ESTABLISHMENT THE TRACEABILITY OF NIS PISTON-CYLINDERS FOR THE 200 MPa RANGE OF HYDRAULIC PRESSURE
A. ELTAWIL, A. SALAMA
Abstract:
Pressure balances are excellent standards for measuring pressure with acceptable uncertainty and they are widely used at the primary pressure laboratories in the world. This study aims to establish the traceability of NIS piston cylinder assemblies for the 200 MPa hydraulic pressure range by calibrating them with the smallest uncertainty. All assemblies will be traceable to a transfer standard calibrated at BNM-LNE- France using di-ethylhexyl-sebacate as the pressure medium.
The consistency of all calibration data available will be investigated in order to draw conclusions regarding the realization of traceability in the 200 MPa range of hydraulic pressure by the cross float method. New values of the effective areas and the pressure distortion coefficients as will as the associated expanded uncertainties of NIS piston cylinder assemblies will be derived from the results of this study.
The present study also establishes a link to the latest trilateral intercomparison in the pressure range 40- 200 MPa between NIST-USA, AIST- Japan and NIS-Egypt.
Keywords:
Pressure balances, Uncertainty, Calibration, Traceability and Cross floating
