KR200441313Y1 - Device for controlling of flow measuring unit - Google Patents

Abstract

The control device of the flowmeter includes at least one coil mounted at a predetermined position of the tube through which the fluid passes, at least one electrode mounted at a predetermined position different from the coil of the tube, and multiple frequencies, A controller for selecting a measurement frequency and a power source, generating a square wave according to the selected measurement frequency, analyzing and processing the detected measurement signal, and generating a sensor control signal and a sensor power control signal for controlling the sensor at a set time; A power conversion unit for generating a power selected by the power supply, a coil driving unit alternately switched by a square wave to apply measurement power to the coil, a detection unit for detecting electromotive force induced by the sensor, and output from the power supply unit by a sensor control signal A sensor control unit which alternately switches the sensor power to remove the coating of the sensor, and a flow side processed under the control of the control unit It consists of a display unit for displaying data.

Flow measurement, flow detection, sensor control,

Description

DEVICE FOR CONTROLLING OF FLOW MEASURING UNIT}

The present invention relates to a control device of the flow meter, and more particularly to a device that can automatically control the operation of the flow meter.

In general, the flow meter refers to a device for measuring the flow rate, pressure or velocity of the fluid flowing in the tube.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the flow measurement principle of an electromagnetic flow meter.

Referring to FIG. 1, when a magnetic field generating coil 180 is mounted in a closed pipeline 10 and a measurement waveform is applied to the coil 180, a magnetic field is generated in the pipeline 10 to form a magnetic field. At this time, the fluid passing through the magnetic field may have a conductivity of the fluid-specific characteristics. Therefore, if the magnetic flux is interrupted when the fluid flows in the magnetic field, a voltage proportional to the velocity of the fluid may be obtained at the electrode 190 disposed at a different position from the coil 180 on the conduit. This can be defined by Faraday's law. Therefore, the flow rate meter can measure the flow rate of the fluid flowing in the pipeline by the Faraday law as described above.

In this case, the voltage induced in the electrode 190 may be expressed as in Equation 1 below.

E = K · B · d · V

In Equation 1, E may be an electromotive force, K may be a proportional constant, B may be a magnetic flux density, d may be an inner diameter of a tube, and V may be an average velocity of a fluid. At this time, if the proportional constant K determined according to the type of the fluid and the inner diameter d and the magnetic flux density B of the tube are constant, it can be seen that the electromotive force E changes according to the speed V of the fluid. In this case, the integral of the strength of the electromotive force E in the required time unit may be a flow rate.

The electromagnetic flowmeter using the above-described measurement method may use different measurement waveforms depending on the type of fluid to be measured. This may absorb energy of a specific waveform depending on the type of fluid flowing in the conduit, in which case an error in flow measurement may occur. For example, certain fluids may have the property of absorbing certain frequencies, and when measuring the flow rate of such fluids, the absorbed frequency should not be used as the measurement frequency. Thus, the electromagnetic flow meter preferably uses multiple frequencies instead of a fixed frequency to generate the measurement waveform.

In the case of the flow rate meter using the multiple frequencies as described above, it is necessary to change the type of fluid to be measured or to change the measurement frequency in the operating state. In this case, the user must stop the flow meter to end the flow measurement of the fluid currently being measured, set a new measurement frequency, and set the flow meter operation by the new measurement frequency. After the setting of the flow meter is finished, the user can operate the flow meter to measure the flow rate with the newly set function. Therefore, the conventional flow meter has a problem that the flow measurement operation is interrupted while setting a new function. Therefore, even if it is desired to change the flow meter to another function, it is desirable to perform continuous flow measurement without interrupting the flow measurement.

In addition, a film is formed inside the flow meter through which the fluid is passed by the fluid of the flow meter. In particular, when the type of the fluid to be measured includes sludge, such as waste water, the flowmeter can be formed quickly unnecessary film. In this case, when the coating is formed on an electrical element for measuring the flow rate, such as an electrode of the flow meter, an error and a malfunction of the flow rate measurement may be caused. Therefore, it is desirable to automatically remove the film formed on the flow meter so that the flow rate measurement can be performed accurately.

