Pneumatic chromatograph

Details Pneumatic chromatograph Pneumatic chromatograph

1975-02-14

1977-02-08

Queisser, Richard C.

Measuring and testing

Gas analysis

Gas chromatography

13762414, G01N 3108

Patent

active

040066240

ABSTRACT:
An all-pneumatic process chromatograph having a pneumatically-actuated sample-injection valve, an orifice connected in the column output line to develop a pressure signal corresponding to fluid density, a pneumatic amplifier for strengthening the pressure signal, and pneumatically-operated control means for developing a periodic sample-valve actuating signal and for selecting a particular peak of interest at a controllable time following injection of the sample. The pneumatic control means includes means automatically operable to adjust the time of peak selection in response to changes in actual peak elution time. The temperature-sensitive elements of the apparatus are contained in a chamber which is heated by a source of steam heat, with the rate of heat transfer being regulated pneumatically to maintain a relatively constant temperature within the chamber.

REFERENCES:
patent: 2951361 (1960-09-01), Fuller
patent: 3057184 (1962-10-01), Spracklen
patent: 3086386 (1963-04-01), Kapff
patent: 3779069 (1973-12-01), Berthold
patent: 3824838 (1974-07-01), Ohtsu et al.

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