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:
Apr. 17, 1979
Filed:
Jul. 06, 1978
Edmund E Buzza, Fullerton, CA (US);
John E Lillig, Diamond Bar, CA (US);
Beckman Instruments, Inc., Fullerton, CA (US);
Abstract
Apparatus for measuring CO.sub.2 in serum with a single pH sensor of the electrolyte flow-through type, the sensor including a gas-permeable membrane selectively passing CO.sub.2 into an electrolyte filled space adjacent a pH sensing electrode for reacting with the electrolyte to produce a pH change therein. The electrolyte space is connected by a conduit to an electrolyte reservoir for flowing fresh electrolyte to and through the electrolyte space prior to a sample measurement. A stainless steel metal electrode directly contacts the electrolyte of constant composition in the conduit upstream of the pH sensor to derive a reference potential thereat. The potential across the pH sensor and the stainless steel electrode is monitored, differentiated, and the maximum value of the differentiated signal measured to determine the CO.sub.2 concentration.