The flow meter according to the embodiment of the present invention generates a multi-frequency capable of measuring the types of the fluid to be measured, and by using the multi-frequency to generate a measurement waveform suitable for the type of the fluid to be measured to measure the flow rate Perform efficiently. Also, when the function is changed while the flow meter is in operation, the measurement frequency of the target to be changed is changed while maintaining the flow measurement function of the currently set fluid, and the measurement function is maintained even while the measurement frequency is changed. After the change of the measurement frequency is completed, the measurement of the flow rate is started using the changed measurement frequency, thereby maintaining the flow measurement function continuously while the measurement frequency is changed. In addition, the flow meter removes the coating coating phenomenon formed by the fluid by applying an alternating voltage to the electrode at regular intervals. In this case, the applied alternating voltage may improve the reliability of the flow rate measurement by removing the coating that may be formed on the electrical devices measuring the fluid at a minute voltage.

The flow meter according to the embodiment of the present invention improves the flow measurement characteristics by setting the measurement frequency having a good flow measurement characteristics according to the type of the fluid to be measured by using the multi-frequency. In addition, the flow meter of the present invention maintains the measurement state even when the function is changed when the measurement function is changed, so that the flow rate measurement of the fluid can be continuously performed. In addition, the flow meter of the present invention removes the coating coating phenomenon formed in the flow meter by applying an alternating voltage to the flow meter at regular intervals.

The control device of the flow meter according to the embodiment of the present invention, at least one coil mounted at a predetermined position of the tube through which the fluid is passed, at least one electrode mounted at a predetermined position different from the coil of the tube, multiple A sensor control signal for selecting a measurement frequency and power according to the measurement fluid, generating a square wave according to the selected measurement frequency, analyzing and processing the detected measurement signal, and controlling the sensor at a set time; A control unit for generating a sensor power control signal, a power conversion unit for generating power selected by the control unit, a coil driving unit alternately switched by the square wave to apply the measurement power to the coil, and inductive to the sensor. Alternately switching the detection unit for detecting the electromotive force and the sensor power output from the power supply unit by the sensor control signal And removing the coating film of the standing sensor controller, characterized by consisting of a display for displaying the flow measurement data the processing under the control of the controller.

In another aspect, the present invention is a control device of the flow meter, at least one coil mounted at a predetermined position of the tube through which the fluid is passed, at least one electrode mounted at a predetermined position different from the coil of the tube, and multi-frequency A sensor control signal and a sensor power source for selecting a measurement frequency and power according to the measurement fluid, generating a square wave according to the selected measurement frequency, analyzing and processing the detected measurement signal, and controlling the sensor at a set time; A control unit for generating a control signal, a power conversion unit for generating the power selected by the control unit, a coil drive unit which is alternately switched by the square wave to apply the measurement power to the coil, and electromotive force induced by the sensor. The detection unit for detecting and switching the sensor power output from the power supply unit by the sensor control signal alternately And a display unit for displaying the processed flow measurement data under the control of the control unit.

In another aspect, the present invention includes a memory for storing the measurement frequency data according to the fluid type, the control unit provides a control device of the flow meter for generating the square wave by checking the type of the measurement fluid according to the user's selection.

In addition, the present invention is composed of at least two sensors, the sensor control unit includes at least two switching elements, the switching device is driven by the sensor control signal of the alternating switching control signal to control the coating film coating It provides a control device.

In addition, the present invention further includes a key input unit, and when the measurement mode change is required by the user's selection, the control unit sets the change measurement mode information according to the user's input while maintaining the measurement mode of the currently set fluid, Provided is a control device of a flow meter for changing the measurement mode upon completion of the setting.

In another aspect, the present invention is mounted so that the display unit is rotated at a set angle, and provides a control device of the flow meter is rotated according to the user's setting.

In another aspect, the present invention is a square wave generator for generating the measurement frequency as a square wave, a digital converter for converting the detected measurement signal into digital data, and when the detected measurement signal is less than or equal to a set value, the square wave is changed. It provides a control device of the flow meter consisting of a square wave changer.

In another aspect, the present invention provides a control device of the flow rate meter further comprises a square wave rewinder for the control unit to add or subtract the frequency of the generated square wave at a set ratio.

