Improvement of reliability in pressure measurements and international mutual recognition

Abstract

-Incorporation of industrial digital pressure gaugesto the national metrology systemReliable 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.

Long-term stability and zero drift of digital barometric pressure gauges

“…The figure shows that the pressure balance had quite good stability of better than 2 × 10 −6 for more than ten years. The final standard uncertainty (k = 1) of the effective area was estimated to be 6.5 × 10 −6 based on the measured results obtained from the absolute pressure measurements and other pressure balances [6].…”

“…In the Pressure and Vacuum Standards section, we provide calibration services for pressure measurement instruments to customers. Many pressure gauges of various pressure ranges are annually brought into our laboratory for calibration [6].…”

Simultaneous measurements of atmospheric pressure at multiple locations and their distribution via website

“…The group also have received many requests from inside and outside the institute regarding the calibration and management of atmospheric pressure gauges. To meet these kinds of requests, a remote calibration system for pressure gauges was developed previously [5,6]. The system can calibrate pressure gauges at the user site with high quality, however the calibration procedure for the remote calibration was relatively complicated and unsuitable for simple calibration and value confirmation.…”