CN203037611U - On-line detection device of integrated multi-parameters for electrolyzed functional water - Google Patents

Abstract

The utility model relates to an on-line detection device of integrated multi-parameters for electrolyzed functional water. The on-line detection device comprises a detection unit and an electronic unit, wherein the detection unit consists of a sensor and a flow cell, and the electronic unit consists of a signal conditioning circuit, an analog/digital converter, a single chip microcomputer system, a data communication interface circuit, a keyboard, an LCD (Liquid Crystal Display) and a power supply; each parameter signal of the electrolyzed functional water acquired by the detection unit is converted, amplified and filtered by the signal conditioning circuit, is converted into a digital signal through the analog/digital converter, and then is sent to the single chip microcomputer system through the interface, and the data is subjected to processing treatment, computational analysis and a series of work by the single chip microcomputer, and is sent to the LCD through the interface; and the electronic unit is in data communication with a PC (Personal Computer) at a monitoring center through MAX232 and/or 485 standard interfaces to complete more complex measurement and control tasks.

Description

An integrated multi-parameter online detection device for electrogenerated functional water

(1) Technical field

The invention relates to an integrated multi-parameter online detection device for electrogenerated functional water, which belongs to the field of electrogenerated functional water equipment.

(2) Background technology

Green Pesticide—Electrogenetic functional water is called the magic water of the 21st century. It is to put water in a special device, add a small amount of electrolyte, and treat it with an electric field to make the pH value, oxidation-reduction potential (ORP value), and A general term for acidic electrolyzed water and alkaline electrolyzed water with special functions produced by changes in available chlorine concentration (ACC) and other parameters. Many scholars at home and abroad are paying attention to its mechanism of action and application effect. It has been verified by a large number of experiments that electro-generated functional water has the effects of disease resistance, disease prevention, and yield increase on crops. A new approach to disease control.

The electro-generated functional water technology mainly produces effective chlorine by electrolyzing dilute chlorine-containing electrolyte solutions to inhibit or kill germs and microorganisms, and play a role in disease resistance and disease prevention. Therefore, the key issue in electro-generated functional water technology is the problem of available chlorine, that is, the yield of available chlorine and its influencing factors (such as pH value, ORP value, temperature, etc.); the attenuation process and law of available chlorine in electro-generated functional water and the factors that affect the attenuation. In addition, the control of many parameters in the electro-generated functional water technology must use the available chlorine concentration, such as the electrolysis voltage, the supply of dilute chlorine-containing electrolyte solution, the concentration of chlorine-containing electrolyte solution, and the supply of raw water. Available chlorine concentration in functional water. It is the basis and key to carry out the above work research to find a fast, accurate, convenient and efficient method to measure the available chlorine concentration, pH value, ORP value and temperature of electrogenerated functional water.

At present, there are many methods for determining the concentration of available chlorine, such as iodometric titration, DPD (N, N-diethyl-1,4-phenylenediamine) spectrophotometry, methyl orange spectrophotometry, anion exchange separation, Conductivity detector, iodide ion selective electrode indirect method, etc. However, these methods are mostly used in the laboratory for the determination of available chlorine in fresh water such as drinking water, industrial wastewater, and domestic sewage, while the research on online detection of available chlorine concentration in electrogenerated functional water is still insufficient. Although there are online residual chlorine detection instruments at present, they cannot detect pH value, ORP value and temperature value at the same time, but can only detect residual chlorine concentration, and the detection range of residual chlorine concentration is relatively small, generally only 0~20mg/l.

Therefore, the current online detection of available chlorine concentration, pH value, ORP value, and temperature of electrogenerated functional water requires multiple detection devices to work simultaneously to complete, which is costly, complicated to operate, and heavy workload. Therefore, it is necessary to research and develop an integrated online detection device that is easy to use, low in price, and can quickly measure the available chlorine concentration, pH value, ORP value, and temperature of electrogenerated functional water.

(3) Contents of the invention

The present invention provides an integrated multi-parameter on-line detection for electrogenerated functional water, aiming at the defect that the existing technology cannot meet the simultaneous measurement of available chlorine concentration, pH value, ORP value and temperature of electrogenerated functional water and high detection cost The device can accurately measure the available chlorine concentration, pH value, ORP value and temperature at the same time.

An integrated multi-parameter online detection device for electrogenerated functional water, including a detection unit and an electronic unit;

The detection unit is composed of an available chlorine sensor, a pH sensor, an ORP sensor, a temperature sensor and a flow cell. The available chlorine sensor, pH sensor, ORP sensor and temperature sensor are installed in the flow cell, and the signal output terminals of the four sensors are respectively connected with the corresponding four signal conditioning circuits in the electronic unit; the flow cell is installed in the flow cell The main water outlet pipe of the electrogenetic functional water generation system is connected in parallel to the water outlet side pipe of the electrogenetic functional water generation system, and it is ensured that the flow cell is filled with electrogenetic functional water.