In addition, the present invention is composed of two coils, the coil driver is composed of a divider for dividing the square wave at a predetermined division ratio, a buffer for buffering the divided square wave, and at least two switching elements, The switching element is connected between the first driving power source and the second driving power source generated in the power conversion unit, the switching element is alternately switched by the divided square wave to the first coil to the second coil, and the Provided is a control device for a flow meter, comprising a driver for forming a current path from the second coil to the first coil to generate magnetic lines of force in the tube.

In another aspect, the present invention provides a control device of the flow meter further comprising a communication unit for transmitting the measured flow rate data to an external device under the control of the controller.

In another aspect, the present invention provides a control device for a flow meter consisting of an amplifier for amplifying the electromotive force detected by the sensor and a waveform shaper for waveform shaping the amplified detection signal.

The control device of the flow meter according to the embodiment of the present invention can select and use the measurement frequency that can measure the fluid measured by the flow meter most effectively using multiple frequencies, thereby improving the measurement efficiency of the flow meter. Can be. In addition, when absorbing a specific frequency in the fluid to be measured, it is possible to control the measurement waveform and change it to a measurement frequency that is not affected by the fluid. There is an effect that can eliminate the noise that can be generated. In addition, the flow rate detector according to the embodiment of the present invention can remove the film coating phenomenon accumulated on the sensor by applying a minute alternating voltage to the sensor can accurately measure the flow rate.

In addition, the control device of the flow meter according to the present invention changes the measurement mode while maintaining the current measurement mode even when changing to another measurement mode or any other mode while performing the measurement mode at the detector. By completing the changed measurement mode, the flow measurement mode can be changed without interrupting the measurement mode.

Hereinafter, a detailed description of preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the same components in the figures represent the same numerals wherever possible.

In the following description, specific details such as specific examples such as flow measurement voltage, data logging, communication method, and the like are shown to provide a more general understanding of the present invention. It will be apparent to those skilled in the art that the present invention may be readily implemented without these specific details and also by their modifications.

In the embodiment of the present invention, the term "multi-frequency" means a plurality of frequencies that can be selected according to the tube diameter and the type of fluid, and the term "measuring frequency" is a frequency selected by the tube diameter and the fluid type of the flow meter. Means. The term "sensor control" means to remove the film coating phenomenon of the sensor measuring the flow rate. The term "alternative voltage" refers to a voltage generated by converting from anode to cathode or from cathode to anode as a voltage for controlling coils and sensors.

The flow meter according to the embodiment of the present invention can automatically determine the optimum frequency by the variable multi-frequency (variable multi-frequency) can be measured accurately. In addition, the flow meter according to the embodiment of the present invention by applying a minute + /-alternating voltage to the sensor at regular intervals, to eliminate the coating coating phenomenon of the electrode by the fluid, so as not to reduce the measurement sensitivity even for a long time use. In addition, the flow meter according to the embodiment of the present invention includes a real time control program of a real time operating system (real time O / S), so that the flow rate can be measured while changing the measurement function, that is, during key operation. And the graphic LCD can be used to display the hourly flow rate graphically.

2 is a view showing the configuration of a flow meter according to an embodiment of the present invention.

Referring to FIG. 2, the coil 180 may be composed of a plurality of coils and may be installed at a predetermined position of a pipeline. The coil applies a magnetic field in the fluid flowing in the pipeline. In the embodiment of the present invention may be composed of two coils of the first coil 180a and the second coil 18b, it may be installed to face each other at a predetermined position of the pipeline.

The sensor 190 is installed at a predetermined position of the pipeline. In an embodiment of the present invention, it is assumed that the sensor 190 uses an electrode. The electrode 190 may be installed to face a position perpendicular to the coil 180, and may include two electrodes 190a and 190b of a negative electrode and a positive electrode. In the embodiment of the present invention, it is assumed that the electrodes 190a and 190b are installed at right angles (90 degrees) as shown in FIG. 2 between the coils 180a and 180b.

The memory 110 temporarily stores the operation program of the flow meter and data generated during program execution according to an embodiment of the present invention. The memory 110 may include a program for selecting a measurement frequency according to the type of fluid to be measured and the size of a pipe connected to the fluid meter.

