Flow programmer for gas chromatography
US4760732A · kind A · utility
4Cited by
3References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1987 |
| Grant date | Aug 2, 1988 |
| Priority date | — |
| Expiry date | Jun 29, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N30/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flow programmer for gas chromatography of the type having a mass flow meter for controlling the flow rate of a gas chromatography carrier gas controllable at a selected carrier gas flow rate program by an electrical input to the mass flow meter and an electrical circuit for generating the electrical input. The improvement is that the electrical circuit for generating the electrical input is an analog electrical circuit which includes an operational amplifier having an electrical capacitor in the feedback loop of the operational amplifier to produce a selected voltage input program.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.