Flow regulation in gas chromatograph
US5545252A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1995 |
| Grant date | Aug 13, 1996 |
| Priority date | — |
| Expiry date | Mar 1, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/8881
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas chromatographic system includes a column and an injector for delivering into the column a test portion of flow. The injector has an exit passage for discharging a split portion of carrier flow. A flow controller for regulating the inlet flow rate includes a variable outlet restrictor for the split portion, a flow rate detector disposed to detect inlet flow rate, and a feedback flow controller to regulate the outlet restrictor to maintain the inlet flow rate substantially constant. Pressure at the inlet to the injector is regulated by detecting pressure at an outlet and providing feedback control to an inlet restrictor. An integral module for the gas components is used on each side of the injector. Calibration and correction for gas characteristics are provided in the feedback for a chromatographic system and for other flow controller regulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.