𝔖 Bobbio Scriptorium
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CGC using a programmable electronic pressure controller

✍ Scribed by Hermann, Bruce W. ;Freed, Lesley M. ;Thompson, Michael Q. ;Phillips, R. John ;Klein, Ken J. ;Snyder, W. Dale

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
472 KB
Volume
13
Category
Article
ISSN
0935-6304

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✦ Synopsis

Abstract

Capillary gas chromatographic separations were performed with an electronic pressure control system developed to provide precise closed‐loop control of inlet pressure through the use of a solid state micro‐machined pressure sensor and electronically controlled proportional valve. The closed‐loop control of the electronic system provided better precision than the open‐loop control achieved by manual pressure regulation. Closed‐loop control can perform pressure programming, which can be combined with temperature programming to optimize separations. The pressure sensor monitors the integrity of the flow system and singals the controller to reduce flow in the presence of a sudden loss of system pressure.

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## Abstract HP 5890 Series II Gas Chromatographs are equipped with prototype hardware enabling electronic pressure programming of all detector and carrier gases. A method of using electronic pressure control (EPC) to optimize detector performance (sensitivity, selectivity, and baseline stability) i