The instruments and equipment of liquid level meter using viscous medium are collectively referred to as ultrasonic flowmeter. In electric power engineering, water conservancy engineering, chemical plant, crude oil, light industry, power supply and other units, there is Ge Guang: the application of the certificate, which has no theme active magnetic induction component, does not damage the body potential flow, does not have the pot property of mechanical equipment, rapid response of Tsui transformer, strong dynamic measurement ability, installation and convenient use, and is convenient to maintain automation technology and network management.

At present, there are many products of ultrasonic flowmeter in the world, but most of them are point injection measurement. That is to say, each instrument only measures the flow rate and flow rate of a target. When it is necessary to measure several targets or several parts of the fluid, it is necessary to configure several flow meters, which will inevitably lead to the increase of the cost of measuring machinery and equipment. By combining the technology of electronic computer control with the technology of fluid injection measurement, a set of software of time-dependent ultrasonic flowmeter controlled by computer system is designed. The control system has novel design concept, high accuracy of weight measurement, strong anti-interference ability, and convenient installation. It is a selective machine and equipment for measuring the flow rate and flow of fluid in channels, dark channels or filtering operations in water conservancy projects, electric power projects, environmental protection power supply, drainage pipelines and common sewage treatment, etc. the county has a general application prospect.

Software composition and key function of time difference ultrasonic flowmeter system controlled by computer system

The system software consists of a PC and several flow transmitters. Each viscous medium liquid level measurement transformer is installed in a separate mainframe box, equipped with four ultrasonic transducers, which are connected with the PC according to the serial communication port. Each PC can connect up to 8 flow transmitters according to the communication expansion socket, and measure the fluid velocity and flow weight of eight targets or 32 different parts of the same target. Because the intelligent transmitter and CPU are connected according to RS-232 interface, it is necessary to lift the wireless viscous medium on the communication optical cable to ensure the proper transmission of information content.

(1) The function of PC: in the whole work of intelligent management system and in the work of keeping all flow transmitters operated by man-machine exchange, it is possible to carry out the measurement of the measured flow rate, and carry out the measurement of rotation and tax, the input and output of intelligent management system, and the operation of system pairs. Function of each part of the system

(2) The function of the flow transmitter is to drive the ultrasonic transducer of the sound path and water level line, solve the received data signal, measure the single pulse spread time of the specific sound path, and report the measurement results to the PC. The software of the ultrasonic flowmeter system controlled by the computer system is used to measure the velocity and flow rate of the flow body in the closed pipeline or open buckle of various shapes. The scope of measured commodity flow is 0.3m-15m: Zui is small to ensure that the precision flow rate is 0.3m/s; the measurement deviation of the system software for the flow of fluid in the national pipeline (fluid filling) is less than 0.5%, and the measurement deviation for the flow of fluid in the irrigation canal and other complicated pipelines is not more than 1.5%, It is a flow measurement system software with high accuracy and strong anti-interference ability, and has a general application prospect.