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:
Nov. 01, 1994
Filed:
Jun. 18, 1993
Martin Lenfers, Vaihingen/Enz, DE;
Johann Riegel, Moeglingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The reaction heat sensor and control and analysis devices for measuring the concentration of reactive species in a medium includes a temperature dependent measuring resistor and a reference resistor connected in series. Both resistors, which are supplied with a constant alternating current by a constant current generator, are heated with a heating resistor. By analysis of the voltage drop at the reference resistor the heating resistor is regulated so that the temperature of the reference resistor and thus its reference resistance is kept constant. Thus it is guaranteed by control circuitry that the temperature of the measuring resistance is kept constant when no heat is generated by reaction on exposure to the medium. If a reaction occurs at the measuring resistor, the temperature of the measuring resistance changes and with it the voltage drop across the measuring resistor, which is analyzed and is a direct measure of the heat produced by the reaction.