An Intelligent Flow Measurement Scheme using Ultrasonic Flow Meter

2012 ◽  
Author(s):  
Santhosh K. Venkata ◽  
Binoy K. Roy
Keyword(s):  
Flow Measurement ◽  
Flow Meter ◽  
Measurement Scheme ◽  
Ultrasonic Flow Meter

An Effective Thermal Flow Meter Based on TDC-GP1 Chip

2012 ◽  
Vol 499 ◽  
pp. 409-413
Author(s):  
Jing Hou ◽  
Wan Jiang Zhang ◽  
Yan Ling Sun
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Flow Measurement ◽  
Time Difference ◽  
Low Power Consumption ◽  
Thermal Flow ◽  
Time Intervals ◽  
Flow Meter ◽  
Difference Type ◽  
Ultrasonic Flow Meter

In this paper, an effective and innovative thermal flow meter is presented. It is based on TDC-GP1 chip and the principle of time difference type ultrasonic flow measurement. Ultrasonic flow meter is applied widely and has some advantages such as non-contact, easily installed and maintained. But it is necessary to make the meter work more stable. The method of time difference can improve the stabilization and measured precision of the ultrasonic flow meter. TDC-GP1 is a chip which can transform time intervals into digital values with high precision. The design of the ultrasonic thermal flow meter is given details in the paper. Results of the experiments show that the innovative meter has low power consumption and high measured precision.

In-Situ Calibration for Feedwater Flow Measurement

2002 ◽  
Author(s):  
David Peyvan ◽  
Yuri Gurevich ◽  
Charles T. French
Keyword(s):  
Velocity Profile ◽  
Flow Measurement ◽  
Cross Correlation ◽  
Operating Conditions ◽  
Integration Scheme ◽  
Flow Meter ◽  
In Situ Calibration ◽  
Profile Correction ◽  
Ultrasonic Flow Meter

With the approval by the Nuclear Regulatory Commission (NRC), of the Appendix K power uprates, it has become important to provide an accurate measurement of the feedwater flow. Failure to meet documented requirements can now more easily lead to plant operations above their analyzed safety limits. Thus, the objective of flow instrumentation used in Appendix K uprates, becomes one of providing precise measurements of the feedwater mass flow that will not allow the plant to be overpowered, but will still assure that maximum licensed thermal output is achieved. The NRC has licensed two technologies that meet these standards. Both are based on ultrasonic measurements of the flow. The first of these technologies, which is referred to as transit-time, relies on the measurement of differences in time for multiple ultrasonic beams to pass up and downstream in the fluid stream. These measurements are then coupled with a numerical integration scheme to compensate for distortions in the velocity profile due to upstream flow disturbances. This technology is implemented using a spool piece that is inserted into the feedwater pipe. The second technology relies on the measurement of the velocity of eddies within the fluid using a numerical process called cross-correlation. This technology is implemented by attaching the ultrasonic flow meter to the external surface of the pipe. Because of the ease in installation, for atypical situations, distortions in the velocity profile can be accounted for by attaching a second ultrasonic flow meter to the same pipe or multiple meters to a similar piping configuration, where the flow is fully developed. The additional meter readings are then used for the calibration of the initial set-up. Thus, it becomes possible to provide an in-situ calibration under actual operating conditions that requires no extrapolation of laboratory calibrations to compensate for distortions in the velocity profile. This paper will focus on the cross-correlation method of flow measurement, starting with the theoretical bases for the velocity profile correction factor and its reliance on only the Reynolds number to produce an accurate measurement of the flow, when the flow is fully developed. The method of laboratory calibration and the verification of these calibrations under actual plant operating conditions will be discussed. This will be followed by a discussion of how this technology is being used today to support the Appendix K uprates. Various examples will be presented of piping configurations, where in-situ calibrations have or will be used to provide an accurate measurement of the feedwater flow at a specific location.

Research on High-Accuracy Low-Power Ultrasonic Flow Measurement and Instrument

2011 ◽  
Vol 301-303 ◽  
pp. 646-652
Author(s):  
Wei Guo Zhao ◽  
Xue Song Zhao
Keyword(s):  
Power Consumption ◽  
Flow Measurement ◽  
Measurement Method ◽  
High Accuracy ◽  
Flow Meter ◽  
Micro Power ◽  
Operating Current ◽  
Average Operating ◽  
Ultrasonic Flow Meter ◽  
High Power Consumption

In order to solve the problem of low accuracy and high power consumption, A new ultrasonic flow measurement method was proposed in this paper. With this method, the influence of the delay-time in the circuit was eliminated,the temperature of fluid was compensated automaticly and the accuracy of the flow measurement was improved. The ultrasonic flow-meter was designed with the micro-power timing chips TDC-GP2 and MSP430F435, which reduced the power consumption effectively. The experimental results showed that the accuracy of the ultrasonic flow-meter was 1.5% and the average operating current was lower than 35uA.

scholarly journals Performance optimization of ultrasonic flow meter based on computational fluid dynamics

2018 ◽  
Vol 10 (8) ◽  
pp. 168781401879326 ◽  
Author(s):  
Shanbi Peng ◽  
Wen Liao ◽  
Huan Tan
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Performance Optimization ◽  
Evaluation Method ◽  
Flow Meter ◽  
Rectification Effect ◽  
Ultrasonic Flow Meter ◽  
Accuracy Of Measurement ◽  
Nature Gas ◽  
Measuring Tool

As a common nature gas measuring tool, ultrasonic flow meter is more and more put into use. Therefore, the accuracy of measurement is what we concern the most. The performance of ultrasonic flow meter is closely related to fluid state which flows through it. This article identified the evaluation method of rectification effect of gasotron and its implementation steps. It proposed an assessing index Lmin based on dichotomy. Computational fluid dynamics method is used to simulate the model of an upstream straight pipe section with a header and plate gasotron, which obtained the assessing index Lmin in five different transmission conditions. Finally, the feasibility of the gasotron is validated against comparing indication errors in different installation conditions: with a header, benchmark, with a header and gasotron.

scholarly journals Horizontal Air-Water Two-Phase Flow Measurement Using an Electrical Impedance Probe and a Venturi Flow Meter

2019 ◽  
Vol 1224 ◽  
pp. 012040
Author(s):  
G Chiesa ◽  
C Bertani ◽  
N Falcone ◽  
A Bersano ◽  
M DE Salve ◽  
...  
Keyword(s):  
Flow Measurement ◽  
Electrical Impedance ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Flow Meter ◽  
Two Phase ◽  
Impedance Probe ◽  
Venturi Flow Meter
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