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:
Sep. 20, 2016
Filed:
Nov. 28, 2011
Neil Alexander Downie, Odiham, GB;
Neil Alexander Downie, Odiham, GB;
AIR PRODUCTS AND CHEMICALS, INC., Allentown, PA (US);
Abstract
There is provided a meter () for measuring the mass flow rate of a gas. The meter comprises a conduit () through which the gas flows in use. The conduit has a flow restriction orifice () through which choked flow occurs in use. The flow restriction orifice divides the conduit into an upstream portion () upstream of said orifice and a downstream portion () downstream of said orifice. The meter further comprises a sensor assembly (), the sensor assembly including a piezoelectric crystal oscillator () in said upstream portion such that said piezoelectric oscillator is in contact with said gas when the meter in use. The sensor assembly is arranged: to drive the piezoelectric crystal oscillator such that the piezoelectric crystal oscillator resonates at a resonant frequency; to measure said resonant frequency of said piezoelectric crystal oscillator; and to determine, from the resonant frequency, the mass flow rate through the orifice.