The coil driver 120 drives the coils 180a and 180b with a driving power determined by the controller 100 by the square wave output from the controller 100. The coil driver 120 may include a divider 121, a buffer 123, and a driver 125. Looking at the operation of the coil driver 120, the divider 121 divides the square wave output from the controller 100 according to the set division ratio. Here, the division ratio performs a function of determining a supply cycle of the driving power applied to the coils 180a and 180b, and the division ratio may be set by an experiment. The buffer 122 performs a function of generating a pulse measuring the divided signal output from the divider 121. The driver 123 is switched by a measurement pulse output from the buffer 123 to generate an alternating measurement signal. The driver 123 may be configured of two or more transistors, and may be alternately activated by the measurement pulse to transfer a driving signal alternately to the coils 180a and 180b.

Then, the alternating measurement signals are applied to the coils 180a and 180B mounted on the closed pipe line 10, and thus the coils 180a and 180b generate a magnetic field in the pipe line 10 to form a magnetic field. At this time, the fluid passing through the magnetic field may have a conductivity of the fluid-specific characteristics. Therefore, when the fluid is interrupted when the fluid flows in the magnetic field, a voltage proportional to the velocity of the fluid is induced in the electrodes 190a and 190b disposed at positions different from the coils 180a and 18b on the conduit 10. This can be defined by Faraday's law. Therefore, the flow rate meter may measure the flow rate of the fluid flowing in the pipe by Faraday's law as shown in Equation (1).

Then, the detector 130 connected to the electrodes 190a and 190b detects the voltage induced by the electrodes 190a and 190b, shapes and amplifies the waveform, and applies the waveform to the controller 100. The detector 130 may include a first amplifier 131, a waveform shaper 133, and a second amplifier 135. Looking at the operation of the detector 130, when the magnetic force line is generated by the coils 180a and 180b, the magnetic force line generated by the fluid having a conductivity in the tube 10 is cut off, and thus electromotive force is induced to the electrodes 190a and 190b. Then, the first amplifier 131 connected to the electrodes 190a and 190b performs a function of amplifying the electromotive force induced in the electrodes 190a and 190b. The waveform shaper 133 detects and shapes the detected waveform amplified by the first amplifier 131. At this time, the waveform-shaped detection signal has a weak signal strength. Therefore, the second amplifier 135 performs the function of amplifying the waveform.

The controller 100 performs a function of generating a multi-frequency and a function of controlling a power unit (not shown) to control generation of an operating power of a desired size. The control unit 100 checks the measurement frequency according to the characteristics of the selected fluid and tube in the memory 110 when the fluid type to be measured in the flow meter and the size of the tube 10 are selected, and the square wave according to the identified measurement frequency. After generating a, determine the voltage for measuring the fluid, and outputs the generated square wave and the converted voltage to the coil driver 120. And after receiving the measurement signal detected by the detector 130 is digitally converted, it is analyzed and processed.

The control unit 100 may have a square wave generator, a square wave winding, a digital converter, and a square wave converter. Here, the square wave generator performs a function of generating the measured frequency selected by the user as a square wave. The square wave rewinder performs a function of adding and subtracting a frequency of the generated square wave to a set frequency. Here, it is assumed that the square wave adder decrements the frequency of the generated square wave by ± 1%-± 2%. The digital converter may perform a function of converting the measurement signal detected by the detector 130 into digital data. The square wave converter may perform a function of converting the square wave when the detected measurement signal is weak. The components included in the control unit 100 as described above may include all or some of them.

The sensor cleaner 140 generates the fine alternating voltage and applies the alternating voltage to the electrodes 190a and 190b. The sensor controller 140 generates a minute alternating voltage having a set magnitude at each set time period under the control of the controller 100 and applies it to the electrodes 190a and 190b. Then, the coating of the electrode 190a and 190b is removed by the fine alternating voltage. The electrodes 190a and 190b may be formed of a film due to a foreign material in the ground portion by waste water which is a fluid flowing in the tube 10. In this case, the sensor controller 140 generates an alternating voltage and removes the film by applying the generated alternating voltage to the ground portions of the electrodes 190a and 190b.

