Gas mixtures with the analytical method A-CGM

Gas mixtures with the analytical method A-CGM

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Gas mixtures with the analytical method A-CGM

Analytically calibrated traceable gas mixtures are defined A-CGM: the certified uncertainty and concentration are determined by comparison with the Center's traceable standard (G-CGM o CRM) or with the ones certified or produced by a Primary Metrology Institute.

The metrological traceability derives from the mixtures used in the calibration phase.

The reference standard for analytical calibration is ISO 6143. Instrumental calibration is performed for each mixture using the method of generalized least squares (GLS): three traceable gas mixtures are used (G-CGM, CRM or Primary Metrology Institutes mixtures).

The sample to calibrate may be supplied by the customer or produced by SIAD: the Center provides only the analytical calibration for the mixtures of the customer. If the mixture is produced by SIAD, the Special Gas mixtures stability guarantees apply.

In the hierarchy of the traceability of the Center's products, A-CGMs are metrologically inferior to the gravimetrically calibrated G-CGM mixtures: the calibration is made by comparison and not with a primary method; therefore also the certfied minimum uncertainty is higher.