Use of a higher order Heydemann–Welch model to characterize a controlled clearance piston gauge
2012
Olson, Douglas A. | Gelany, Shaker A. | Eltawil, Alaaeldin A.
We present a new method for characterizing a controlled-clearance piston gauge as a primary pressure standard. This method requires operating the piston gauge to jacket pressures of over 80% of the system pressure. We present measurements on a hydraulic piston gauge with a 290MPa maximum pressure and a nominal piston diameter of 3.27mm. Measurements showed that the cylinder becomes stiffer as the jacket pressure increases, and that non-linear models of the Heydemann–Welch parameters improve the determination of the effective area. The relative standard uncertainty in the effective area of the piston gauge ranges from 16.0×10⁻⁶ to 17.6×10⁻⁶, and the agreement to the present NIST pressure scale is within the standard uncertainty.
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