The reduction of uncertainties for absolute piston gauge pressure measurements in the atmospheric pressure range

Welch, B. E.; Edsinger, R. E.; Bean, Vern E.; Ehrlich, Charles D.

doi:10.6028/jres.094.033

Cited by 13 publications

(10 citation statements)

References 6 publications

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“…NIST2 was a commercially available pistoncylinder which had been modified in several ways [9]. The entire mechanism for the top and bottom stops had been replaced with parts made from Kel-F to ease cleaning and eliminate a source of dirt.…”

Section: National Institute Of Standards and Technologymentioning

confidence: 99%

Comparison of pressure standards in the range 10 kPa to 140 kPa

et al. 1998

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This report summarizes the results obtained by twelve laboratories in a comparison of pressure measurement standards in the range 10 kPa to 140 kPa, carried out under the auspices of the Consultative Committee for Mass and Related Quantities. Measurements were taken in the absolute mode and, by some participants, in the gauge mode. Good repeatability and, until near the end, reproducibility were observed in the transfer standard. The results displayed significant differences between some of the participants beyond those expected from their claimed uncertainties.

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Section: National Institute Of Standards and Technologymentioning

confidence: 99%

Comparison of pressure standards in the range 10 kPa to 140 kPa

et al. 1998

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“…Thus the use of simple piston gauges, which are portable, easier to operate, and capable of measuring higher pressures, is becoming important for transferring the unit of pressure from the manometer with only minimal loss in accuracy [5-71. As an alternative to the manometer, primary controlled clearance piston gauges can also be used to calibrate simple piston gauges to a few MPa, although with approximately twice the uncertainty [SI. With proper precautions concerning certain observed gas species and operational mode effects [9], it is possible 0957-0233/93/030249+W $07.50 @ 1993 IOP Publishing Ltd to use piston gauges as primary instruments, with acceptable uncertainties, by using geometrical measurements. A detailed study has been carried out to compare four simple piston gauges, denoted NIST 4, NIST 5, NIST 8 and NIST 9.…”

Section: Introductionmentioning

confidence: 99%

Intercomparison of the effective areas of a pneumatic piston gauge determined by different techniques

Jain¹,

Ehrlich²,

Houck³

et al. 1993

Meas. Sci. Technol.

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A variety of primary measurement techniques is now available for the measurement of pressure to 1 MPa and above. To ascertain the systematic uncertainty, if any, which exists in the measured pressure using the individual techniques, it is best to perform direct intercomparisons of primary instruments, However, when direct intercomparison is not possible, the next best alternative is to use a highly stable, reproducible transfer artifact such as a simple piston gauge. Such intercomparisons are described here, utilizing a piston gauge calibrated by a mercury manometer (with 0.1 MPa full-scale pressure), four large diameter 'dimensional' piston gauges from two different manufacturen (all with 1 MPa fullscale pressure), and a controlled clearance piston gauge (with 7 MPa full-scale pressure). The area ratio derived from dimensional measuremenk on two of the large diameter gauges, when compared with the ratio obtained from measuremenk traceable to a manometer, agrees within 1 part per million (ppm). For one of the large diameter piston gauges, t h e area value obtained from the manometer agrees within 3 ppm with its dimensional area, and within 10 ppm with the value obtained by its direct calibration against the controlled clearance piston gauge.

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“…The gas pressure scale which existed prior to 2008 used secondary standard piston gauges traceable to a mercury manometer known at NIST as the Gas Thermometer Manometer (GTM) [ 4 ]. A single piston gauge, designated at NIST as PG28, was calibrated against the GTM at 27 kPa and 95 kPa [ 5 ] in absolute mode. 3 PG28 is a Ruska 4 2465 model piston gauge, with a 20.7 mm diameter solid piston that is used up to 300 kPa.…”

Section: The Old and New Gas Pressure Scalesmentioning

confidence: 99%

A gas pressure scale based on primary standard piston gauges

Olson

Driver

Bowers

2010

J. Res. Natl. Inst. Stand. Technol.

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The National Institute of Standards and Technology (NIST) has redefined its gas pressure scale, up to 17 MPa, based on two primary standard piston gauges. The primary standard piston gauges are 35.8 mm in diameter and operate from 20 kPa to 1 MPa. Ten secondary standard piston gauges, two each of five series of the Ruska 2465 type, with successively smaller diameters form the scale extending up to 17 MPa. Six of the piston gauges were directly compared to the primary standards to determine their effective area and expanded ( k = 2) uncertainty. Two piston gauges operating to 7 MPa were compared to the 1.4 MPa gauges, and two piston gauges operating to 17 MPa were compared to the 7 MPa gauges. Distortion in the 7 MPa piston gauges was determined by comparing those gauges to a DH Instruments PG7601 type piston gauge, whose distortion was calculated using elasticity theory. The relative standard uncertainties achieved by the primary standards range from 3.0 × 10 −6 to 3.2 × 10 −6 . The relative standard uncertainty of the secondary standards is as low as 4.2 × 10 −6 at 300 kPa. The effective areas and uncertainties were validated by comparison to standards of other National Metrology Institutes (NMIs). Results show agreement in all cases to better than the expanded ( k = 2) uncertainty of the difference between NIST and the other NMIs, and in most cases to better than the standard ( k = 1) uncertainty of the difference.

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The reduction of uncertainties for absolute piston gauge pressure measurements in the atmospheric pressure range

Cited by 13 publications

References 6 publications

Comparison of pressure standards in the range 10 kPa to 140 kPa

Comparison of pressure standards in the range 10 kPa to 140 kPa

Intercomparison of the effective areas of a pneumatic piston gauge determined by different techniques

A gas pressure scale based on primary standard piston gauges

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