INVESTIGATION OF CHARACTERISTICS OF 133 Pa CDG USING PRESSURE BALANCE

SamYong Woo, InMook Choi

Abstract

The purpose of this paper is to investigate the characteristics of precise low-pressure gauges such as Capacitance Diaphragm Gauge (CDG) devices in the range 133 Pa using a commercial gas-operated pressure balance. Generally the pressure balance is not adequate to calibrate such low pressure gauges as the minimum pressure to balance the tare weight corresponds to a pressure of several kilopascals. However using a variable bell-jar pressure method can overcome this difficulty. To realize this method effectively, we developed a new weight-handling device that makes it possible to add or remove weights easily. This apparatus is very useful to find the characteristics of such low-pressure gauges. Moreover, one of the greatest benefits of this method is the traceability to link directly to the gas pressure standard that is easily traceable to the national standard.

Keywords

CDG, pressure balance, characteristics

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PWC-2006-TC16-009u.pdf

DOI

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IMEKO TC

TC16 - Pressure and Vacuum Measurement

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