A. Borchling, C. Kroner
During the last years the share of electronic water meters based on ultrasonic or magnetic-inductive measuring principles installed in households has increased steadily. The question arises to what extent their measuring performance differs from that of classic mechanical water meters. Due to the static measuring principles without moving mechanical components, it is to be expected that electronic water meters are less susceptible to water properties. To gain insights in this regard experiments were conducted with different water qualities (pH, total hardness, particles). In addition, the...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.107
· Download
Liu Zhe, Wu Yan, Song Chaofan
Verification process for gas flow accurately adjust the actual problem of precision and quality control, research and development for more than a set of suitable for the working conditions of gas source in high-pressure natural gas metering intelligent detection system, the flow control of intelligent controller based on composite algorithm, using the three-dimensional laser scanning and BIM building information model technology to digital reduction verification yard, The industrial application of intelligent verification of natural gas real flow in China is realized. Dynamic processes such...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.106
· Download
Liu Yajie, Tian Peng, Liu Yizai, Zhang Yuanming
Water meter measurement data is the basis for users to pay water bills, sewage charges and some enterprises to pay water collection fees, the national administrative departments of measurement of water meters to implement the cycle of calibration, the use of the deadline, the expiration of the rotation of management. Because of the high cost of replacing a large number of water meters, and disassembly will affect the normal production and life of water, so there are still a large number of water meters have exceeded the rotation cycle but still in use. The lack of measurement and testing...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.105
· Download
Liu Wei, Li Li, Wang Zhiyu, Pan Qin, Huang Xin
In this paper, the flow measurement uncertainty of the VOCs sampler is analyzed in detail which is widely applied in environmental monitoring, medical and health care, factories, and mining enterprises. Based on the detection of the soap film flow-meter standard device and the mass flow-meter standard device, the mathematical and physical uncertainty model of the VOCs sampler is derived and obtained. The flow measurement uncertainty is evaluated and analyzed respectively based on the mathematical and physical uncertainty models of two standard devices. The relative expansion uncertainty of...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.104
· Download
P. G. Spazzini, G. La Piana, A. Piccato, V. Delnegro, M. Viola
Flow leaks are small devices that generate a well-determined flow when subject to a pressure differential (feed pressure). Such devices are widely used in the industry for the easy generation of flows, which can be used for several applications. In order to be correctly included in a Quality Management System (QMS), they need to be calibrated against a reference flow. Such calibration depends on the feed pressure and on the fluid density through a complex relation which can be derived from the modified Darcy law, therefore results of a calibration performed in a given condition are not...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.103
· Download
Lei Tan, Lixia Liu, Yang Liu, Yan Zou
In this paper, Monte Carlo method (hereinafter referred to as MCM) is used to evaluate the uncertainty of super-heated steam density. Through more than 800k simulation tests using the MCM ALCHIMIA software, the probability density function, coverage probability and coverage interval of the super-heated steam density are obtained, and the graphic shape of probability density function is analysed. In the process of evaluating the measurement uncertainty of superheated steam density, it is not rigorous to blindly define its probability distribution as uniform distribution. At the same time,...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.102
· Download
Y. W. Zhang, L. S. Cui, D. L. Xie, H. Zhang
Laser Doppler Velocimetry (LDV) is a single-point velocity measurement instrument. LDV can be precisely calibrated by the adjustable speed spinning-dics facility from NIM at speeds generally less than 40 m/s. However, due to its unique limitations, it is hard to calibrate LDV at a higher speed. To solve the problem of traceability of LDV high-speed measurement results and of the applicability of LDV low-speed calibration results under high-speed conditions, it is analyzed that the uncertainty of velocity depends on both interference fringe spacing and Doppler frequency. As fringe spacing is...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.101
· Download
Yuan Liu, Heming Hu, Zhanhong Shi, Shukai Zhou, Jiaming Shen
The main expression of the calibration results of rotating element current meter is based on the approximate linear relationship between rotation rate and velocity, and the uncertainty evaluation method is not perfect. A technical scheme with hydraulic pitch as the result of calibration is studied, and the uncertainty can be devided to standard current velocity, rotation rate and hydraulic pitch. The measurement and uncertainty evaluation method of unit velocity and background velocity are studied based on the water velocity calibration platform. The calculation method of unit rotation rate...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.100
· Download
Zhang Ying, Yang Fan,Wan Lifen, Xiong Qian, Chen Ling
Standard metal gauge, especially the first class metal gauge, it is mainly responsible for the second class, third class standard metal gauge value transfer function; In the actual verification work of standard metal gauge, if the level deviates from the source position or is not adjusted for human reasons, the accuracy of the measurement results will be directly affected, resulting in the deviation of the measurement value transmission. By studying the influence of the level deviation from the tracing position of the leveler on the level, the deviation function of the measuring neck and the...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.099
· Download
C. Aprea, L. Canale, M. Dell’Isola, G. Ficco, A. Maiorino
In 2012 the Energy Efficiency Directive (EED) has set mandatory installation of individual metering and submetering systems for accounting thermal energy consumption in buildings where centralized heating/cooling sources are present, when technically feasible and cost efficient. As a consequence, direct thermal energy meters or indirect heat accounting systems have spread widely in residential buildings, for metering and sub-metering in space heating applications. On the other hand, individual metering of thermal energy in space cooling is a difficult task, due to the very different types of...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.098
· Download