Liquefied gas mixtures, or ‘liquid mixtures,’ are often used for calibrations where the application demands calibration with a ‘heavy’ or longer-chain hydrocarbon (see Demystifying hydrocarbon gas mixtures in non-refillable cylinders). Liquid mixtures have the advantage of closely matching the product being analysed (e.g. stream gas), while also offering increased efficiency by allowing an increased number of calibrations with the same cylinder, when compared to a gaseous mixture.
While liquid mixtures do have significant advantages, there are some disadvantages to consider. As is described in our previous blog on Issues with liquefied calibration gases, there are rules that can be followed to mitigate the issues. One of those being choice of cylinder type.