In response to the current global shortage of helium, the EffecTech presentation on alternative carrier gases for process gas analysers has been updated as a PDF for general release:
EffecTech – Alternative carrier gases for process gas analysers
The presentation looks at why helium is used as a carrier gas in natural gas chromatography, why the helium price has risen in 2019 and an overview of the pros and cons of the alternatives: nitrogen, argon and hydrogen.