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Vol. 136, Issue 1, January 2012, pp. 118-131




Pyramidal Traceability Hierarchy for Pressure Measurements and Calibrations at NIS- Egypt



National Institute for Standards (NIS), Giza, Egypt

Tel.: +002 010 0305 355, fax: ++202 33867451

E-mail: eltaweel38@yahoo.com


Received: 3 October 2012   /Accepted: 24 January 2012   /Published: 30 January 2012

Digital Sensors and Sensor Sysstems


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 study the propagation of uncertainty from primary standard piston cylinder assembly (PCA) up to 500 MPa. The hierarchy of pressure measurements at NIS is based on using large effective area PCA in defining the pressure of 1 MPa. Characterization of primary standard PCA is presented transferring the obtained results to other level pressure standard described. Uncertainty calculation method at each level was studied. Propagation of uncertainty from primary standards through national standards to digital pressure gauges, digital pressure calibrators, pressure sensors and pressure transducers were investigated. Study of the effect of each variable on the uncertainty calculation was discussed.


Keywords: Pressure balance, Calibration, Sensor, Uncertainty and traceability


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