Song chaofan, Wu yan, Liu zhe, Hao min
To improve the quality control performance on quantity transfer made by gas standard facility, the integrity managementconcept is applied to the quality control of quantity transfer in this study, and a "four-step method" is proposed. Herein,the application of calibrating a critical flow Venturi nozzle(CFN) with the mt gas standard facility is shown as anexample. By applying the four-step method, it is possible to accurately identify the key influencing factors and quantitatively analyze their influence on the measurement results, conduct risk assessment and risk prediction for...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.117
· Download
Mengna Li, Chengze Lv, Wenli Li, Chunhui Li
To guarantee the accuracy of ultrasonic flowmeter, an in-use measurement system for ultrasonic flowmeter incorporating digital signal processors and machine learning approaches was proposed. Experimental analysis has been carried out to determine the variables affecting the accuracy of ultrasonic flowmeter. Based on random forest algorithm, we evaluated the contribution of different variables on the accuracy performance of ultrasonic flowmeter, and establish a model including variables extraction and prediction of flow deviationfor in-use measurement of ultrasonic flowmeter. By obtaining...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.116
· Download
Bo Wu, Yong Wan, Bibo Qian, Tao Meng
The performance of large diameter water flow facility will have a direct impact on the accuracy and value uniformity of detected flowmeter measurement results. In addition, ensuring the stability and reliability of facility performance has always been a key link in the traceability and transmission of value of large water flow. However, the application scale and measurement capability of existing large diameter facilities are difficult to fully meet social needs. In this paper, based on National Institute of Metrology (China), provincial metrology institutes and related flow enterprises,...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.115
· Download
Liu xun, Luo Caiping , Liu Renhuai
The existing membrane gas meter has the disadvantages of low measurement accuracy and difficult to realize remote monitoring. The new ultrasonic gas meter can solve these problems after adopting the new Lora communication technology. This paper describes the measurement principle of the ultrasonic gas meter and the components of the ultrasonic gas meter. The hardware composition block diagram of the gas meter and the design idea of low power consumption are described. The software design framework and main design flow chart of the gas meter are described. The detailed design of segment code...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.114
· Download
M. D. Schakel, F. Gugole, D. Standiford, J. Kutin, G. Bobovnik, N. Mole, R. Maury, D. Schumann, R. Kramer, C. Guenz , H.-B. Böckler, O. Büker
The EU aims to be climate-neutral by 2050 and usage of liquid hydrogen (LH2) for transportation is expected to grow fast. With the expected uptake, traceability in custody transfer is required. Existing metrological infrastructure can be used to provide traceability with basic calibrations performed typically under ambient conditions. However, due to the very challenging LH2 process conditions, with temperatures as low as 20 K, there is a need to determine the flow measurement uncertainty at these process conditions. Within the Joint Research Project (JRP) 20IND11 “Metrology infrastructure...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.113
· Download
H. M. Moțit, P. Mate
There are presented the developments ensured by a new worldwide flow measurement structure, based on the reaction force, "the extended reaction flowmeter" ,elaborated by the first author, the subject matter of the patent application filed with European Patent Office EP 21020546, together other reaction flowmeters without moving parts.Initially are synthetically reitered the constructive and structural specificities of "the extended reaction flowmeters" (shortly "ERF").Then, starting from the facilities offered by the specific structural scheme of the ERF, significant simplified compared to...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.112
· Download
Hu Wenqing, Xu Zhipeng, Zhang Gaoming, Guo Jing
pVTt has been employed as the primary gas flow standard in many countries due to its unique advantages like high accuracy, simple structure, low maintenance, etc. However, its calibration efficiency is relatively low because of the long stabilization time of intake and outtake procedures. To reduce the stabilization time, a novel pVTt gas flow standard with active thermal compensation was proposed. Above all, structure andprinciple of the new pVTt standard device was introduced. Subsequently, the numerical simulation was performed to investigate the influence of thermal compensation....
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.111
· Download
K. F. Zhang, S. Zhang, B. Gao, W. H. Zhou, L. S. Yang
At present, as an important measuring instrument for measuring sewage discharge, the principle of open channel flowmeter is the functional relationship between liquid level and flow. By measuring the liquid level of water flow in the tank, and then according to the flow value of the relationship between liquid level and flow in the corresponding Parshall flume, therefore, the accuracy of Parshall flume size is closely related to its measurement accuracy. In this paper, we introduce a kind of adjustable size of Parshall flume. Through experiments, we find out the relationship between the flow...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.110
· Download
Xuejing Li, Xinhong Yao, Yuan Jin, Haiyang Li
Liquid lead-bismuth eutectic (LBE) is one of the preferred materials for accelerator driven subcritical(ADS) transmutation targets and coolants in fourth-generation nuclear reactors. Due to the complex and interacting physical and chemical factors in the measurement process of LBE in high temperature operating environment, it is very difficult to control the flow and on-line calibration, resulting in the slow development of LBE flow meter technology, which hinders the fourth Generation nuclear reactor technology development. Electromagnetic flowmeter is currently recognized as one of the...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.109
· Download
Xiao Ming, Juergen Kompenhans, Xuejun Sun
This paper aims to reveal the relation between pipe flow control and accurate flow metering. Every flow meter is subject to installation effects, because it is calibrated in a fully developed pipe flow (standard pipe flow), that is usually different from the flow condition in the industrial application. Dimensional analysis for flow meters identifies a set of similarity criteria. Kinematic similarity requires to keep the same velocity profile both for calibration and application, that is usually difficult. In order to control the velocity profile of the pipe flow, a spindle-shaped central...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.108
· Download