ESTABLISHMENT OF THAILAND PRESSURE STANDARD FROM 1.5 kPa TO 500 Mpa

P. Wongthep, L. Sainoo

Abstract

This paper describes the method used to characterize the zero-pressure effective area (<i>A</i>₀) and pressure distortion coefficient (<i>λ</i>) of 200MPa-CCPG oil piston-cylinder unit (PCU) in order to realize the national pressure scale from 1.5 kPa to 500 MPa. The <i>A</i>₀ was determined by cross-floating method from a set of primary gas pressure standard, while the H-W method was used for calculating <i>λ</i>. A set of three oil PCUs was maintained as a primary pressure standard and used for scaling up and down pressure to determine <i>λ</i> for the other PCUs. The relative standard uncertainty of 200MPa-CCPG pressure standard is 3.0 · 10-5.

Keywords

zero-effective area; pressure distortion coefficient; primary standard

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IMEKO-TC16-2022-007.pdf

DOI

10.21014/tc16-2022.007

IMEKO TC

TC16 - Pressure and Vacuum Measurement

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