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Title: Uncertainty Budget Of And First Experiences With The New Multiparameter R+D Gas Calibration Rig
Author: A. Pfau, A. Gruen, m. Hull, O. Popp
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: Recently Endress+Hauser Flowtec AG at Reinach, Switzerland, inaugurated a new testing facility for experimental gas flow investigations. The newly developed R+D calibration rig covers process operation points ranging from ambient temperature to 100 C (212 F) and pressures from vacuum (0.5 bar a, 7.25 psi a) to 10 bar a (145 psi a). A special feature is the capability to run air, CO2 or other non-explosive, inert gases, e.g. argon. The line sizes offered range from to 6. The reference meters in use are PD-meters and turbines. The rig is driven by a 160 kW radial blower. It is connected to the quality management system according to ISO17025 but not currently accredited. This paper describes the concept of the rig in detail. It presents first experiences gained during the commissioning phase concerning the control system of a closed loop system. It proves the importance of measuring and controlling the flow distribution in the piping (main flow and bypass flow) in order to ensure a safe operation of the radial blower. Finally, the measurement uncertainty budget is presented covering a set of relevant uncertainty contributors, e.g. gas composition, volume flow, density determination, and flow profile

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