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Title: A Novel Concept Of A High Accuracy Calibration Rig
Author: A. Pfau, H. Hafelfinger, J. Honegger, J. Gfeller
Source: 2009 International Symposium on Fluid Flow Measurement
Year Published: 2009
Abstract: Within a project period of one and a half years a substantially improved calibration facility at Endress+Hauser Flowtecs production centre in Reinach, Switzerland, was developed, built and commissioned. The first run with a meter under test happened in March 2007. In August 2008, the facility was accredited according to ISO/IEC 17025 to within 0.015% best uncertainty covering a flow rate of 0.7t/h - 432t/h, with gravimetric reference (79kg/h - 1.2t/h, 0.021% with volumetric reference). The stated objective was to provide a facility capable of operating to a very high level of accuracy, to be employed to calibrate customers Promass 83/84F Coriolis mass flow meters fully traceable, with improved specification of 0.05%. To achieve this, a number of elements of two existing calibration rigs had to be analyzed and improved. To guarantee this low level of uncertainty of the facility, frequent calibrations-, and if necessary adjustment of the system to minimal deviation as compared to the reference (weighing system) are implemented. For that purpose, certified weights of the OIML class F2 are permanently located at the sides of the weighing tanks. Based on this concept, the calibration can be carried out fully automatically every two weeks. In this presentation the key elements of this facility, the achieved performance and the traceability to the national standard will be outlined.

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