Flow Systems estimates flow measurement.  Uncertainty in accordance with the ISO GUM (Guide to Uncertainty in Measurement) and the ASME or ISO Standards for Critical Flow Venturis. Analyses include components arising from systematic effects such as calculation of fluid properties and instrument traceability; also taken into consideration are random effects observed during system operation.  Typical uncertainties range from +/-0.25% to +/-0.16% on mass flow.

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