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H. Ishikawa, M. Takamoto, K. Shimizu, H. Monji, G. Matsui
DEVELOPMENT OF A VERY SMALL ULTRASONIC FLOWMETER FOR LIQUIDS

In this study, small disk ultrasonic transducers were used to develop a very small ultrasonic flowmeter with a measuring pipe diameter of less than 1 mm. The feasibility of using an ultrasonic flowmeter to measure a liquid flow rate below 1 mL/min was investigated experimentally. Calibration results of the developed ultrasonic flowmeter were almost all scattered within the range predicted from the standard deviation of measurements. The flowmeter can stably measure a flow rate of less than 1 mL/min with a standard deviation of about 0.01 mL/min. This result suggests that the flowmeter can be very useful for semiconductor, medical and chemical industries.

Michel J. A. M. van Putten, Pascal F. A. M. van Putten
A SILICON FLOW SENSOR FOR HIGHLY ACCURATE MASS FLOW MEASUREMENT

We describe a thermal, silicon integrated, mass flow sensor for highly accurate mass flow measurements over a large dynamic range. Offset-drift is completely eliminated by application of the VanPutten-ADM method. The method is illustrated using air. The total measurement uncertainty is typically < 1% of reading, with a turndown larger than 1:1000.

Mario R. Gongora-Rubio, Luis M. Sola-Laguna, Jorge J. Santiago-Aviles
MULTILAYER CERAMIC TECHNOLOGY APPLICATIONS TO MASS FLOW CONTROL

Micro-fluidic devices suitable to MFC were fabricated using LTCC technology from the emerging field of Meso-Scale systems. A multiplicity of hybrid devices can be developed using this flexible technology because this is a hermetic and compatible material ideal for fluidic systems.
Meso-fluidic devices as micro-valve, pressure, temperature sensor and critical orifices associated with fluidic interconnections can be integrated using LTCC technology in order to implement mass flow control systems for low flow and pressure ranges. We have measured several device parameters; micrographs of the fabricated devices and drawing of the proposed MFC are presented.

Claudio Garcia, Osmel Reyes Vaillant
STATE-OF-THE-ART OF THE FLOW MEASUREMENT OF HYDROCARBON GASES IN CUBA

This paper intends to give a general overview concerning the state-of-the-art of the gas flow measurement in the Cuban petroleum industry.

Fernando Rodrigues Garcia, Cláudia dos Santos
DEVELOPMENT OF OPEN CHANNEL METER CALIBRATION FACILITY

To overcome the disadvantage of building weirs and flumes, recently velocity-area meters have been developed, using that electromagnetic or ultra-sound Doppler effect principle. In these meters the wet area is evaluated using liquid column pressure or ultra-sound.
The importance of flow rate measurement of open channels is growing as a result of environmental impacts caused by the wastewater produced in metropolitan areas. This brings up the need of wastewater collection and treatment, where flow rate is a very important parameter.
This paper describes a prototype of a facility for the calibration of these new types of meters. This paper also describes the results of calibrations of one Ultra-Sonic Doppler meter and one electromagnetic meter.

Han Jian-guo, Sun Yan-zuo
DOUBLE APPROACH MODELING OF TP-  TABLE IN MASS FLOW-METER OF SUPERHEATED STEAM - COMBINED APPLICATION OF ARTIFICIAL NEURAL NETWORK AND SYSTEM IDENTIFICATION

In this paper a method based on combining Artificial Neural Network (ANN) training technique and Non-linear Least-square Linear in StructureSystem Identification technique for Double Approach Modeling the TP-Table in Mass Flow-meter is introduced. The model has several advantages such as saving calculation workload and storage space, having essential filterability of ANN Statistical Model. Thus the method provides a reliable way for realizing the current development for high- degree integration of measuring and instrumentation technology.

Kazumitsu Nukui, Mitsunori Komaki, Ken Tashiro
DEVELOPMENT OF THE GAS METER WITH THE THERMAL FLOW SENSORS ARRANGED ON THE SURFACE OF THE RECTIFIED FLUID PATH

Tokyo Gas Co., Ltd. has developed the new electronic gas meter with several thermal flow sensors for industrial use. We designed the proper structure of the rectifier and the arrangement of sensors experimentally. The paper describes the result of the experiment and the specifications of the meter.

Homero Fenner Filho
NATURAL GAS SYSTEM - FLOW MEASURING AND VOLUMETRIC BALANCE

This paper presents a computational system developed for the gas measuring management and for the accounting balance closure of an entire gas network. The system calculates for each measuring point an uncertainty and a quality value, based on the gas features, the equipment and the variables involved in the flow rate calculation. A mathematical programming model closes the balance, minimizing the weighed sum of the network adjustments of the flow rates.

J. Venâncio F. Monteiro, R. Domingos D’Oliveira
NEW METER READING TECHNIQUES APPLIED TO THE BRAZILIAN GAS MARKET

This article will describe applications of the automation and automatic meter reading techniques at the internal gas pipes installations design, considering residential and commercial buildings, and taking in account the tendency of rapid growth of the activities related to the natural gas industry in Brazil, as well as the recently development of new technologies that can be applied with affordable prices.
It will be analysed the application of an automatic meter reading technology in a building of several floors in São Paulo, which gas installations design is being carried up, with be purpose of making a comparative cost-effectiveness study with the traditional constructive methods applied in Brazil. As a result, it will be purposed a new commercialisation model for the gas in Brazil at the residential and commercial market.

Wen-Ti Lin, Jiunn-Haur Shaw, Hae Man Choi, Youn Kyun Oh
INTER-LABORATORY TESTS IN AIR FLOW STANDARD

A set of two laminar flow meters was used in 1998 as transfer standard for inter-laboratory tests in the range of l00 sccm ~ 1 slm on Brooks piston prover. Results were used for in-depth scrutinizing on the alignment of the vertical trigger mechanism and measuring volume, for possible leak checking and for improvements on secondary instruments of the piston prover at CMS. Further calibration, after such adjustment on the prover, shows an agreement of both sets of data within 0.2 %.
In 1999, an inter-laboratory test between CMS and KRlSS was conducted with the same set of laminar flow meters. Test results indicated a mean deviation no greater than 0.2 %, within the claimed measurement uncertainty. With the use of an Excel laser interferometer for piston stroke length measurement, repeatability of the piston traversing length is improved to 0.015 mm. Temperature measurements between inlet and outlet ports have agreement within 0.15 K with a temperature balancing helical tube installed upstream of the flow path. The pressure variation during the course of a piston stroke is maintained within 16 Pa after adjustment on the tapping location. Overall, an expanded measurement uncertainty of 0.15 % of reading can be achieved.
Subsequently internal tests of flow rates from 200 sccm to 12 slm were carried out among five different tubes with several mass flow meters. Comparison of test data in terms of mean error showed an agreement within 0.05 % ~ 0.1 % is achieved.

Page 404 of 977 Results 4031 - 4040 of 9762