Swinton Technology has partnered with i-Vigilant Technologies to provide GCAS. A patented condition based monitoring software application designed to report on the accuracy and uncertainty of your gas chromatograph.

GCAS offers the most comprehensive solution in the industry by removing the need for conventional GC maintenance. All GCAS needs is a healthy ‘footprint’ of the chromatograph, along with access to ongoing calibration data via a Modbus data link. This routine data is then used to effectively monitor current and historic performance.

Once the initial footprint is set up as a reference, the data produced by GCAS comes directly from the Modbus data received from the gas chromatograph. No manual data entry means there is no human error in reporting and monitoring the gas chromatographs performance.

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The Benefits

  • Provides real time assurance that the GC is operating correctly
  • Analyses historical data to identify changes and predict future failures
  • Reduces the need for conventional maintenance and unnecessary costs
  • Determines dynamic GC uncertainty for quantification of GC performance
  • Validates that the pressure let down system provides a representative sample
  • Creates a fully auditable database of GC performance
  • Helps to support and increase a technicians competence level

Condition Based Monitoring

GCAS captures Response Factor and Retention Time data for each routine calbration gas analysis. This data is presented in clear graphical and tabular formats, giving operators the ability to detect errors as soon as they occur, simply by monitoring GCAS correlation tools.

Where errors are identified GCAS gives clear advisory information as to the potential cause, simplifying the troubleshooting process.

Undoubtedly the performance of your chromatograph will change over time, and different components can be adversely affected. GCAS plots the response factor and retention time deviation trends for each individual gas component, allowing any deviation of individual components to be quickly identified and dealt with.

GCAS confirms the correlation between each gas component and identifies any gradual shifts in gas chromatogram timing, giving you a clear insight into repeatability and reproducibility changes that occur over the operating life of the chromatograph.

The GCAS Dashboard

Instead of carrying out costly and time consuming preventative maintenance checks, operators can use the GCAS dashboard to monitor the health of all on-site GCs. The GCAS dashboard provides a clear health indication for all connected gas chromatographs.

Only when an error is detected should it be necessary to investigate any performance issues, using the GCAS condition based monitoring tools to help rectify the issue.

Uncertainty Calculations

One feature that sets GCAS apart is its unique and patent protected method of calculating uncertainty for the gas chromatograph. Until recently this uncertainty could only be achieved using laboratory analysis, with the subsequent results being applied to gas measurement until the next analysis could be performed. 

GCAS compares your calibration gas analysis data to a healthy footprint in order to determine uncertainty values for each gas component. These uncertainties are derived from repeatability and patent protected reproducibility calculations, ultimately allowing GCAS to calculate an overall uncertainty for your chromatograph.

For fiscal gas applications GCAS can apply these gas chromatograph values to the ISO6976 standard, to routinely calculate up to date and representative uncertainties for Calorific Value, Wobbe Index, Molecular Weight, Relative and Standard Density.

Metering Supervisory Integration

GCAS gives you a comprehensive and up to date insight into the performance of your gas chromatograph. At Swinton Tehcnology we offer access to this information through our TruST Metering Supervisory Computer. 

TruST already includes a range of tailored benefits, such as integration with all major flow computer types and fully embedded Prognosis DP meter diagnostics. Now TruST can also provide integrated GCAS features, including the GCAS dashboard status.

Any issues identified by GCAS will be displayed in TruST with an appropriate alarm status. Uncertainty values applied to the ISO6976 calculation can also be shown on TruST mimics.

"GCAS and i-Vigilant support has helped improve the knowledge & confidence of the offshore metering technicians when maintaining the GC."

- Gary Miller, Lead Metering Engineer, BG Group

"GCAS has helped reduce troubleshooting time. Great value for money and it gives the metering team confidence on a weekly basis that the GCs are performing as they should be"

- Marc Bayham, Metering Engineer, Emerson METCO

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Contact Your Local Swinton Technology Office

Our customer service team will be happy to discuss GCAS with you in more detail.