Portable helium analysers

A relatively simple portable battery-operated ion pump with limited resolving power and sensitivity, which is suitable for the detection of 50 ppm or more He, has been described by Eremeev et al. (1973) and Yanitskii (1979). This instmment is capable of analysing up to 30 samples per hour but lacks the sensitivity required for near-surface samples. 

A portable He analyser capable of measuring 1% or more has been described by Sonnek et al. (1965). It performs pre-separation of He from other gases in the sample by means of a chromatographic column, with identification of the He constituent by the response of a thermistor at the end of the column. 

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