Choice of Carrier Gas for the Gas Density Balance: Choix du Gaz Vecteur Pour la Balance a Densite de Gaz

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Abstract
As with other chromatographic detectors, the choice of carrier gas for the gas density balance is of the utmost importance if one wants to attain the maximum advantages that the detector has to offer. By using sulfur hexafluoride, which has a density five times greater than that of air, the sensitivity of the balance is more than tripled, making it comparable to thermal conductivity detectors. In addition to its function as a quantitative detector, a specific application of the balance when using SF6 as carrier gas is the determination of permanent gases. In a single operation it is possible to obtain the concentration in weight per cent of gases such as H2, O2, N2, CO, CO2, CH4, C2H4, C2H6, C2H2, etc. One can readily imagine the interest that this detector will hold for industrial control, where it can replace the Orsat apparatus.

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