Design of Intelligent Open Channel Flow Meter

Abstract: The design information of the intelligent open channel flow meter is provided by the excellent flow meter and flow meter production and quotation manufacturers. Open channel flowmeter is a flow meter that measures free surface natural flow in a non-full tubular open channel. It is widely used in urban water supply diversion channels, thermal power plant cooling water diversion and drainage channels, sewage treatment inflow and discharge channels, and industrial and mining enterprises. Wastewater discharge and other flows of. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the design article details of smart open channel flowmeters. Open channel flowmeter is a flow meter that measures free surface natural flow in a non-full tubular open channel. It is widely used in urban water supply diversion channels, thermal power plant cooling water diversion and drainage channels, sewage treatment inflow and discharge channels, and industrial and mining enterprises. Wastewater discharge and other flows Measurement. Therefore, the development of an open channel flowmeter with low cost, high precision, convenient operation and simple structure has important practical significance for rational utilization of water resources and sewage treatment. The flowmeter designed in this paper is based on the single-chip microcomputer C8051F060 as the main control chip, and uses its characteristics of capturing and measuring the pulse width to realize the acquisition and processing of the flow rate signal. The system can simultaneously measure liquid level, flow rate, and flow, and display the data on the LCD screen; serial communication with the host computer through the RS-232 interface; external U disk to achieve mass storage; accurate real-time clock display; Loss of safety storage and other characteristics. 1 Measurement principle The flow measurement method used in this design is“Velocity-Water Level Calculation Method”, measure the flow velocity of a certain part (point, line or small area) of the flow channel, which represents the average flow velocity; then measure the water level to obtain the flow area, and calculate the flow rate from the relationship between the local flow velocity and the average flow velocity. The flow velocity is measured by using a propeller flow velocity sensor. First, the rotational speed of the propeller of the flow velocity sensor on the test section of the flow channel is inspected. The signal obtained from the flow velocity sensor is an opening generated by a mechanical contact or a dry reed relay contact. , Combined signal, the signal is sent to the detection conversion circuit and converted into an electrical signal, and after filtering and de-jittering, it is converted into a pulse signal and sent to the I/O port of the single-chip microcomputer. Within a certain range, the rotational speed of the propeller and the flow velocity have the following linear relationship: (1) In the formula:υis the flow velocity at the measuring point; n is the rotating speed of the propeller of the flow meter; K is the proportional constant of the flow meter or hydraulic pitch; C is the minimum induced flow rate of the flow meter; T is the time used to measure the number of revolutions; The number of revolutions of the paddle. Therefore, in a certain period of time, as long as the number of revolutions of the propeller is measured, the instantaneous flow velocity value at the position of the propeller can be obtained. Then, the flow velocity and flow area at each point of the test section are integrated to obtain the flow rate. 2 Circuit design Portable intelligent open channel flowmeter is based on the single chip C8051F060 as the core. The number of revolutions of the propeller is measured by the sensor, the flow rate and flow rate are calculated and displayed in real time through the liquid crystal display; the parameters required for calculation, such as hydraulic pitch Coefficient, slip rate, instrument resistance coefficient, measurement section are preset through the keypad. In addition, the whole system also has U disk read and write functions, real-time clock and serial non-volatile data storage functions. The system block diagram is shown in Figure 1. Figure 1 System block diagram 2.1 System main control module The system main control chip adopts the highly integrated MCU chip C8051F060, which is a fully integrated mixed-signal system-on-chip SoC (Systemonchip), with a microcontroller that is fully compatible with the MCS-51 kernel and instruction set In addition to the standard 8051 digital peripheral components, the chip also integrates analog components and other digital peripherals and functional components commonly used in data acquisition and control systems. 2.2 Signal acquisition module Flow velocity signal acquisition is realized by propeller-type flow velocity sensor. The propeller of the propeller velocity sensor transmits a signal every five revolutions, which is a pulse signal. Using the capture function of the C8051F060, the pulse period can be measured, and the current velocity can be calculated. The signal from the propeller-type flow velocity sensor is sent to the T4EX terminal of the C8051F060 through the high-speed photocoupler 6N136. The T4 terminal is set to capture mode, T3 is set to the square wave output mode, and T3EX is grounded to make T3 count down, and T3 is connected to T4. pick up 10kΩPull-up resistor. When the signal received by T4EX is a falling edge, T4 generates a capture interrupt, which is queried by EXF4. When the pulse width of the signal received by T4EX is long, T4 overflows, and no capture occurs at this time. In the interrupt, the overflow flag is cleared to 0, the overflow times are increased by 1, the overflow times are recorded, and a pulse is calculated according to the overflow times and the value of RCAP4. The total time is obtained by accumulating all cycle times, and the flow rate can be obtained by substituting the data into the formula. The water level signal acquisition is realized by using the microphone pressure sensor. 2.3 The serial interface module system communicates with the PC through the RS-232 interface. The main control chip C8051F060 is powered by a 3.3V power supply, so ADM202 is selected as the RS-232 level conversion chip, and the power supply voltage of this chip is 3.0V~5.5V. The measurement of the water level signal adopts a microphone pressure sensor, which converts the water level into a 485 signal and sends it to the microcontroller. Therefore, the single-chip microcomputer needs to convert the 485 level before communicating with the microphone pressure sensor. The system selects the SN65LBC184 level conversion chip, and selects the high-speed optocoupler 6N136 in the RS-485 interface circuit to prevent external signals from interfering with the system.

Looking for an innovative range of tuning fork liquid density meter mass flow meter products? Beijing Sincerity Automatic Equipment Co., Ltd supplies a diverse range of consumer, commercial and specialty industrial products including mass flow meter, rosemount vortex flow meter, low flow turbine flow meter,etc.Click Sincerity Flow Meter to learn more!

All you women out there looking for amazing to dazzle the world try Beijing Sincerity Automatic Equipment Co., Ltd latest collections at Sincerity Flow Meter. Try it!

mass flow meter is attracting a great positive feedback from the customers. And many of our clients are fully satisfied with it.

This can benefit Sincerity by helping it target those investors and consumers who are specifically interested in its type of product or service.

We create a group of experts to promote the quality standard and innovative technology of mass flow meter.