Software Design of New Coriolis Mass Flow Meter

Abstract: The software design information of the new Coriolis mass flow meter is provided by the excellent flow meter and flow meter production and quotation manufacturers. Abstract: This paper elaborates the design and realization of a new Coriolis mass flowmeter software part for measuring fluid velocity, density and flow. The key technologies (density, flow formula) and difficulties (the conversion of floating-point numbers to ECD codes) are detailed. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the software design article details of the new Coriolis mass flowmeter. This paper elaborates the design and realization of a new Coriolis mass flowmeter software part for measuring fluid velocity, density and flow. The key technologies (density, flow formula) and difficulties (the conversion of floating point numbers to ECD codes) are explained in detail. Foreword Coriolis mass flowmeter is a direct high-precision automatic instrument made by using the principle that the Derioli force experienced by the fluid passing through the vibrating pipeline is proportional to the fluid mass. It is widely used in the process industry, such as the measurement of oil, chemical, pharmaceutical, food and other media. Compared with other measurement products, the Derioli mass flowmeter has three advantages: (a) It does not require pressure correction; ( b) It integrates measurement of flow, temperature and density; (c) There are no moving parts inside, so even if the lubricating performance of the medium is poor, the reading will not be affected. In order to improve the measurement accuracy of the Coriolis mass flowmeter, we developed a new generation of U-shaped double-tube Coriolis mass flowmeter by using PLD devices, and used the counting method to process the two-way signal and temperature signal obtained by the detection tube. . Compared with similar products, the system realized by this method has the characteristics of small size, low power consumption, strong function, high precision and strong adaptability. This paper mainly introduces the system structure of this new Coriolis mass flowmeter, the software and hardware Implementation and key technologies and difficulties. The main parts of a typical CMF sensor are the flow tube, the drive coil detector and the thermistor that measures the temperature. Among them, the flow tube has U-shaped, straight tube and other shapes. We adopted a U-shaped double-pipe type. The flow tube vibrates at its natural frequency, and when the fluid passes through the sensor, which vibrates at the natural frequency, Coriolis forces are created. Two detectors located on the inflow side and the outflow side of the flow tube can detect two vibration signals with the same frequency but with a phase difference. The phase difference is proportional to the instantaneous flow. When the flow rate increases, the time difference (equivalent to the phase difference) of the signals of the two detectors increases. The vibration signal period is closely related to the fluid density, the greater the fluid density, the greater the vibration period. Therefore, by processing the phase difference and period of the two signals, the flow velocity and density of the fluid can be obtained. The entire Coriolis mass flow meter system structure utilizing PLD technology is shown in Figure 1. The original phase difference, period, temperature and other signals need to be digitized before further processing. The two sinusoidal signals with phase difference generated by the detection tube are processed by the analog part to generate two square wave signals with the same period and phase difference, which are sent to the data acquisition unit together with the temperature signal generated by the temperature sensor. Here, they are digitized and sampled, frame-encoded, and stored in the FIFO. The single-chip microcomputer is responsible for data processing, and the PLD module is responsible for the synchronization of the entire system and the generation of various control signals. While measuring the flow, the system calculates the density of the flowing medium in the pipe by measuring the natural frequency of the vibrating pipe, and displays it. The system adopts a character dot-matrix LCD display to display parameters such as instantaneous flow, medium density, time, and medium temperature. When the system loses power unexpectedly, the watchdog is used to notify the microcontroller in time, and the system parameters are quickly saved to the EEPROM, so that the historical data measured at the next startup can be fully utilized. The system can perform serial asynchronous communication with the host, and transmit data to the PC host at any time. The software design of the software design part of the system adopts a modular structure, which consists of the main program and subprograms (including interrupt service routines). Among them, the system initialization is completed and the interrupt is turned off, the serial communication baud rate is set, the liquid crystal display is cleared, and the necessary characters to prompt the user (such as LIULIANG, US, etc.) are displayed. According to the needs of users, there are often more than one function button, so the interrupt source needs to be expanded. In the service program in the button, first determine which button caused the interrupt, and then enter the corresponding service program. In the FIFO interrupt service routine, the frame data in the FIFO is taken out first, and then stored in the corresponding RAM address unit. When the program returns from the FIFO interrupt service routine, it processes the decoded data of the frame, which mainly includes calculating the density of the fluid from the phase, period, and temperature data according to the density formula and the flow rate formula, and the mass of the fluid in a certain period of time. . The serial communication part with the host, where the communication baud rate,Parity checking is done through the Kermite protocol.

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