K. Peng, C. Q. Zhou, W. H. Deng
Variable area flow meters or rotameters have been widely used for flow monitoring of industrial process, particularly where the cost is the first priority. However, with the constant demands for process digitization, remote data transmission, data log, flow level register and alarm triggered automation have been highly demanded. These characters are not available for the rotameters while the low cost barrier prevents other existing technology to provide the same solution. MEMS mass flow technology on the other hands, is ready to emerge for these applications. In this paper we present the...
Y. Feng, C. M. Jiang, W. H. Deng
Peristaltic pumping is a common process in chemical, biomedical and pharmaceutical applications. However, the actual measured flow is frequently found to be erroneous with an accuracy no better than 10%. In this paper we present a design of the precise fluid metering sensing technology using MEMS thermal time-of-flight principle in a close loop with the peristaltic pumping for the bio-fluidic analyser. The data indicate that the MEMS fluidic meter could significantly improve the accuracy and control of the fluid delivery within 5% which not only substantially reduces the cost but boosts the...
T. Chinarak, K. Leetang, T. Changpan
The liquid piston provers have been widely used as the primary standard for liquid flow measurement. There are many flowmeters which can be used with the prover such as turbine flowmeters, variable area flowmeters, electromagnetic flowmeters, etc. The flowrates from the prover are measured by volumetric method. Thus, the displaced volume of water and the moving distance of the piston during measurement are the key factors. In order to receive the accurate volume, the efficient system for gaining pulses from the linear encoder is needed. Also, temperature and pressure of liquid inside the...
Richard Fertell
Description of an international standard that is complied with as part of the CE Mark or certified by factory audit for product safety marks, to ensure that all liquid, gas and LPG/LNG flow rate measurement technology specifications are consistent for evaluation and comparison as well as to document and advance the state-of-the-art of flow rate measurement technologies.
Dean M. Standiford
In 2000, Micro Motion, Inc. presented a paper at FLOMEKO introducing a new system for calibrating its flow meters referred to as a Transfer Standard Method (TSM) liquid calibration system. The transfer standards for this system are Coriolis reference meters installed in parallel. The stability of the reference meters is one of the largest contributors to the overall measurement uncertainty in this system. To reduce the measurement uncertainty, reference meters are limited in flow range and two reference meters of each size are used as a quality check with one installed upstream of the unit...
Henry Abril, Jose A Fuentes, Jorge Reyes, Juan M. Ortiz, John F. Velosa
In this paper, a metrological control proposal is described for exclusive application to ultrasonic flowmeters (USMs) operating at low (atmospheric) pressures. This is based on tests performed on 2 new flow meters DN150 (6") which were calibrated at first in PIGSAR (Germany) using natural gas at high pressure, as test fluid, and later characterized by air at atmospheric pressure in CDT de GAS (Columbia).
Johannes Lanzersdorfer, L. Götsch
Manufacturers of large-scale hydraulic machines face high liquidated damages if they can not meet performance guarantees due to contractual stipulations. Accurate determination of efficiency, power and flow is therefore of major interest. For plants exceeding heads of 100 m, the thermodynamic method represents the standard method. We present a mathematical refinement that uses additional power measurements to yield an analytical solution of the flow. Under favourable conditions, the measurement uncertainty is lower compared to that of other absolute flow measuring methods. With higher heads...
K. Leetang, P. Samanpiboon, T. Chinarak
Intravenous Administration Set (IV Set) is one of medical devices that have been generally used in hospitals. Then, the primary standard calibration system appeared in this paper was set according to the IEC60601-2-24. The flow rate, volume and mass of distilled water which flowing through different IV sets are measured by using 1 mg resolution weighing balance, photoelectric sensors and data acquisition system. This is paper presents drop volume estimation compared with three different methods; surface tension calculation, drop counted by photoelectric sensor and gravimetric method. The...
Christopher David, Claus Melvad, Hugo Bissig, Elsa Batista
This papers presents the results obtained in a research inter-comparison organized in the framework of the development of traceable micro flow facilities for liquids within the EMRP project "HLT07 Metrology for Drug Delivery". The paper presents the protocol of the comparison and the first results revealing some discrepancies between the laboratories.
C. Melvad, J. Frederiksen
The Danish Technological Institute has extended their primary lab liquid calibration range from 5 l/h and down to 1 µl/h using gravimetric set-ups. The calibration uncertainty is between 0.05 % and 0.5 %, but the uncertainty still needs to be validated by an intercomparison. A secondary objective when building the standards was to enable dynamic measurement, enabling characterization of varying or pulsating flows. In the paper the design details of the systems going from large flow rates to small flow rates are discussed. Evaluation measurements made to assess the performance of the set-ups...