Simple Analysis of Design of Automatic Verification System of Vortex Flow Meter

Abstract: Simple analysis of the design information of the vortex flowmeter automatic verification system is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. With the development of the national economy, especially the implementation of the strategy of the rise of the central region, there are more and more chemical and food enterprises in Wuhan, and the requirements for the use and calibration of small-diameter vortex flowmeters are getting higher and higher, making small-diameter vortex flowmeters more and more demanding. Metering is subject to increasing weight. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is a simple analysis of the design of the automatic verification system for vortex flowmeters. With the development of the national economy, especially the implementation of the strategy of the rise of the central region, there are more and more chemical and food enterprises in Wuhan, and the requirements for the use and calibration of small-diameter vortex flowmeters are getting higher and higher, making small-diameter vortex flowmeters more and more demanding. Metrology is getting more and more attention. At present, most flow meter verification systems are completed manually. The flow rate is calibrated by manually adjusting the gate valve upstream of the standard device. There is no visual operation interface, and the work is time-consuming and laborious. cause great harm to the body. The automatic verification device of vortex flowmeter based on C++Builder not only solves the above problems well, but also has the advantages of simple hardware connection, easy programming and beautiful operation interface. C++Builder is an open environment, which makes it very easy to interface with any measurement hardware; it is a graphical programming language, easy to use and easy to learn, and it provides tools that make programming easier than using other The language is several times faster; it provides flexible debugging methods, both breakpoints and probes can be set, and changes in data flow can be observed while the program is running. The design principle of the verification system 1.1 The working principle of the quality method Install the tested flowmeter into the test pipeline as required, start the water pump, and pump the water in the pool into the water tower or high-level water tank. When the water begins to overflow, turn on the switches in turn. The valve and regulating valve make the water flow into the pool through the tested vortex flowmeter, commutator and bypass pipeline. When starting the test, after operating the regulating valve to adjust the flow to the required flow rate, start the commutator to change the water from the bypass pipeline into the weighing container, and trigger the timing and counting system to start recording the displayed value and measurement time of the tested flow rate. , When the predetermined amount of water is reached, the commutator is operated, so that the water is changed from the weighing container into the bypass pipeline, and the flow meter and the timer signal recording are stopped at the same time. Compare the weighing value of the electronic scale with the output flow value of the flowmeter under test to determine the measurement characteristics of the flowmeter under test. Recommendation of related articles: Analysis of the results of using the calibration device to verify the accuracy of the pressure transmitter 1.2 The working principle of the standard table method The standard table part of the flow standard device can be composed of a single standard table, as shown in Figure 1. It can be composed of multiple standard meters in parallel. Its main working principle: using a standard vortex flowmeter (which can be a velocity flowmeter, a positive displacement flowmeter, a critical flow flowmeter, a mass flowmeter and a thermal energy meter, etc.) Compare the output flow value of the standard flowmeter and the tested flowmeter to determine the measurement performance of the tested flowmeter. Design of driver program and software of verification system 2.1 Driver program The hardware driver program is the programming interface of the application software to the hardware. It contains the operation commands that the specific hardware can accept, and completes the data transfer with the hardware. The VISA function is used in the communication between the industrial computer and the instrument. First, use the VISAOPEN function to open the instrument communication; secondly, write a certain sentence into the regulator with VISAWRITE. After completing the corresponding operation, the computer reads the data collected by the regulator through the VISAREAD function. After the operation is completed, use the VISACLOSE function to close the communication with the instrument. The driver program contains statements that the regulator can recognize. These statements can be found in the manual of the regulator. The statements include the selection, type, channel to be closed, digital filtering and several measurements of the physical quantity unit to be measured. Wait. Recommended articles: Sanchang Differential Pressure Transmitter wins reputation for its quality and service 2.2 Design of the operation interface The operator selects the automatic/manual calibration point input mode, the automatic/manual opening mode selection, the volume flowmeter/mass flowmeter in turn After selection, press“start detection”Press the button to run the program, you can select a certain calibration pipeline, open the air valve according to the flow at the calibration point, wait for the flow to stabilize, measure the pressure, temperature, etc. of the calibration pipeline in turn, calculate the standard flow, measure the flow, and record the obtained data in the Flowmeter verification record sheet. according to“Test result”button to view the verification record; press“print certificate”Press the button to print the certificate; if the pressure exceeds the range during the verification process, the alarm indicator will immediately change from green to red, alerting the operator to take timely measures. The operation interface is shown in Figure 1.

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