Sample injection timer for chromatographic apparatus

Details Sample injection timer for chromatographic apparatus Sample injection timer for chromatographic apparatus

1986-02-25

1987-10-27

Levy, Stewart J.

Measuring and testing

Sampler, sample handling, etc.

Analyzer supplier

7386301, G01N 3012

Patent

active

047021152

ABSTRACT:
A method and apparatus for detecting the injection of a solvent borne sample into the injector port of a chromatograph having a carrier gas flow path for pressurizing the port. The gas pressure in a region adjacent the injector port is monitored. When vaporization of the solvent causes the carrier gas pressure to rise above the steady state value by a threshold amount, a control signal is generated which serves as an accurate time reference for the moment of sample injection into the injector port. The carrier gas pressure is monitored by time averaging the instantaneous carrier gas pressure and differentially sensing the instantaneous carrier gas pressure and the time averaged instantaneous carrier gas pressure. The time averaging is preferably done by flow restricting the carrier gas and accumulating the flow restricted carrier gas in a chamber.

REFERENCES:
patent: 3630088 (1971-12-01), Sawyer et al.
patent: 3649204 (1972-03-01), Farr
patent: 3668834 (1972-06-01), Deans
patent: 3800593 (1974-04-01), Bradley
patent: 3940994 (1976-03-01), Klee et al.
patent: 4035168 (1977-07-01), Jennings
patent: 4347215 (1982-08-01), Sisti et al.
patent: 4414857 (1983-11-01), Brazhnikov et al.
"Automatic Vapor Sampling for Gas Chromatographic Analysis"; Analytical Chemistry, vol. 38, No. 8, Jul. 1966, pp. 1097-1098; G. Szekely et al.

Affiliated with

Also associated with

Rating

Sample injection timer for chromatographic apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sample injection timer for chromatographic apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sample injection timer for chromatographic apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1265645