Gas-Chromatography (GC) is one of the most important techniques used to analyze compounds that can be transformed to a gaseous phase. A precise and stable gas flow control is essential at different points within a GC system, in order to achieve high resolution peaks.

The Axetris MFC provides excellent control of gas flows resulting in sharp peaks and high resolution of chromatograms. Multiple calibrations allow the control of Helium, Hydrogen or Nitrogen. Due to the high turn down ratio of 1000:1 and more, a broad range of flows can be controlled. Because of its ultra-compact size, the MFC 2022 module is the best choice if you have limited space and your instrument offers a common enclosure already. It can also be recommended for portable applications thanks to its low power consumption and weight. Besides carrier gas control, Axetris MFCs are also used on the inlet side of gas chromatographs, for example for thermal desorption. On the detector side of gas chromatographs, in particular TCD (Thermal Conductivity Detector) and MSD (Mass Selective Detector), Axetris customers benefit from excellent repeatability and leading low flow capability of the Axetris mass flow controllers.

The Importance of Precise Flow Control for Each Process Step

A typical GC setup consists of a sampler, a GC column, and a detector. Gas flow control within each of these elements faces unique challenges.

Excellent repeatability is critical for the sampling system. A high turn down ratio of the gas flow provides additional flexibility. In carrier gas control, repeatability and a fast response time provide good peak resolution. With the option for multi-gas in the mass flow controller, different carrier gases can be used. At the detector, high accuracy of flux measurement is critical for measurement performance. In addition, high repeatability reduces deviations at the detector.