Patent Number: 6,254,828

Title: Fluid cell substance analysis and calibration methods

Abstract: Gases flow to individual gas analysis cells. The cells are sequentially aligned with an infrared detector, which senses the composition and quantities of the gas components. Each elongated cell is tapered inward toward the center from cell windows at the ends. Volume is reduced from a conventional cell, while permitting maximum interaction of gas with the light beam. Reduced volume and angulation of the cell inlets provide rapid purgings of the cell, providing shorter cycles between detections. For coal and other high molecular weight samples, from 50% to 100% oxygen is introduced to the tubes. Cells are suspended from adjustable holders on a frame which is spaced from a table. The table is moved by a linear motor and a fixed platen. Sides of the table are shielded to prevent electromagnetic and magnetic motor interference with detected results. The entire table, cells, mounting plate and linear motor are mounted in a housing with aligned holes for the analysis energy source and detector. The gas cells are calibrated for carbon dioxide and water vapor with a mass flow controlled oxidized fuel gas from a single analyzed source of such gas, oxygen and inert gas. Other calibration gases may be included, generated or added in the calibration gas stream.

Inventors: LaCount; Robert B. (Waynesburg, PA)


International Classification: G01N 31/12 (20060101); G01N 21/31 (20060101); G01N 21/35 (20060101); G01N 33/22 (20060101); G01N 031/12 (); G01N 021/05 ()

Expiration Date: 07/03/2018