Improvement of reliability in pressure measurements and international mutual recognition

Kobata, Tokihiko; Kojima, Motonaga; Kajikawa, Hiroaki

doi:10.5571/syntheng.4.212

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…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].…”

Section: Calibration Systemmentioning

confidence: 99%

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

2015

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Several digital pressure gauges at the National Metrology Institute of Japan (NMIJ) have been calibrated in the barometric pressure range on a regular basis for over ten years. The long-term stability of the zero and span readings for these pressure gauges was evaluated using their historical calibration data. The evaluation showed that most of the gauges have quite good long-term stabilities for the span readings, but some have large zero drifts with rates of about (10 to 50) Pa yr −1 . This paper discusses the causes for this drift: it can be explained by the combination of a small leak and gas emissions from the sensor volume, which are estimated from the typical drift rates. The zero drift of a particular gauge is well-approximated by an exponential function of time; the fitting function may give a good estimation of the zero drift in the future. This indicates that continuous characterization of a pressure gauge may enable appropriate correction of the indication and provide users more reliable data with less calibration work.

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Section: Calibration Systemmentioning

confidence: 99%

“…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].…”

Section: Introductionmentioning

confidence: 99%

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

2015

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Kojima¹,

Kobata²

2022

Meas. Sci. Technol.

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Atmospheric pressure measurements have been performed in many places and fields. In recent years, traceability and reliability of the measured values are required in various applications, or even a simple pressure measurement sometimes needs the verification with a certain uncertainty. To meet these requirements, we developed a system to distribute the real-time values of atmospheric pressure traceable to the national pressure standards via a website. The pressure values are measured at several locations in a target site and users can easily obtain measured and estimated values at their locations, even if they are in a different building or on a different floor from the measurement location. To estimate the atmospheric pressure at unmeasured locations within the target site, the estimation of the head correction at each location was carefully validated by the results of simultaneous measurements at multiple locations. Then the uncertainty of the estimated value is evaluated to be approximately 10 Pa under relatively mild weather.

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Improvement of reliability in pressure measurements and international mutual recognition

Cited by 2 publications

References 12 publications

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

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

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

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