UKAS accredited calibration for direct measurement LNG analysers
EffecTech has been awarded ISO 17025 accreditation from UKAS for the calibration of LNG analysers.
The calibration method uses reference liquid mixtures which are prepared cryogenically in a bespoke cryostat. This accredited method provides, for the first time, chemical traceability for instruments measuring LNG composition directly (without the need for a vapourisation stage).
Direct measurement LNG analysers do not need to vapourise the LNG prior to analysis and this is seen by many as a distinct advantage as it removes the issues caused by the vapourisation step. If the LNG sample is not fully vapourised instantaneously, there is a risk of fractionation and enrichment which can compromise the representativeness of the sample. Direct measurement therefore, in principle, can have lower uncertainties than the vapouriser/gas chromatograph (GC) combination method currently used.
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