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View Paper |
Session Topic: 6E, Pressure Session |
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Paper Title: Improvements in the Determination of Effective Area Through a Piston-Cylinder Pressure Calibration Chain |
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Date & Time: WEDNESDAY, August 7, 2002 |
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8:30 - 10:00am PARALLEL SESSIONS - SESSION 6 |
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Speaker: Michael Bair |
Email: mbair@dhinstruments.com |
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The determination of effective area is generally the greatest challenge in characterizing high performance piston gauges. Performing this task requires both specialized procedures and the availability of highly reliable standards. Since the mid-1980s, DH Instruments has maintained a pressure calibration chain made up of multiple, interconnected piston-cylinders both to assure the coherence of pressure measurements over a wide range and as a vehicle to maintain traceability to national measurement institutes (NMIs). In 2001, a three year calibration chain maintenance cycle was completed. The results reflect a number of changes made to the calibration chain that reduce the uncertainty in effective area over the covered range of less than 10 Pa to 500 MPa and thus reduce the uncertainty in DHI's accredited scope of pressure. This paper summarizes the principles of the calibration chain, examines the improvements made over the past few years, and illustrates the benefits realized. These benefits include lower uncertainty in effective area and pressure and better agreement in interlaboratory comparisons for various pressure calibration and standards laboratories around the world. |
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