Gas analyzer of the fluid modulation type
US4393304A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1981 |
| Grant date | Jul 12, 1983 |
| Priority date | — |
| Expiry date | Feb 18, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2001/244
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.