Mengna Li, Bodo Mickan, Chunhui Li, Jia Ren, Yan Wu, Ming Xu
The first formal comparison was organized in China for the purpose of determination of the degree of equivalence of the gas flow secondary standard facilities during 2016 ~ 2020. There were 4 participants from China, and PTB was invited as the link lab to connect this comparison with the serial key comparisons of CCM.FF.K5. Based on the flow range of the existing secondary standard facilities of participating laboratories, 3 turbine flow meters were used as transfer standards. Totally 298 sets of measured data were obtained with Reynolds number range of (6.3 × 10^4 ~ 1.4 × 10^7). Results of...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.077
· Download
A. W. Boudaoud, J. D. McGraw, T. Lopez-Leon, F. Ogheard
As part of the Metrology for Drug Delivery ("MeDD II") European joint research project, a primary method for the measurement of liquid flow rates at the nanolitre per minute scale has been developed. This primary standard allows the calibration of flow meters and flow generators such as infusion pumps, pressure controllers and syringe pumps, for flow rates ranging from 10 nL/min to 1500 nL/min with relative expanded uncertainties (k = 2 ) of 12 % and 0.15 %, respectively. The system is based on the measurement of the displacements over time of a liquid/air interface moving inside a...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.076
· Download
P. Žibret, G. Bobovnik, J. Kutin
The gas flow standards using the volumetric method with a constant volume (pVTt) determine the flow rate based on the rate of mass change determined by measuring the density of the gas inside a constant volume. These standards normally use the static method of mass determination and rarely the dynamic one, due to dynamic changes of the gas temperature during mass collection. We have developed the analytical model that predicts the change of temperature in the pVTt system for gas flow rates up to 12 mg/min. Both measurement methods, the static and the dynamic, were implemented in the...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.075
· Download
Jun Ma, Yejun Chen
According to the JJG 1113-2015 “Verification Facility for Water Meters” calibration regulations, when testing the verification facility for water meters of Piston, the indication error and repeatability of the main standard implement are determined by two parameters, namely the verification volume and flow rate. Experiments show that the setting of two parameters affects the verification results, when the flow rate is set to 25 L/h and the verification volume is 2 L, the indication error and repeatability of the main standard implement meet the requirements of the verification regulation;...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.074
· Download
M. A. de Huu, M. Tschannen, Hugo Bissig
METAS is the Swiss national metrology institute. Its laboratory for flow operates several primary standards for liquid and gas flow, among which two piston provers with BIPM-registered CMC entries in the range (0.1 to 300) L/min. To extend their functionality, additional working modes have been implemented in the data-acquisition software that allow almost endless measurement possibilities over the flow range (0.002 to 300) L/min. With the current extension of functionalities, all types of flow meters, from critical nozzles to laminar flow elements can now be calibrated under various...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.073
· Download
Yuan Liu, Heming Hu, XueLing Qiu, Deyue Zou
The purpose of this paper is to explore the potential of calibration of ADCP discharge measurement in open channel, which conclusion can improve the traceability of ADCP. In this paper, the current velocity and discharge synthesis and other important issues are taken into consideration, and establishes a set of rectangular open channel standard discharge facility, and conducts experimental research on the flow measurement by using Workhorse. The moving boat ADCP measurement uncertainty source is analyzed, and the error situation introduced by the approximate solution is analyzed. By...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.072
· Download
Han Zhang, Liang Wang, Xinli Dong, Donghong Huang,Peijuan Cao, Yong Li, Ronghui Shang, Shihui Zeng, Xuejian Li
In order to meet the traceability requirements of city gas flow meters, the city gas flow standard facility was built based on master meter method. As the non-fixed usage of master meters and the low temperature of natural gas, the uncertainty evaluation and control of the standard facility were investigated. The results showed that the standard facility used four turbine flowmeters as master meters and has mobility, while the achievable flowrate range is within (60 ~ 8600) m³/h and the pressure range of (2 ~ 4) MPa. The uncertainty of the non-point usage of the master meters was controlled...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.071
· Download
Biyu Zhu, Chao Chen, Li Ma
A gas flowmeter for measuring low flow rate has been widely used in the field of medical, health, environmental protection, energy industry, aerospace, etc. To against Covid-2019, the requirement on the low flow rate has been increasing dramatically. At present, the typical standard devices for calibrating low gas flowmeter mainly include standard bell provers of gas flow, standard piston provers of low gas flow and standard laminar of low gas flow. Different measuring principles are adopted among these typical standard devices. To ensure the consistency of these typical standard devices, a...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.070
· Download
F. Arpino, L. Canale, M. L. Cassano, G. Cortellessa, M. Dell’Isola, G. Ficco, A. Tagliabue, F. Zuena
One of the main issues in natural gas transmission networks is represented by the so-called Unaccounted-for-Gas (UAG), that is the amount of gas related to the unavoidable measurement and estimation errors in the balancing equation of the network. In particular, accuracy of flow-rate measurement in transmission network pipelines is a very crucial issue due to the numerous related metrological criticalities. This paper is aimed at evaluating the influence of the flow-meter accuracy on UAG. To this aim, the rangeability limits of the flow-rate measuring device in delivery points characterized...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.069
· Download
Huancheng Yang, Jiamin Zhao, Hongyan Geng, Xiaocheng Xu, Min Zhang
To fulfil calibrating of LNG dispenser verification device, the traceability system of the device was researched in this paper. Using a combination of dynamic and static quality measurement system, with high accuracy electronic balance as main standard, ultra-low temperature commutator with uncertainty of better than 1.5 × 10-4 was developed. The device could realize automation during the whole procedure of data collection under the specified flow, the calibration of LNG dispenser verification device, processing the data and generating the records and certificates.
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.068
· Download