Parkhurst & Oliff
Oxygen sensor with heater
 An oxygen sensor having a bar-shaped heater inserted in an elongate bore formed in a tubular body of solid electrolyte which has porous platinum electrodes on its inner and outer surfaces and which is supported by a housing such that its closed end portion is exposed to exhaust gas and such that the elongate bore is gas-tight with respect to the exhaust gas. The bar-shaped heater comprises a heating resistor having a positive temperature coefficient, a ceramic body carrying the heating resistor so as to embed the latter, and a pair of lead wires. The ceramic body has on its periphery a pair of terminal pads connected to the heating resistor. The ends of the lead wires are brazed to the terminal pads with a brazing material containing silver. The ceramic body further has a pair of equipotential members disposed outwardly of the pair of terminal pads to enclose at least portions of the peripheries of the pads which are opposite to each other. 
NGK Insulators, Ltd.
G
G01N
inventional
Takao Nobuhide
Murase Kato