The Perkin-elmer Corporation

Perkinelmer Health Sciences, Inc.

Perkinelmer Las, Inc.

Paul E Schallis

Andrew Tipler

David Jerry Scott

Avinash Dalmia

Paul L St Cyr

E Joel McCorkle

James Botelho

John Vanderhoef

John McCaffrey

Michael J Rafa

Neal Green

Giuseppe Coppola

John V Hinshaw

Guiseppe Coppola

John Mccaffrey

Joel E Mccorkle

Michael Rafa

A gas chromatography system comprising a sample introduction device, an oven coupled to the sample introduction device and a detector coupled to the oven is disclosed. In certain examples, the oven may be configured to receive a chromatography column in a space in the oven. In some examples, the oven may be constructed and arranged to provide a substantially constant temperature to the space during an analysis stage of the gas chromatography system.

Methods and devices for circulating air

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.

Flow regulation in gas chromatograph

The bead source for the thermionic detector of a gas chromatograph is heated by the secondary winding of a transformer having a center-tapped primary and operating in the push-pull configuration. The voltage drop across the bead is compared with a preselected reference voltage and an error signal is generated. The error signal is used to control the output of a pulse width modulation control which supplies the transformer primary winding.

Method and apparatus for heating a thermionic detector source

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Ridgefield, CT, United States of America

Paul E Schallis