About the function and effect of developing the intelligent detection and control system of metal tube float flow meter

Abstract: Information on the function and effect of the development of the intelligent detection and control system of the metal tube float flow meter is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Float flowmeter, also known as rotameter, is a classic variable-area flowmeter. It is a volume flow based on the volumetric flow that the float moves up and down with the flow change in the vertical conical tube, and changes the area of ​​the circulation annulus formed between them as the basis for flow measurement. meter. because of its structure. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on the function and effect of the intelligent detection and control system for the development of metal tube float flowmeters. Float flowmeter, also known as rotameter, is a classic variable-area flowmeter. It is a volume flow based on the volumetric flow that the float moves up and down with the flow change in the vertical conical tube, and changes the area of ​​the circulation annulus formed between them as the basis for flow measurement. meter. Because of its simple structure, reliable operation, small and stable pressure loss, and the ability to measure low-speed flow media, it has been widely used in gas and liquid flow measurement and automatic control systems. At present, most of the market of rotameter in my country is occupied by imported and joint venture products, and the technology of rotameter in China generally stays at a low level, especially in key indicators such as accuracy and range, there is still a gap with foreign countries. This research innovates the detection and control system of the traditional rotameter, and develops an intelligent detection and control system for the metal tube rotameter. 1. Overview of metal tube rotameter According to the different manufacturing materials of its conical tube, the rotameter can be divided into three types: glass tube, plastic tube and metal tube. Compared with glass tube and plastic tube, metal tube rotameter has no risk of breakage of tapered tube, has a wider range of operating temperature and pressure, and also has the signal remote transmission function that glass tube and plastic tube rotameter does not have, so it is suitable for wider. According to the different ways of signal transmission, the metal tube rotameter is divided into local indication type and remote transmission type. The local indication type directly indicates the flow through the pointer. The remote transmission type is divided into gas remote transmission and electric remote transmission. The characteristics of the gas remote rotameter are similar to the electric remote rotameter, except that the remote transmission signal is an air pressure signal of 0.02~0.1MPa. At present, the signal remote transmission method is still mainly electric remote transmission. The most commonly used electric remote transmission metal tube rotameter is based on the local indication type, and then drives the differential transformer or angle sensor through a specific mechanical structure. , convert the position signal of the float into the angular displacement of the iron core of the differential transformer or the angular displacement sensor, etc., and then convert it into a standard current and voltage signal output. In industrial production, metal tube rotameter is mainly used for flow measurement of high temperature, high pressure medium and other various medium conditions under complex and harsh environmental conditions. In addition to being used for industrial raw material proportioning measurement, it can also transmit standard signals for process control, flow detection, or be used directly with recorders and displays to measure cumulative flow, etc. 2. Hardware structure of intelligent detection control system Metal tube float flowmeter can measure the flow of gas and liquid. In the detection and control system of the metal tube float gas flowmeter, data such as temperature, pressure and flow rate have high precision requirements, and require stable working conditions, high reliability and friendly man-machine interface. Therefore, in the development of this system, the hardware system of Advantech industrial computer IPC610 series is combined with KingView application software platform to form an intelligent detection control system, which realizes real-time data acquisition and control. The system hardware structure is shown in Figure 1. Advantech IPC-610 adopts 19" Ruggedized 4U rackmount chassis with 14-slot passive backplane or industrial-grade motherboard, shock-resistant disk drive bays for three 5.25" and 1 3.5"Disk drives, 2 USB and PS/2 keyboard I/O ports on the front, system status LEDs on the front panel of the chassis to show power, hard drive and system voltage operation, two filtered cooling fans throughout the chassis Maintain positive air circulation inside. Due to the above features, IPC-610 has strong anti-interference, dust-proof, shock-proof and anti-turbulence capabilities, and is widely used in industrial control systems in harsh environments. The host of this system uses Advantech IPC610P4, including the main board, various input modules and RS-485 communication modules. Different functional intelligent units composed of various types of sensors (temperature, pressure, flow pulse), display control function module, measurement control module, analog input interface, digital input interface and RS-485 communication interface, communicate with the host computer. Interaction, unified coordination, command and processing tasks by the industrial computer CPU. The system structure not only meets the measurement and control requirements of various analog and digital quantities, but also adopts RS-485 communication mode, which has the characteristics of long transmission distance, large data capacity and strong anti-interference ability, which can solve the problem of high power in the system. equipment may cause interference, thus ensuring the accuracy requirements of the entire system. The metal tube rotameter can be used for the measurement of higher pressure gas and high pressure liquid whose temperature exceeds the boiling point, but requires that the working pressure and temperature of the measured fluid should be lower than the rated value specified by the instrument. When the fluid temperature is high, its rated pressure must be reduced.

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