Effect of Dissolved Nitrogen Gas on the Density of Di-2-Ethylhexyl Sebacate: Working Fluid of the NIST Oil Ultrasonic Interferometer Manometer Pressure Standard

Hendricks, Jay H.; Ricker, Jacob R.; Chow, Justin; Olson, Douglas A.

doi:10.1080/19315775.2009.11721473

Cited by 7 publications

(6 citation statements)

References 10 publications

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“…The density of the fully-degassed DEHS was measured, then measured again after the DEHS sample had been exposed to a 10 kPa nitrogen environment for 90 h. A decrease of 3 × 10 −6 g cm −3 was observed. This result is consistent with previous measurements [18]. The relative uncertainty contributed by the gas exposure is estimated to be 3 × 10 −6 /0.913 957, i.e.…”

Section: Dehs Densitysupporting

confidence: 93%

“…The mercury UIM of the National Institute of Standards and Technology (NIST), covering a range from 1 Pa to 13 kPa, has an uncertainty of [0.003 2 + (3.2 × 10 −6 p Pa −1 ) 2 ] 1/2 Pa (k = 1) [7]. NIST also developed an oil UIM with a full-scale (FS) range of 140 Pa absolute pressure, and the uncertainty for pressures above 3 Pa is [0.0015 2 + (1.8 × 10 −5 p Pa −1 ) 2 ] 1/2 Pa (k = 1) [18]. In contrast to mercury manometers, oil manometers developed by NMIs have relatively large uncertainties, for example (0.002 + 3.2 × 10 −5 p Pa −1 ) Pa (k = 1) for pressures up to 1 kPa in [1] and (0.01 + 1 × 10 −4 p Pa −1 ) Pa (k = 1) for absolute pressures from 1 Pa to 1 kPa in [4], contributed mainly by the oil density.…”

Section: Introductionmentioning

confidence: 99%

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A new primary standard oil manometer for absolute pressure up to 10 kPa

Li¹,

Yang²,

Wang³

et al. 2015

Metrologia

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The National Institute of Metrology has developed a new oil manometer that covers the absolute pressure range from 100 Pa up to 10 kPa. The manometer is based on the ultrasonic measurement of transit time in oil columns, and a novel dual U-tube system has been designed to measure the speed of sound in real time as the pressure changes. The working fluid, di-2-ethylhexyl sebacate, was chosen for its sufficiently low vapor pressure and low sound attenuation. Each tube has a coating of Teflon to resist wetting by the oil. To obtain a uniform and stable temperature environment, the dual U-tube system is located inside a guard vacuum chamber that is wrapped with foam and aluminium foil. A vertical temperature difference of less than 20 mK, a horizontal temperature difference of less than 5 mK and a temperature stability better than 10 mK were achieved. The overall standard (k = 1) uncertainty of the oil manometer is estimated to be approximately (0.015 + 1.63 × 10 −5 p Pa −1 ) Pa for absolute pressure measurements.

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Section: Dehs Densitysupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

A new primary standard oil manometer for absolute pressure up to 10 kPa

Li¹,

Yang²,

Wang³

et al. 2015

Metrologia

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“…The laboratory standards at NIST used in this key comparison are two Ultrasonic Interferometer Manometers (UIMs), a mercury UIM with a full-scale range of 160 kPa and an oil UIM [5, 6] with a full-scale range of 140 Pa. The unique feature of these manometers is that changes in height of the liquid columns are determined by an ultrasonic technique.…”

Section: Laboratory Standardsmentioning

confidence: 99%

Final report on the key comparison CCM.P-K4.2012 in absolute pressure from 1 Pa to 10 kPa

Ricker

Hendricks²,

Böck

et al. 2017

Metrologia

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The report summarizes the Consultative Committee for Mass (CCM) key comparison CCM.P-K4.2012 for absolute pressure spanning the range of 1 Pa to 10 000 Pa. The comparison was carried out at six National Metrology Institutes (NMIs), including National Institute of Standards and Technology (NIST), Physikalisch-Technische Bundesanstalt (PTB), Czech Metrology Institute (CMI), National Metrology Institute of Japan (NMIJ), Centro Nacional de Metrología (CENAM), and DI Mendeleyev Institute for Metrology (VNIIM). The comparison was made via a calibrated transfer standard measured at each of the NMIs facilities using their laboratory standard during the period May 2012 to September 2013. The transfer package constructed for this comparison preformed as designed and provided a stable artifact to compare laboratory standards. Overall the participants were found to be statistically equivalent to the key comparison reference value.

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“…Against that, vacuum oils have low liquid densities -which increases the sensitivity of the pressure measurement by a factor of 10 or more, and a low vapour pressure -which makes the measurement of very small absolute pressures possible. But however, they suffer from high thermal volumetric expansion coefficients, gas absorption [2], [6] and possible long-term instability of their density. All these effects would be considered if the liquid density would be known, which means continuously measured.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Liquid Density Measurement for Liquid Column Manometry

Ehlers¹

2023

Proceedings of the 6th IMEKO TC16 Conference on Pressure and Vacuum Measurement

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At PTB, an interferometric liquid column manometer for the pressure measurement up to 2 kPa is under development. Its in-situ liquid density measurement is a new approach for those primary pressure standards and makes the use of low-density liquids -low in comparison with the density of mercury, a liquid often used in other standards -possible. Such liquids, here, vacuum oils, offer an excellent sensitivity in length changes against pressure. The liquid density measurement concept is presented, together with the uncertainty estimation.

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Effect of Dissolved Nitrogen Gas on the Density of Di-2-Ethylhexyl Sebacate: Working Fluid of the NIST Oil Ultrasonic Interferometer Manometer Pressure Standard

Cited by 7 publications

References 10 publications

A new primary standard oil manometer for absolute pressure up to 10 kPa

A new primary standard oil manometer for absolute pressure up to 10 kPa

Final report on the key comparison CCM.P-K4.2012 in absolute pressure from 1 Pa to 10 kPa

In-Situ Liquid Density Measurement for Liquid Column Manometry

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