The display unit 150 displays the operation state of the flow meter and the setting state of the mode set in the registration mode under the control of the controller 100. The display unit may include a graphic display function, and may display an operation state of the flow meter in a graphic form. The display unit 150 may be configured as a liquid crystal display (LCD). The key input unit 160 detects a key input such as a numerical value change in various functions and setting functions of the flow meter and applies it to the controller 100.

The communicator 170 may perform a communication function between the flowmeter and an external device or a network. The communication unit 170 outputs the measured flow detection data through an external device or a network under the control of the control unit 100. The communication unit 170 may be configured as a wired and / or wireless communication unit. At this time, in the case of a wired communication unit, the communication unit 170 may be implemented by RS 232C method or RS485 multi drop method. In the case of a wireless communication unit, the communication unit 170 may be a wireless communication by CDMA or an Internet communication unit by LAN. In the short range wireless communication method, the communication unit 170 may use a Bluetooth, ZigBee, or UWB communication method.

In addition, the power conversion unit (not shown) supplies operating power to each part of the flow meter, and in particular, generates a set voltage according to the fluid type and the size of the tube 10 to be measured to the coils 180a and 190b under the control of the control unit 100. Applied to 180a and 180b.

3 is a view showing a detailed configuration of the control unit 100, the coil driving unit 120 and the detection unit 130 in the flow meter according to an embodiment of the present invention having the configuration as shown in FIG.

Referring to FIG. 3, the controller 100 checks a measurement frequency and a voltage selected according to the type of fluid, and generates a square wave according to the measurement frequency. In addition, by controlling a power conversion unit (not shown) to control to generate a set power according to the fluid to be measured. The square wave generated by the controller 100 and the power output from the power converter are applied to the driver 120. At this time, the power supply of the flow meter is generally fixed to one power source (eg, 24V), but in the embodiment of the present invention, various types of power source (eg, 20V-30V) can be generated. The reason for converting the power is that the strength of the magnetic force lines generated in the tube 10 by the coils 180a and 180b can be converted by the power source. Therefore, in the embodiment of the present invention, the power source and the measurement frequency according to the size of the tube 10 and the fluid characteristics to be measured in advance are stored in the memory 110, and the measurement corresponding to the type of the tube 10 and the measuring fluid when measuring A frequency and a power are selected and applied to the driver 120.

Then, the divider 121 of the driving unit 120 divides the square wave output from the control unit 100 at a set division ratio, and the divided square wave is buffered in the buffer 123. In this case, it is assumed that the division ratio is 8, and in this case, the divider 121 divides the input square wave into 8 divisions and outputs them. The divided square wave signal output from the buffer 123 is applied to the driver 125, and the PNP transistor Q1 and the NPN transistor Q2 of the driver 125 which perform different operations are alternately activated. In this case, the Vcc voltage applied to the transistor Q1 of the driver 125 may be driving power of the coils 180a and 180b generated by the power converter under the control of the controller 100. Accordingly, when the transistor Q1 is turned on, a current path of the ground GND is formed through the driving power supply Vcc, the transistor Q1, the second coil 180b, and the first coil 180a, and thus, the coils 180a and 180b in the tube 10 are formed. Magnetic lines of force are generated. In addition, when the transistor Q2 is turned on, a current path of the second driving power source -Vcc is formed through the ground Gnd, the first coil 180a, the second coil 180b, and the transistor Q2, and thus the tube is formed by the coils 180a and 180b. Magnetic lines of force are generated within 10.

When the above operation is repeated, magnetic lines of force are generated in the direction of the first coil 180a to the second coil 180b and in the direction of the first coil 180a to the second coil 180b. The magnetic force lines generated as described above are cut off by the fluid flowing in the tube 10, and in this case, electromotive force is induced to the electrodes 190a and 190b, and the direction is formed according to Fleming's right hand rule. In this case, the magnitudes of the electromotive force detected by the electrodes 190a and 190b are different according to the amount (flow rate) of the fluid.

As described above, the electromotive force induced in the electrodes 190a and 190b is amplified by the first amplifier 131, detected and shaped by the waveform shaper 133, amplified by the second amplifier 135, and applied to the controller 100. In this case, the first amplifier 131 may be set to have an amplification factor of 100 times.

