Abstract: the design of intelligent open channel flow meter
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Open channel flow meter is in the full tube measurement nature of free surface flow in open channel flow meters, are widely used in urban water supply channel, power plant cooling water diversion and drainage, sewage disposal flow and discharge of drainage, industrial and mining enterprises, wastewater discharge flow.
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Open channel flow meter is in the full tube measurement nature of free surface flow in open channel flow meters, are widely used in urban water supply channel, power plant cooling water diversion and drainage, sewage disposal into and discharge channel, industrial and mining enterprises, wastewater discharge flow measurement.
Therefore, developing a low cost, high precision, convenient operation, simple structure of the open channel flow meter for rational utilization of water resources, sewage treatment has important practical significance.
Flow meter based on MCU C8051F060 as main control chip design in this paper, using its capture the characteristics of pulse width measurement, realize the velocity signal acquisition and processing.
System can measure the liquid level, flow velocity and flow rate at the same time, and the data on the LCD screen display;
Through the RS -
232 serial communication interface with PC;
External usb drive, to achieve mass type storage;
Accurate real-time clock display;
Nonvolatile data security storage, etc.
1 measurement principle of this design adopts the method of flow measurement for & other;
Throughout & calculation method of water level;
A local, measured flow channels (
Points, lines or small size)
Velocity, represents the average flow velocity;
Circulation area obtained by measuring water level again, and from the relations between local velocity and average velocity of the calculus to calculate the flow.
Velocity measurement is adopted propeller type velocity sensor, first of all port test section of the velocity sensor of propeller speed test circuit, signals from velocity sensor is by mechanical contact or contact a reed relay of open and close signal, the signal is sent to detect transform for signal conversion circuit, and after filtering, to shake the transformation to the pulse signal, into the MCU I/O port.
Within a certain range, speed and propeller velocity exist the following linear relationship: (
Type: & upsilon;
For measuring point velocity;
N for the current meter propeller speed;
K for the current meter proportionality constant or hydraulic pitch;
C for current meter zui small induction velocity;
T used for measuring rotating weeks time.
N T propeller rotation weeks for a set period of time.
So, in a certain time, as long as measure the rotation of the propeller weeks, can find out the position of the propeller of the instantaneous velocity value.
Then, cross section of the test, the flow velocity and flow area integral at various points can be obtained by the traffic.
2 circuit design of the portable intelligent open channel flow meter based on MCU C8051F060 as the core, through the sensor to measure the rotation of the propeller in weeks, the flow velocity and flow rate is calculated, and through the liquid crystal display real-time display;
Calculations required parameters, such as: hydraulic pitch coefficient, slip, drag coefficient of the instrument, measurement section, through a small keyboard set in advance.
In addition, the system also has the U disk read and write function, real time clock and serial nonvolatile data storage function, etc.
System block diagram is shown in figure 1.
Figure 1 system block diagram 2.
1 master control module system master control chip selects high integration MCU C8051F060 chips, the microcontroller is fully integrated mixed signal SoC (system on
, with MCS
51 kernel and instruction set is fully compatible with microcontrollers, besides has the standard 8051 digital peripheral components, has integrated the data acquisition and control system on chip that is commonly used in simulating parts and other digital peripherals and feature.
2 signal acquisition module velocity signal acquisition is a propeller type current sensor.
Propeller type velocity sensor of the rotors turn every five forwards a signal, the signal as pulse signal, the capture function of C8051F060, measure pulse cycle, can calculate the current velocity.
Propeller type velocity sensor signals through high speed photoelectric coupler 6 n136 into C8051F060 T4EX side, T4 end to capture mode, T3 to square wave output mode, T3EX grounding, make the T3 the decrement count, T3 and T4 are linked together, after 10 k & Omega;
When T4EX receives the signal for the falling edge, T4 capture interrupt, through EXF4 queries.
When T4EX received signal pulse width is longer, the T4 overflow, at this time, there was no capture, in the heart of the interrupt overflow flag bit 0, overflow number plus 1, record the number of overflow, according to the number of overflow and RCAP4 value calculation of a pulse cycle, all the cycle time accumulative total time, using the data from the formula in flow velocity can be obtained.
Water level signal acquisition is mike pressure sensor is used to realize.
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