We present measurements on characterizing a new controlled-clearance piston gauge made by Ruska (Fluke Calibration) which has a 290 MPa maximum pressure and a nominal piston diameter of 3.27 mm. We tested the piston gauge to jacket pressures of over 80 % of the system pressure (but not exceeding 200 MPa). 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 16.0E-6 to 17.6E-6, and the agreement to the present NIST pressure scale is within the standard uncertainty.
Pub Type: Journals
controlled clearance piston gauge, effective area, Heydemann-Welch, piston gauge, pressure, primary pressure standard