| Patent Number |
Title Of Patent |
Date Issued |
| 4023930 |
Method and apparatus for determining the concentration of a gas or gases in a gas mixture by sen |
May 17, 1977 |
| The concentration of gas is determined by monitoring the coloration of a reagent test paper, or the like, whose color changes progressively or otherwise in response to continued exposure to such gas. The concentration is determined by determining the length of time which the reagent test |
| 4004146 |
Infrared gas analyzing photometer with chopper designed to avoid radiation waste |
January 18, 1977 |
| An infrared gas analyzer is provided with a first path for reference radiation and a second path for measuring radiation. A source emits infrared radiation into the first and second paths. A detector arrangement is positioned at the ends of the paths for sensing the intensity of refe |
| 3950644 |
Non-dispensive infrared gas analyzer |
April 13, 1976 |
| A non-dispersive infrared analyzer, particularly for determining the concentration of a gas in a gas mixture, including a source of infrared radiation, means for modulating the radiation beam, a test chamber in the path of the modulated beams and containing the gas to be analyzed; an |
| 3949231 |
Infrared radiating unit for infrared analyzers |
April 6, 1976 |
| A cylindrically shaped coil of resistance wire constitutes a source of infrared radiation which is located within a reflector comprised of a curved reflector section having a reflecting surface shaped to resemble an axially bisected rotationally symmetrical paraboloid, and a cylindrical |
