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US 4,288,774 AGranted
Gas detector
AssigneeNgk Spark Plug Co., Ltd.
InventorsAkio Takami, Toshitaka Matsuura, Tsutomu Saito
Life of this patent
Estimating the term…
Abstract
A gas detector including a gas sensitive element that provides an electrical resistance which varies with the type of gas detected and lead wires for conducting the electrical signal from the gas sensitive element. A porcelain tube supports the gas sensitive element the lower part of which is positioned within a slot in the tube. Through holes in the tube receive the lead wires. A housing encloses the tube. Only the upper part of said gas sensitive element which is not positioned within the tube is provided with electrodes.
Claims4
A gas detector comprising:
- a gas sensitive element having an electrical resistance which varies with the type of gas with which said element is in contact, at least first and second electrodes coupled to said gas sensitive element, lead wires operatively coupled to said electrodes of said gas sensitive element, a ceramic insulator tube for supporting said gas sensitive element, said gas sensitive element having a lower part and an upper part, the lower part of said gas sensitive element being positioned in a slot in said tube and said tube having through holes provided therein for receiving said lead wires and a housing for enclosing said tube, said electrodes being provided only in the upper part of said gas sensitive element which is not positioned within said insulator tube.
Dependencies are inferred from the claim text.