Then, the controller 100 digitally converts the measurement signal detected by the detector 130 and processes it. At this time, the electromotive force induced in the electrodes 190a and 190b may vary in size depending on the type of the fluid to be measured. That is, when the electromotive force is absorbed by the fluid according to the type of the fluid to be induced in the electrodes 190a and 190b, the detector 130 may detect the measurement signal very weakly, which may cause a state in which the fluid cannot be measured. At this time, if it is detected that the measurement signal is weakly detected, the control unit 100 may change the square wave by controlling the square wave converter of the inner part. In this case, the changed square wave may be a frequency that is not absorbed by the fluid.

In addition, the control unit 100 may include a square wave adder that adds or subtracts a frequency at a ratio (± 1% to ± 2%) set around the square wave frequency generated by the square wave generator. That is, the frequency of the square wave applied to the coils 180a and 180b is added or subtracted to reduce noise generated when passing two or more fluids having different natural resonance frequencies (for example, when water suddenly passes through air). can do. This converts (decrements) the square wave frequency, and the coils 180a and 180b generate magnetic force lines by the converted square wave, and the control unit 100 is generated when two or more fluids pass through the tube 10. By averaging the electromotive force, it is possible to remove noise due to the passage of two fluids.

4 is a flowchart illustrating an operation procedure of a flow meter according to an embodiment of the present invention having the configuration as shown in FIGS. 2 and 3.

Referring to FIG. 4, the controller 100 may change an operation mode of the flow meter and a numerical value in the operation mode according to a user's command set by the key input unit 160. Therefore, when a random key input occurs in the key input unit 160, the control unit 100 detects this in step 211 and processes the registration function according to the corresponding key in step 213. In addition, the controller 100 performs an operation of removing the film coding accumulated in the ground portions of the electrodes 190a and 190b on a predetermined time basis. Therefore, when the set time is reached, the control unit 100 detects this in step 215 and removes the coating by applying a fine alternating voltage set to the electrodes 190a and 190b in step 217.

In the fluid measurement mode, the controller 100 determines the measurement frequency and the measurement power according to the selected fluid type. Accordingly, in the fluid measurement mode, the control unit 100 generates a square wave according to the selected measurement frequency in step 223, controls the power conversion unit to generate power corresponding to the type of the measurement fluid, and applies it to the driving unit 120. . In step 223, the control unit 100 converts the square wave by adding or subtracting a frequency of the generated square wave. That is, the controller 100 checks the measurement frequency according to the characteristics of the selected fluid and tube in the memory 110 when the fluid type and the size of the tube 10 to be measured in the flow meter are selected, Generate a square wave and convert the generated square wave. The reason for converting the square wave is to reduce noise generated when passing two or more fluids having different natural resonance frequencies (for example, when suddenly passing air through water) as described above. In this case, the square wave conversion process may be omitted. In addition, the controller 100 determines the voltage for measuring the fluid, and then outputs the generated square wave and the converted voltage to the coil driver 120.

Square wave and power generated to measure the fluid as described above is applied to the drive unit 120. Then, the driving unit 120 is alternately switched by the square wave to apply the power to the coils 180a and 180b, whereby the coils 180a and 180b generate magnetic lines in the tube 10. The magnetic force lines in the tube 10 are interrupted by the fluid flowing in the tube 10 and induced by electromotive force to the electrodes 190a and 190b. The electromotive force induced by the electrodes 190a and 190b is detected by the detector 130 and transferred to the controller 600.

In step 225, the control unit 100 receives the detected measurement signal and digitally converts it. In step 227, the controller 100 checks the intensity of the detected signal. In this case, if the detected intensity of the measured signal is smaller than the set size, the controller 600 detects it in step 229 and converts the square wave in step 231. In this case, the strength of the detected measurement signal is weak because the electromotive force is absorbed by the fluid according to the type of fluid only after being induced by the electrodes 190a and 190b. Therefore, when detecting that the measurement signal is weakly detected, the controller 100 changes the square wave to a frequency that is not absorbed by the fluid. However, if the detected measurement signal is greater than or equal to the set size, the control unit 100 detects it in step 229 and does not perform the operation of changing the square wave.

