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:
Mar. 24, 1992
Filed:
Jun. 24, 1991
Peter Gerst, Karlsruhe, DE;
Wulf Springhart, Bollen, DE;
Abstract
The differential pressure measuring apparatus comprises a single chamber differential pressure sensor filled with a fluid and having two measuring capacitors whose capacitances vary in opposite senses in response to the differential pressure to be measured and in the same sense in response to the temperature said capacitances being transformed by means of associated capacitance measuring circuits into measurement signals which are supplied to a calculation circuit for calculating the temperature and the differential pressure. A temperature measuring means which comprises a temperature sensor mounted on the differential pressure sensor and a temperature measuring circuit connected to the temperature sensor measures directly the temperature of the single chamber differential pressure sensor. A comparison means compares the temperature calculated from the capacitances of the measuring capacitors with the measured temperature and delivers a signal indicating the occurrence of a failure when the difference between the compared temperatures exceeds a predetermined threshold. By this self-monitoring, perturbations and other causes of failure which would result in an erroneous measurement can be recognized and indicated with great safety.