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Research paper−212−Synthesiology - English edition Vol.4 No.4 pp.212-226(Mar. 2012) AIST has focused on the improvements of the performance of such digital pressure gauge, and has spent effort on the precise evaluation of its properties. As a result, the digital pressure gauge is now utilized in the upgrading of national standard and the standard provision, and the reliability of pressure measurement at the industrial sites improved greatly. On the other hand, the international mutual recognition of the measurement results is essential in modern international trade. AIST has contributed greatly in providing technical data for the mutual recognition of the national standard, such as conducting various international comparisons using the digital pressure gauge.In this paper, the R&D for the digital pressure gauge and its results in improving the reliability of pressure measurement at the industrial sites and the efforts on international mutual recognition to ensure free trade will be presented from the perspective of synthesiology based on the scenario. 2 Demand for the reliability of pressure measurement2.1 Demand from the Japanese industryTo conduct highly reliable pressure measurement using the pressure gauge at the industrial site, it is necessary to correctly calibrate the pressure gauge so it will be traceable to the national standard for pressure owned by AIST. On the other hand, the main standard for pressure owned by industry is the highly precise device called the pressure balance (deadweight pressure gauge)Note 1). While the pressure balance 1 IntroductionThe measurement of pressure is one of the essential measurements in people’s lives, society, industry, and science and technology. The pressure measurements for safety and security include the atmospheric measurement in meteorological observation, the altitude measurement for aircrafts, the blood pressure in medicine and health management, the measurement for high-pressure gas control, and the pressure measurement in the manufacturing process of food and pharmaceutical products. The pressure measurements for energy savings include the air conditioning of buildings and the adjustment of air pressure in tires and automobile engines. Moreover, various pressure measurements are conducted at various sites such as the maintenance of clean rooms where high air purity must be maintained for the manufacture of semiconductors and precision devices, the measurement and control of pressure in various processing, and the inspection of plants. In the field of science and technology, various R&Ds using pressure control and measurements are being done.For the pressure measurement conducted at the industrial sites, diverse pressure gauges are employed for wide pressure ranges, from low pressure of 1 Pa or less to high pressure of 1 GPa or more. Recently, the performance of the industrial pressure gauge increased significantly. Specifically, the performance increased in terms of expansion of measurement range, improvement in high resolution, improved short- and long-term stability, and improved stability in environment change and during transportation.- Incorporation of industrial digital pressure gauges to the national metrology system-Reliable pressure measurements provide the basis for all activities in society and industry, and every country shows considerable interest in them in international trade. Recently, characteristics of industrial digital pressure gauges and the short- and long-term stabilities as well as the stability under environment change and during transportation have been improved remarkably. AIST focused its attention on the technological advancement, and, after evaluating the characteristics of digital pressure gauges in detail, incorporated them to some phases in the metrology system, which are the upgrading of national pressure standards, the international comparisons of the standards and the domestic traceability system. Consequently, the reliability of pressure measurements in industrial fields has been secured through an efficient process, and the international mutual recognition has been promoted by carrying out many international comparisons. Improvement of reliability in pressure measurements and international mutual recognition Keywords : Pressure standard, digital pressure gauge, calibration, international comparison, metrological traceability [Translation from Synthesiology, Vol.4, No.4, p.209-221(2011)]Tokihiko Kobata*, Momoko Kojima and Hiroaki KajikawaNational Metrology Institute of Japan, AIST Tsukuba Central 3, 1-1-1 Umezono, Tsukuba 305-8563, Japan *E-mail : Original manuscript received July 4, 2011, Revisions received October 12, 2011, Accepted October 14, 2011

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