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...
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.
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...
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...
In this paper a method based on combining Artificial Neural Network (ANN) training technique and Non-linear Least-square Linear in Structure System 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.
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.
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.
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...
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....