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Title: New-Design Dual-Balance Gravimetric Reference System With Ptbs New Hydrodynamic Test Field
Author: Rainer Engel, Ptb Braunschweig, Hans-Joachim Baade, Droege Baade
Source: Flomeko 2003
Year Published: 2003
Abstract: PTBs new Hydrodynamic Test Field, which represents a high-accuracy water flow calibration facility, will serve as the national primary standard for flow measurands: volumetric and mass flow rate, respectively, and total flow measurement, i.e. the quantity of fluid (volume or mass) passing a flowmeter. As most accuracy determining component parts, it comprises three different-size dual-balance gravimetric reference systems: 300 kg, 3 tons and 30 tons. This type of gravimetric references were realized as a combination of a strain gauge based and electromagnetic forcecompensation load cell based balance, each. Though each of these two weighing principles fulfils the individual accuracy requirements that have been derived from the total measurement uncertainty budget of the calibration facility as a whole, the electromagnetic force-compensation load cells reveal several advantages concerning linearity error, hysteresis error and sensitivity.

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