The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 25, 1994
Filed:
Jun. 18, 1991
Hideaki Yagi, Nagoya, JP;
Katsuhiko Horii, Nagoya, JP;
NGK Spark Plug Co., Ltd., Nagoya, JP;
Abstract
In a method of measuring humidity of an oxygen-containing gas by using an electrochemical cell, firstly an voltage is applied across the pair of the electrodes to obtain a characteristic curve between an intensity of the voltage and that of electrical current, the characteristic curve continuously originating from a first flat portion in which a first diffusion limit current generally remains constant within a predetermined voltage range, and ending up in a second flat portion in which a second diffusion limit current generally remains constant within a predetermined voltage range. Secondly each value of the first diffusion limit current and the second diffusion limit current is read out, and an arithmetic ratio of the first diffusion limit current to the second diffusion limit current is calculated to obtain the humidity of the gas.