Improvement and uncertainty evaluation of mercury sealed piston prover using laser interferometer

Choi, Hae-Man; Park, K.-A.; Oh, Youn Kyun; Choi, Yong Moon

doi:10.1016/j.flowmeasinst.2009.06.003

Cited by 19 publications

(9 citation statements)

References 3 publications

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“…Many variations on the piston prover technique exist. Some piston provers utilize a continuous piston position measuring sensor (such as a laser interferometer, an ultrasonic sensor, or a linear encoder) so that the velocity of the piston is measured [25,26]. There are versions of the piston prover which do not use a mercury seal, but instead have a 'clearance seal': a gap of about 10 μm between a piston made of graphite composite and the borosilicate glass collection cylinder.…”

Section: Piston Proversmentioning

confidence: 99%

Gas flow standards and their uncertainty

Wright¹,

Nakao²,

Johnson³

et al. 2022

Metrologia

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We review primary and working gas flow standards that are used to calibrate gas flow meters. For each type of primary standard, we describe the principles and practical considerations of its operation and describe one example implementation. We identify the practical limits of the example's performance, and, in many instances, we provide an uncertainty budget for a typical flow. The reviewed standards span the flow range 2.2 × 10-7 g/s to 520 kg/s. The references point to standards that operate at higher and at lower flows. The reviewed standards include volumetric flow standards (piston and bell provers, pressure-volume-temperature-time standards, rate of rise standards), static and dynamic gravimetric flow standards, and velocity × area standards such as critical flow venturis, laser doppler anemometer surveys, and multipath-ultrasonic meters. Finally, we describe working standard flow meters used in parallel to attain higher flows than economically practical via primary methods.

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Section: Piston Proversmentioning

confidence: 99%

Gas flow standards and their uncertainty

Wright¹,

Nakao²,

Johnson³

et al. 2022

Metrologia

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“…The piston facility needs precise measurement of cylinder or piston. Combined with the technical parameters of screw rod, the pulse equivalent or piston coefficient is calculated, and its uncertainty component is evaluated to determine the expanded uncertainty of the facility [6][7][8][9][10] .…”

Section: Uncertainty Analysis Of the Facilitymentioning

confidence: 99%

Piston gas flow standard Facility

Yang¹,

Liu²,

Xiang³

et al. 2023

Proceedings of the 19th International Flow Measurement Conference 2022 on Flow Measurement - FLOMEKO 2022

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Some gas flowmeters such as standard wet gas meter and critical flow Venturi nozzles are often used in the main standard of standard facility, and their accuracy is high, so its value transmission is particularly important. This paper introduces an active piston gas flow standard device. This paper introduces an active piston gas flow standard facility, which is composed of three active pistons and used in series. The measuring range can reach (0.01~128) m 3 /h, and the pistons can be automatically switched according to the required flow during the detection process. According to JJF 1586-2016 "Calibration Specification for Active Piston Provers", analysis the uncertainty of the active piston flow standard facility. It can be obtained that the expanded uncertainty of the device is Ur(V)=0.062%(k=2).Through the result of uncertainty evaluation, the standard facility can transmit the value to the gas flowmeter with higher accuracy level.

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“…The combined standard uncertainty uC is the square root of the sum of the squares of uA and uB determined by formula (4).…”

Section: Uncertainty Evaluationmentioning

confidence: 99%

Evaluation results of the new standard gas flow system at VMI: Piston prover system

Ngoc¹,

Xuan²,

Phan³

et al. 2023

Proceedings of the 19th International Flow Measurement Conference 2022 on Flow Measurement - FLOMEKO 2022

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Currently many National Metrology Institute (NMIs) as well as advanced calibration laboratories are using piston gas flow standards with mercury sealing method for gas flow calibration in the low pressure range. The flow in the small range is about cc/min. In this work, the low pressure gas flow calibration system at VMI is presented, designed and manufactured by the Taiwan National Metrology Institute, CMS/ITRI. The flow range is within (0.002 ÷ 24) L/min. The uncertainty of the reference system is assessed against the ISO/IEC Guide 98-3:2008 document, Uncertainty is evaluated from individual influence sources such as category A and B assessments. The standard uncertainty/relative standard uncertainty and degrees of freedom of the sources can be evaluated individually and then combined to produce a composite standard uncertainty/combined relative standard uncertainty and an effective degree of freedom. Finally, the relative expanded uncertainty is obtained by multiplying the relative standard uncertainty associated with a coverage factor at the 95% confidence level of the measurement result.

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Improvement and uncertainty evaluation of mercury sealed piston prover using laser interferometer

Cited by 19 publications

References 3 publications

Gas flow standards and their uncertainty

Gas flow standards and their uncertainty

Piston gas flow standard Facility

Evaluation results of the new standard gas flow system at VMI: Piston prover system

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