The Perkin-Elmer Corporation

Celia P Chang

Anthony F Poile

Thomas H Nash, Jr

A liquid chromatographic instrument includes specimen vessels in randomly designated locations. An automatic sampler sequentially samples specimens from selected vessels based on instructions from a set of command instruction lines. A detector module measures characteristics of each sampled specimen, and results for each test specimen relative to a standard specimen are computed. A command sequence program includes reading of a user inputed ordered list to effect a sequential selection of each location designation according to the ordered list, generation of a command instruction line corresponding to each sequential selection and containing a location designation and measurement instructions for each selected specimen, counting of the number of command instruction lines generated since a nearest prior calibration command instruction line, and in response to the counting number being equal to the calibration frequency, generation of a next calibration command instruction line containing the location designation and the measurement instructions for the standard specimen.

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New Canaan, CT, United States of America

Celia P Chang