Thereafter, the controller 100 stores the flow rate detection data measured as described above in the memory 110 in the memory 110 and displays the flow rate on the display unit 150, and returns to step 221 to repeat the flow measurement procedure as described above. In this case, the controller 100 may accumulate and manage the detected flow rate detection data by minute, hour, daily, weekly, and monthly, and transmit the data through the communication unit 170 according to a user's selection or a request of an external device. In an embodiment of the present invention, the data logging may include accumulating time data on a daily basis and daily data on a monthly basis. In addition, the display unit 150 may be designed to be rotatable according to the installation location of the flow rate detector, and the rotation angle may be designed to rotate 360 degrees.

5 is a flowchart illustrating a key input processing procedure processed in step 213 of FIG. 4. The controller 600 detects a key input generated while the measurement mode is performed, and processes the key input in the procedure of FIG. 5 in step 213 of FIG. 4.

Referring to FIG. 5, when a key input is generated, the controller 100 checks whether a key input is commanded to change the flow measurement mode in step 311. Here, the change of the flow measurement mode refers to a setting mode that causes a substantial change of the flow measurement mode currently measured, such as when changing the fluid type to command a measurement, changing a measurement frequency, or changing a measured voltage. do. In this case, the control unit 100 detects this in step 311 and displays the setting change mode by controlling the display unit 150 in step 313 and simultaneously controls the driving unit 120 to maintain the fluid measurement mode currently being executed. In the above state, the user registers a desired setting function through the key input unit 160.

When the setting function ends, the control unit 100 detects this in step 315, registers the function set in the step 317 in the memory 110, and applies the square wave and power of the set function by controlling the driving unit 120. In step 319, the control unit 100 returns to the flow measurement mode while performing the flow measurement mode with the changed setting function. As described above, when the controller 100 changes to the new flow measurement mode while performing the flow measurement mode, the control unit 100 performs the procedure of changing the flow measurement mode to be changed while controlling the coil driver 120 to the flow measurement mode before the change. Thereafter, when the procedure for changing the flow rate measurement mode is ended, the controller 100 ends the flow rate measurement mode before the change and starts the measurement operation in the changed flow rate measurement mode. Therefore, the flow rate measurement mode can be changed without interrupting the operation of the flow rate meter, and when the change is completed, the changed flow rate measurement mode can be performed to eliminate the disconnection phenomenon of the flow rate measurement mode.

In addition, if the key input is not a key input for changing a measurement function (for example, data communication, change of displayed measurement data, etc.), the control unit 100 performs the flow measurement mode in step 321, corresponding to the key input. It performs a function and displays it on the display unit 150.

6 is a flowchart illustrating a procedure for controlling a sensor of the flow meter. The control unit 600 detects this when the sensor control time is set while performing the measurement mode, and processes the sensor control procedure by the procedure as shown in FIG. 6 in step 217 of FIG. 4.

Referring to FIG. 6, the control unit 100 removes the film coating accumulated on the electrodes 190a and 190b by applying a minute alternating voltage having a size set to the electrodes 190a and 190b at regular intervals. When the film is coated on the electrodes 190a and 190b, the function of sensing the electromotive force generated in the tube 100 may be reduced. Therefore, the flow meter according to the embodiment of the present invention includes a sensor control unit 140 for applying a fine alternating voltage to the electrodes 190a and 190b, the control unit 100 of the fine voltage for controlling the electrodes 190a and 190b every set period Control the generation and generate a sensor control signal for controlling the sensor controller 140. The sensor controller 140 may be configured in the same form as the coil driver 120, or may be configured only by the driver 125. In this case, the sensor driving voltage is set to a minute voltage capable of vibrating the electrodes 190a and 190b, and the voltage may be generated by the power converter 185 under the control of the controller 100 and applied to the sensor controller 140. In addition, the sensor controller 140 includes the same driver as the driver 125 of the coil driver 120 to form a current path through which the sensor driving voltage is applied to the electrodes 190a and 190b by a sensor control signal output from the controller 100. Can have

