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A 2D flow model is described for calculation of the effective area (A) of pressure-measuring pistoncylinder units (PCU) based on their dimensional properties. With the 2D model, the uncertainty contribution associated with PCU's axial nonsymmetry can be eliminated and the uncertainty of A can be reduced. The 2D model is applied to several primary PCUs operated in absolute and gauge pressure modes with different pressuretransmitting media. The benefit of the 2D model in dependence on PCU's geometrical perfectness is discussed.

2D flow model for calculating effective area of piston-cylinder units