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. 02, 1998
Filed:
Sep. 16, 1997
Michael D Seltzer, Ridgecrest, CA (US);
Abstract
An isokinetic sampling system and method of operation assures the taking of more valid data over a long period by automated isokinetic sampling of flue gases in the stack for a stationary combustor. Sample air is extracted from the flue gases by a sampling probe having a sampling nozzle of a precise inner diameter, a thermocouple to measure the air temperature in the stack, and a pitot tube that gives readings representative of differential pressure across sampling nozzle. A separate transducer senses absolute pressure of the flue gases. Temperatures, absolute pressures and differential pressures of the flue gases are measured and representations of the temperatures, absolute pressures and differential pressures are fed to a micromanometer which feeds signals representative of these representations to a computer that generates responsive control signals for a mass flow controller. The mass flow controller throttles the flow of sample air through it to a correct magnitude to achieve isokinetic extraction of sample air under the existing stack conditions of temperature, pressure, and velocity at the point of extraction at the sample nozzle for the selected nozzle opening, or diameter. Stack conditions can vary over time and this automated isokinetic sampling system immediately adjusts the flow rate of mass flow controller so that isokinetic sampling continues uninterrupted and valid data can be generated by monitoring sensors.