Typical Measurement Uncertainty in Gas Flow Measured by GFS2102 Gravimetric Flow Standard

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Typical Measurement Uncertainty in Gas Flow Measured by GFS2102 Gravimetric Flow Standard (76.28 KB)

The GFS2102 is a fully automated gravimetric flow standard designed to supply primary gas flow measurements from 0.2 to 200 mg/s. This system supports primary traceability at DH Instruments, Inc (DHI) and other laboratories by a method that is directly traceable to mass and time.

This technical note is provided to assist metrologists using GFS2102 in formulating an uncertainty analysis for their primary flow measurements. Unlike other uncertainty analysis technical notes published by DHI, this document does not provide a fixed product specification for various ranges of mass flow each defined in a specific table. Instead, it provides examples of uncertainties in the form of tables at different mass flow rates defining typical measurement uncertainty in an amount of mass depleted from the reference cylinder.