of the oxygen content in the exhaust gas. Therefore, by applying a voltage to the resistors an electrical signal can be obtained which is a function of the O.sub.2 content of the exhaust gas, with the temperature effect of the exhaust gas on the network output being minimized or eliminated. The resistors (1 and 3) that form the sensing elements (10) are connected in series to other resistors to form a first and second resistor network which is connected together in parallel circuit relationship. 
Bendix Autolite Corporation
G Y F
G01N Y10T F02D
inventional additional inventional
Raymond J. Walter F.
Eifler Datwyler, Jr.