Gas analyzer of the fluid modulation type
AssigneeHoriba, Ltd.
InventorsKozo Ishida, Hiroji Kohsaka
Life of this patent
Estimating the term…
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.
Claims10
In a gas analyzer of the fluid modulation type and including at least one cell, means for alternatively introducing a sample gas to be analyzed and a reference gas into said cell, detector means for analyzing a property of said sample gas, and means for alternately discharging said sample gas and said reference gas from said cell, the improvement comprising:
- a critical flow device located in said discharging means;
- and
- pump means, located in said discharging means, for operating said critical flow device under conditions of critical gas flow and for thereby maintaining said gas passing through said critical flow device and said cell at a constant flow rate.
Dependencies are inferred from the claim text.