Gas analyzer of the fluid modulation type

Details Gas analyzer of the fluid modulation type Gas analyzer of the fluid modulation type

1981-02-18

1983-07-12

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250344, 7386344, G01J 100

Patent

active

043933041

ABSTRACT:
A gas analyzer of the fluid modulation type includes at least one cell, structure for alternately introducing a sample gas to be analyzed and a reference gas into the cell, a detector for analyzing a property of the sample gas, and an arrangement for alternately discharging the sample gas and the reference gas from the cell. A critical flow device is located in the discharging arrangement. A pump is located in the discharging arrangement and has a capacity for operating the critical flow device under conditions of critical gas flow, thereby maintaining the gas passing through the critical flow device and the cell at a constant flow rate.

REFERENCES:
patent: 3699814 (1972-10-01), Kaufmann
patent: 3920993 (1975-11-01), Cederstrand et al.
patent: 4090078 (1978-05-01), Heim
patent: 4232223 (1980-11-01), Ohnishi et al.
patent: 4256964 (1981-03-01), Ishida et al.

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