Airgas, Inc.

Scott Specialty Gases, Inc.

L'air Liquide,societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude

Stephen B Miller

Robert J Grasmeder

Michael A Benning

Nolan R Petrich

James S Wallis

Richard B Kowey

A method of generating a desired gas is provided. The method includes introducing a matrix comprising media containing a parent compound and an inert media into an effusion tube comprising a first zone and a second zone. The first zone includes a micro-porous metal tube, and a closed end. The second zone includes a non-porous metal tube, and an open end. Heating the effusion tube, produces a desired gas.

Method for generating formaldehyde monomer vapor

An apparatus for generating a desired gas is provided. The apparatus includes an effusion tube comprising a first zone and a second zone. The first zone includes walls of micro-porous metal tube, and a closed end. The second zone includes non-porous metal tube, and an open end. The two-zone effusion tube is fixtured inside of a larger cylindrical metal jacket with gas entry and exit ports at opposite ends of the jacket, which allows gas to flow over the exterior of the effusion tube. The effusion tube is configured to contain a matrix comprising media containing a parent compound and an inert media. A heating means for heating the effusion tube, thereby producing a desired gas which exits the open end of the metal jacket.

Apparatus for generating formaldehyde monomer vapor

A method of measuring the concentration of a component in a sample gas comprises the steps of: determining the flow rate at sonic velocity of a sample gas through a critical orifice; determining the flow rate at sonic velocity of a calibration gas through the critical orifice; comparing the flow rate of the sample gas with the flow rate of the calibration gas; formulating the calibration gas with an additional gas to adjust the flow rate of the calibration gas to approximately equal the flow rate of the sample gas through the critical orifice at sonic velocity, thereby creating a balanced calibration gas; calibrating the analyzer with the balanced calibration gas, wherein a concentration reading of the component from the analyzer is compared with a known concentration of the component in the balanced calibration gas; and measuring the concentration of the component of the sample gas using the analyzer.

Method and gas mixture for calibrating an analyzer

A system for continuously filling a plurality of cylinders with a precise concentration of a vaporized liquid component blended into a gas is disclosed wherein the concentration of the liquid component of the resultant final blended mixture is continuously analyzed, and immediately adjusted, during the filling process. Due to the constant analysis and adjustment, any error in the concentration of a component is typically realized before the concentration is outside an acceptable range. The inventive system allows for a large number of cylinders to be accurately and quickly filled with the compressed, final blended mixture.

Growing community of inventors

Doylestown, PA, United States of America

Stephen B Miller