Pressure Balance Cross-Calibration Method Using a Pressure Transducer as Transfer Standard

Scherschligt, Julia; Olson, D.A.; Rg, Driver; Yang, Yuanchao

doi:10.1080/19315775.2016.1149003

Cited by 10 publications

(3 citation statements)

References 3 publications

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“…Another similar research was described in [9]. A digital transducer was used to calibrate the pressure balance in the 350 kPa range.…”

Section: Introductionmentioning

confidence: 99%

Design of semi-automated calibration system for pressure balances

Türk,

Hamarat,

Durgut

2022

Metrology and Measurement Systems

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In this study, a digital manometer was used as a transfer standard to perform calibration of a pneumatic pressure balance. The same pressure balance was calibrated with the cross-floating method based on falling rate determination (FRD). Average of differences among the effective area results show an agreement of less than 10 ppm between the digital manometer-assisted calibration (DMAC) method and the FRD method. The method in which a digital pressure gauge is used as a transfer standard not only facilitates calibration but also enables the automation of pressure balance calibration. Full automation of pressure balance calibration requires an automatic mass loading system for both the reference instrument and the device under test. Since there is a lot of different kinds of pressure balances, it is nearly impossible for a pressure metrology laboratory to have an automatic mass-handler system for every type of pressure balance. Therefore, a more efficient way in which automated mass-handler systems are not required 𝑖.𝑒., a semi-automatic calibration system, is designed. For that purpose, two different calibration procedures, increasing-decreasing cycles, and pressurize-vent (P-V) procedures are performed and compared. The equivalence of procedure results makes the semi-automated calibration design of pressure balances possible. The most distinguishing advantages of a semi-automated calibration system are the applicability to any type of pressure balance and low cost compared to full automation.

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“…Another similar research was described in [9]. A digital transducer was used to calibrate the pressure balance in the 350 kPa range.…”

Section: Introductionmentioning

confidence: 99%

Design of semi-automated calibration system for pressure balances

Türk,

Hamarat,

Durgut

2022

Metrology and Measurement Systems

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“…Piston gauges (PGs) are traditionally used as primary and secondary pressure standards in national metrology institutes [12][13][14][15][16][17]. To achieve long-term pressure stability, many researchers first calibrate a pressure transducer using a piston pressure balance, then use the calibrated gauge output as the input for a pressure control feedback loop [18][19][20][21]. By contrast, in the system described here, the piston gauge is used directly for pressure control, thereby omitting the intermediate steps of pressure value transfer, which leads to more accurate pressure measurement and closed-loop stability.…”

Section: Introductionmentioning

confidence: 99%

Realization of ppm level pressure stability for primary thermometry using a primary piston gauge

et al. 2020

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To achieve an uncertainty of 0.25 mK in single-pressure refractive-index gas thermometry (SPRIGT), the relative pressure variation of He-4 gas in the range 30 kPa to 90 kPa, should not exceed 4 ppm (k=1). To this end, a novel pressure control system has been developed. It consists of two main parts: a piston gauge to control the pressure, and a home-made gas compensation system to supplement the micro-leak of the piston gauge. In addition, to maintain the piston at constant height, a servo loop is used that automatically determines in real time the amount of extra gas required. At room temperature, the standard deviations of the stabilized pressure are 3.0 mPa at 30 kPa, 4.5 mPa at 60 kPa and 2 mPa at 90 kPa. For the temperature region 5 K-25 K used for SPRIGT in the present work, the relative pressure stability is better than 0.16 ppm i.e. 25 times better than required. Moreover, the same pressure stabilization system is readily transposable to other primary gas thermometers.

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“…Building upon previous research [2], the team designed a new method using transducers to measure the pressure difference between the piston assemblies instead of using trim masses to achieve a balanced condition, with minimal effect on the final uncertainty of the calibration. In order to cover the full pneumatic pressure range, two transducers controlled by a custom built manifold are required.…”

Section: Approval For Implementation Of Application(s) To Be Used Formentioning

confidence: 99%