Uncertainty evaluation procedure and intercomparison of bell provers as a calibration system for gas flow meters

Choi, Hae-Man; Park, Kyung-Am; Oh, Youn Kyun; Choi, Yong Moon

doi:10.1016/j.flowmeasinst.2010.07.002

Cited by 9 publications

(7 citation statements)

References 6 publications

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“…To control the air ventilation speed at low pressures, sonic nozzles, also known as critical flow Venturi, are used. The sonic nozzles are fabricated as toroidal-throat Venturi nozzles to comply with the ISO 9300 standard (ISO, 2005) and calibrated using a low-pressure gas flow standard system at KRISS (Choi et al, 2010). Thus, the reference value and SI traceability of the ventilation speed are obtained by using the sonic nozzles in the UAS.…”

Section: Pressure and Ventilation Speed Control Through Sonic Nozzles...mentioning

confidence: 99%

Radiation correction and uncertainty evaluation of RS41 temperature sensors by using an upper-air simulator

et al. 2022

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Abstract. An upper-air simulator (UAS) has been developed at the Korea Research Institute of Standards and Science (KRISS) to study the effects of solar irradiation of commercial radiosondes. In this study, the uncertainty in the radiation correction of a Vaisala RS41 temperature sensor is evaluated using the UAS at KRISS. First, the effects of environmental parameters including the temperature (T), pressure (P), ventilation speed (v), and irradiance (S) are formulated in the context of the radiation correction. The considered ranges of T, P, and v are −67 to 20 ∘C, 5–500 hPa, and 4–7 m s−1, respectively, with a fixed S0=980 W m−2. Second, the uncertainties in the environmental parameters determined using the UAS are evaluated to calculate their contribution to the uncertainty in the radiation correction. In addition, the effects of rotation and tilting of the sensor boom with respect to the irradiation direction are investigated. The uncertainty in the radiation correction is obtained by combining the contributions of all uncertainty factors. The expanded uncertainty associated with the radiation-corrected temperature of the RS41 is 0.17 ∘C at the coverage factor k=2 (approximately 95 % confidence level). The findings obtained by reproducing the environment of the upper air by using the ground-based facility can provide a basis to increase the measurement accuracy of radiosondes within the framework of traceability to the International System of Units.

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Section: Pressure and Ventilation Speed Control Through Sonic Nozzles...mentioning

confidence: 99%

Radiation correction and uncertainty evaluation of RS41 temperature sensors by using an upper-air simulator

et al. 2022

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show abstract

“…To control the air ventilation speed at low pressures, sonic nozzles, also known as critical flow Venturi, are used. The sonic nozzles are fabricated as toroidal-throat Venturi nozzles to comply with the ISO 9300 standard (Iso, 2005) and calibrated using low-pressure gas flow standard system at KRISS (Choi et al, 2010). Sonic nozzles can be used to achieve a specific maximum constant flow when the ratio of the downstream pressure (Pe) to the upstream pressure (Po) is smaller than a certain critical point (Pe/Po < Pc/Po).…”

Section: Pressure and Ventilation Speed Control Through Sonic Nozzles And A Vacuum Pumpmentioning

confidence: 99%

Radiation correction and uncertainty evaluation of RS41 temperature sensors by using an upper-air simulator

Lee

Kim

Lee

et al. 2021

Preprint

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Abstract. An upper-air simulator (UAS) has been developed at the Korea Research Institute of Standards and Science (KRISS) to study the effects of solar irradiation of commercial radiosondes. In this study, the uncertainty of the radiation correction of a Vaisala RS41 temperature sensor is evaluated using the UAS at KRISS. First, the effects of environmental parameters including the temperature (T), pressure (P), ventilation speed (v), and irradiance (S) are formulated in the context of the radiation correction. The considered ranges of T, P, and v are −67 to 20 °C, 5–500 hPa, and 4–7 m·s−1, respectively, with a fixed S0 = 980 W·m−2. Second, the uncertainties in the environmental parameters determined using the UAS are evaluated to calculate their contribution to the uncertainty in the radiation correction. In addition, the effects of rotation and tilting of the sensor boom with respect to the irradiation direction are investigated. The uncertainty in the radiation correction is obtained by combining the contributions of all uncertainty factors. The expanded uncertainty associated with the radiation correction for the RS41 temperature sensor is 0.119 °C at the coverage factor k = 2 (approximately 95 % confidence level). The findings obtained by reproducing the environment of the upper air by using the ground-based facility can provide a basis to increase the measurement accuracy of radiosondes within the framework of traceability to the International System of Units.

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“…Selain itu, bisa diatur jumlah volume gas yang dialirkan sesuai dengan kondisi pengujian. Untuk meningkatkan akurasi pengukuran jarak dengan sensor ultrasonik, bisa ditingkatkan menggunakan laserrangefinder atau laser-interferometer [7].…”

Section: Pendahuluanunclassified

Pemanfaatan Sensor Ultrasonik Sebagai Alat Bantu Pembacaan Skala Volume Pada Bell Prover

Firmansyah¹,

Hadisupadmo²,

Elviya³

et al. 2020

JOKI

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Fasilitas laboratorium pengujian meter gas di Direktorat Metrologi Kementerian Perdagangan menggunakan bell prover sebagai standar. Bell prover yang tersedia masih menggunakan skala jenis mekanis dengan rentang 100-600 liter dan 1 liter per skala. Ketidaktepatan membaca skala mekanis dapat mempengaruhi hasil pengujian meter gas. Untuk itu dibuat alat bantu pembacaan volume bell prover dengan sensor ultrasonik tipe HC-SR04 yang dipasang pada arduino. Alat bantu ini memanfaatkan jarak bobot pengatur kecepatan pada bell proverterhadap lantai. Perubahan ketinggian bobot pengatur kecepatan sebanding dengan perubahan ketinggian skala volume. Alat bantu ini memiliki akurasi terkecil sebesar 83,17% dan kesalahan sebesar 16,83% pada volume 100 liter, sedangkan akurasi tertinggi sebesar 99,76% dan kesalahan terkecil sebesar 0,02% pada volume 600 liter.

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Uncertainty evaluation procedure and intercomparison of bell provers as a calibration system for gas flow meters

Cited by 9 publications

References 6 publications

Radiation correction and uncertainty evaluation of RS41 temperature sensors by using an upper-air simulator

Radiation correction and uncertainty evaluation of RS41 temperature sensors by using an upper-air simulator

Radiation correction and uncertainty evaluation of RS41 temperature sensors by using an upper-air simulator

Pemanfaatan Sensor Ultrasonik Sebagai Alat Bantu Pembacaan Skala Volume Pada Bell Prover

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