Therefore, when the set time is reached, the control unit 100 detects this in step 351 and generates the sensor driving power for driving the electrodes 190a and 190b by controlling the power conversion unit 185 in step 353, wherein the sensor driving power is fine. It can be a power source. Thereafter, the control unit 100 outputs the sensor control signal to the sensor control unit 140 in step 355. Then, the sensor control unit 140 switches the sensor control signal to generate the sensor driving power as a fine alternating power to the electrodes 190a and 190b. To apply. Then, the electrodes 190a and 190b are vibrated by the fine alternating power source to remove the coatings stuck on the electrodes 190a and 190b. The above operation is repeatedly performed for a set time, and when the set time ends, the control unit 100 detects this in step 357 and returns to the flow measurement mode where the sensor control operation ends.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of. In addition, in describing the continuous measurement of the measurement mode, the change of the measurement mode has been described as an example, and the measurement mode is continuously performed even while changing or performing any other change.

BRIEF DESCRIPTION OF THE DRAWINGS The figure explaining the flow measurement principle of an electromagnetic flow meter.

2 is a view showing the configuration of a flow meter according to an embodiment of the present invention

FIG. 3 is a diagram illustrating a detailed configuration of a controller, a coil driver, and a detector in the flow meter of FIG. 2.

4 is a flowchart illustrating an operation procedure of a flow meter having the configuration as shown in FIGS. 2 and 3.

5 is a flowchart showing a processing procedure at the time of external input of FIG.

6 is a flow chart showing a procedure for controlling the sensor of FIG.

Claims (10)

In the control device of the flow meter, At least one coil mounted at a predetermined position of the tube through which the fluid passes, At least one electrode mounted at a predetermined position different from the coil of the pipe; It has multiple frequencies, selects the measurement frequency and power according to the measurement fluid, generates the square wave according to the selected measurement frequency, analyzes and processes the detected measurement signal, and the voltage is proportional to the speed of the fluid at the set time. A control unit for generating a sensor control signal and a sensor power control signal for controlling a sensor to be released; A power conversion unit generating power selected by the control unit; A coil driver which is alternately switched by the square wave to apply the measurement power to the coil; A detector for detecting electromotive force induced by the sensor; A sensor control unit which alternately switches the sensor power output from the power supply unit by the sensor control signal to remove the coating of the sensor; A display unit for displaying the processed flow measurement data under control of the control unit; When a measurement mode change is required by the user's selection, the controller sets the change measurement mode information according to the user's input while maintaining the current measurement mode of the fluid, and changes the measurement mode upon completion of the setting. A flow meter control device comprising an input unit. The method of claim 1, It has a memory for storing the measurement frequency data according to the fluid type, The control unit is a control device of the flow meter, characterized in that for generating the square wave by checking the type of the measurement fluid according to the user's selection. The method of claim 2, wherein the sensor is composed of at least two, The sensor controller includes at least two switching elements, and the switching elements are driven by the sensor control signal which is the alternating switching control signal to control the coating. delete The apparatus of claim 1, wherein the display unit is mounted to rotate at a set angle and is rotated according to a user's setting. The method of claim 5, wherein the control unit A square wave generator for generating the measured frequency as a square wave; A digital converter for converting the detected measurement signal into digital data; And a square wave changer for changing the square wave when the detected measurement signal is equal to or less than a set value. 7. The control apparatus of claim 6, wherein the control unit further comprises a square wave adder which adds or subtracts frequencies of the generated square wave at a set ratio. The method of claim 7, wherein the coil is composed of two, The coil drive unit, A divider for dividing the square wave at a set division ratio; A buffer for buffering the divided square wave, It is composed of at least two switching elements, the switching element is connected between the first driving power source and the second driving power source generated in the power conversion unit and the switching element is alternately switched by the divided square wave to the first And a driver for generating a magnetic force line in the pipe by forming a current path from the coil to the second coil and from the second coil to the first coil. The method of claim 8, And a communication unit for transmitting the measured flow rate data to an external device under the control of the control unit. The method of claim 9, wherein the detection unit An amplifier for amplifying the electromotive force detected by the sensor; And a waveform shaper for waveform shaping the amplified detection signal.

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