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GC/Computer Interfacing Using LabVIEW

This document outlines the integration of gas chromatography (GC) with computer systems using LabVIEW, a graphical programming language. It details the creation of a data acquisition program designed to display, report, and integrate peak data from a GC through an analog-to-digital converter. Key components include front panel and block diagrams, as well as sub-VIs for peak detection, solvent filtering, and data formatting. The program aims to collect and process peak data efficiently while identifying future goals such as improving integration procedures and exporting data files for report generation.

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GC/Computer Interfacing Using LabVIEW

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  1. GC/Computer Interfacing Using LabVIEW Courtney Arnott April 22, 2002 CHEM 250

  2. Dedication • Bryan Alphin Bente (SBC Class of 1969) • Rachel Snider

  3. LabVIEW • Graphical programming language (G) • Data acquisition • Instrument control • VI • Front panel • Block diagram 1. “LabVIEW User Manual,” p.1-1 and 1-2. National Instruments, 1992.

  4. Goals • Interface GC with computer • Create data acquisition program • Display, report, integrate peaks

  5. A-to-D Converter • Converts voltage signal to logic state • Two types • Staircase • Successive-approximation 2. Skoog, Holler, and Nieman. Principles of Instrumental Analysis, Fifth Edition. Saunders College Publishing: Philadelphia, 1998.

  6. Integrating GC and Computer • Sends voltage signal from GC to A-D converter • Max signal = 1V

  7. Testing the Connection • Used wires and voltmeter • Ran with computer interface and plotter simultaneously • Adjusted connection to achieve + voltage

  8. Front Panel

  9. Block Diagram

  10. Sub-VIs • Separate VI used for one particular function • Make main program more organized • Can be used in other programs • Three Sub-VIs • Peak • Limit • Table

  11. Sub-VI: Peak • Y-values, Peak Min (set by user) • Finds peak amplitudes and locations

  12. Sub-VI: Limit • Filters out solvent front • All y values over 0.65 are discarded from array • Corresponding x values removed

  13. Sub-VI: Table • Integrates peaks • Formats locations, amplitudes, and areas into table

  14. Program Results • Collects data and finds peak • Programmed to ignore solvent front • Displays peaks in table format • User information inputs

  15. Future Program Goals • Fix integrate procedure • Export data to file • Publish reports

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