Measurement method of orifice flow meter

Abstract: The measurement method information of the orifice flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. 1. Natural gas flow measurement method my country's natural gas measurement is usually expressed in volume, and the legal unit is cubic meters. my country stipulates that the standard state of natural gas flow measurement is: the absolute pressure is 0.101325MPa, and the temperature is 23.15℃. There are many ways to measure natural gas flow. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the measurement method of the orifice flowmeter. 1 Natural gas flow measurement method my country's natural gas measurement is usually expressed in volume, and the legal unit is cubic meters. my country stipulates that the standard state of natural gas flow measurement is: the absolute pressure is 0.101325MPa, and the temperature is 23.15℃. There are many natural gas flow measurement methods, and there are many flow meters available. According to the working principle, they are roughly divided into three types: differential pressure flowmeter, positive displacement flowmeter, and velocity flowmeter. In terms of measurement standards, at present, most national measurement standards in the world are gradually moving closer to IS05167 'Measuring the flow of fluids filled with circular tubes with orifices', and my country's natural gas measurement standards have also been revised to SY/T6143-1996 'Standard orifice measurement of natural gas flow' method'. 2 Overview of automatic measurement of orifice flowmeter The so-called automatic measurement is to use the transmitter to detect the temperature, pressure, pressure difference and other parameters involved in the measurement of natural gas flow in real time. Through the flow calculation software in the computer, the whole flow measurement process is realized. Natural gas flow measurement without human involvement. With the development of measurement technology and the popularization of computer use. There are many schemes to realize the automatic measurement of orifice flowmeter. At present, there are mainly the following four modes. 2.1 Single-variable transmitter flow computer (or industrial computer) uses single-variable analog transmitter to detect temperature, pressure and differential pressure respectively, and convert the detected electrical signal into a standard 4-20MA analog signal and send it to the flow computer ( or industrial computer) data acquisition card, convert it into digital quantity through A/D, and calculate the instantaneous flow, cumulative flow and other auxiliary functions of natural gas through flow calculation software on the flow computer (or industrial computer). This method is a traditional automatic metering mode. The disadvantage is that the acquisition and transmission are analog signals, and the anti-interference ability is poor. Due to problems such as signal conversion, it is difficult to improve the measurement accuracy, and the hardware is complex, there are many intermediate links, and the reliability is poor. It can be expanded to: single-variable transmitter, flow computer, industrial computer, so as to realize the separation of flow calculation and display, and improve the reliability and visibility of the system. 2.2 Multi-variable transmitter flow computer (or industrial computer) uses a multi-variable intelligent transmitter to simultaneously detect temperature, pressure, differential pressure, etc. ) After the data acquisition card, the instantaneous flow of natural gas, the cumulative flow and other functions are calculated through the flow calculation software. In this way, the hardware connection is simplified a lot, and the reliability and measurement accuracy of the system are improved. However, since the transmitter only detects the measurement signal and does not process data, it must be calibrated together with the flow computer during calibration. The main difference between using a flow computer or an industrial computer is the flow calculation part. The flow computer is a special firmware to realize calculation and data storage, which is relatively stable and reliable, and has a high degree of trust; the software calculation on the industrial computer is generally developed independently, which is convenient for software upgrade and system maintenance. Due to the large amount of calculation, especially when multi-channel metering, Reliability is slightly worse. In order to increase the reliability of the system and the intuitive operation interface, this method can also be extended to: multivariable transmitter, flow computer, industrial computer, that is, the flow calculation is realized in the flow computer, and the display is realized on the industrial computer. 2.3 Multi-variable intelligent transmitter industrial computer Compared with mode 2, the main difference is that the flow processing software is solidified in the transmitter, so that the transmitter can display the instantaneous measurement parameters and calculate the instantaneous flow on the spot, and transmit it through digital signals , sent to the industrial computer to display and realize other input functions. The measured flow value must be processed twice on the industrial computer to realize the function of data accumulation and storage. In this way, the system structure is further simplified, and the transmitters can be calibrated individually or jointly, which is easy to maintain. However, due to the accumulation and storage of traffic in the industrial computer, the reliability is poor, and it is easy to cause data loss. 2.4 Integrated intelligent instrument The industrial computer mainly uses the integrated intelligent instrument to realize the integration of the transmitter and the flow computer.

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