Described available chlorine sensor is any kind of commercially available measuring range is the constant voltage type available chlorine sensor of 0～200mg/l; Described pH sensor is any commercially available measuring range is 0～14, zero potential It is a pH sensor of 7pH; the ORP sensor is any commercially available ORP sensor with a measurement range of -2000mV~+2000mV; the temperature sensor is any commercially available temperature sensor, and the temperature sensor can be an independent It can be installed in the flow cell, or it can be built into the available chlorine sensor, pH sensor or ORP sensor.

Described electronic unit is made of signal conditioning circuit, analog/digital converter, keyboard, LCD display, single-chip microcomputer system, data communication interface circuit and power supply; Described signal conditioning circuit is connected with single-chip microcomputer system through analog/digital converter; The LCD display, the keyboard and the data communication interface circuit are all connected to the single-chip system; the single-chip system is powered by a power supply and is provided with a full-duplex serial communication port.

The signal conditioning circuit is composed of an effective chlorine concentration signal conditioning circuit, a pH value signal conditioning circuit, an ORP value signal conditioning circuit and a temperature signal conditioning circuit. The available chlorine signal conditioning circuit is connected to the signal output terminal of the available chlorine sensor, and the current signal output by the available chlorine sensor is adjusted to a voltage signal that meets the sampling voltage requirements of the analog/digital converter; the pH value signal conditioning circuit is connected to the The signal output terminal of the pH sensor is connected, and the positive and negative voltage signals output by the pH sensor are raised to a positive voltage signal that meets the sampling voltage requirements of the analog/digital converter; the ORP value signal conditioning circuit is connected with the signal output line of the ORP sensor, The positive and negative voltage signals output by the ORP sensor are raised to a positive voltage signal that meets the sampling voltage requirements of the analog/digital converter; the temperature signal conditioning circuit is connected to the signal output line of the temperature sensor, and the voltage signal output by the temperature sensor is adjusted to A voltage signal that meets the sampling voltage requirements of the A/D converter.

The effective chlorine concentration signal conditioning circuit includes a constant potential control circuit, an I/V conversion circuit, a differential amplifier circuit (II) and a low-pass filter circuit (III); the constant potential control circuit is composed of a reference voltage circuit (I) , a fixed resistor R13 for preventing feedback open loop, a capacitor C10 for phase compensation, a buffer IC1 and an operational amplifier IC3; the reference voltage circuit (I) is composed of a reference voltage source A, an inverter B and buffer IC2; the I/V conversion circuit is composed of precision resistor R15; the differential amplifier circuit (II) is composed of buffer IC4, IC5, operational amplifier IC6 and other components; the low-pass filter Circuit (Ⅲ) is used to filter out high-frequency interference.

The pH signal conditioning circuit includes an amplifier circuit (Ⅳ), an adding circuit (Ⅴ), a voltage stabilizing and filtering circuit (Ⅵ); the amplifier circuit (Ⅳ) is characterized in that it consists of fixed resistors R38, R39, R41 and The operational amplifier IC7 is formed; the adding circuit (Ⅴ) is used to raise the positive and negative voltage signals output by the pH sensor to a positive level; the voltage stabilizing and filtering circuit (Ⅵ) is used to output stable voltage signals and filter In addition to high-frequency interference.

The ORP value signal conditioning circuit includes an amplifying circuit (VII), an adding circuit (VIII), a voltage stabilizing and filtering circuit (IX); the amplifying circuit (VII) is characterized in that it is composed of a fixed resistor R29 and an operational amplifier IC8 ; The adding circuit (Ⅷ) is used to raise the positive and negative voltage signals output by the ORP sensor to a positive level; the voltage stabilizing and filtering circuit (Ⅸ) is used to output stable voltage signals and filter out high-frequency interference .

The temperature signal conditioning circuit is composed of fixed resistors R50, R51, R52, R53, R54, R55, R56 and operational amplifier IC12.

The A/D converter is any commercially available A/D converter with good performance with input channels ≥ 4, and its function is to convert the voltage analog signal conditioned by the signal conditioning circuit into a digital signal for SCM system processing.

The keyboard includes six keys, which are respectively "Setting", "Confirm", "Up", "Down", "Left", and "Right", which can realize functions such as inputting data and transmitting commands to the single-chip microcomputer system ;Press the "Setting" key to enter the zero point calibration and slope calibration interface for the available chlorine sensor, pH sensor and ORP sensor, and complete the calibration parameters by pressing the "Up", "Down", "Left" and "Right" keys After the calibration, press the "OK" button to store the calibration parameters; press the "OK" button again, and the LCD will start to display the detected effective chlorine concentration, pH value, ORP value and temperature.

The single-chip microcomputer system is any commercially available 51-core single-chip microcomputer and a higher-performance single-chip microcomputer. The single-chip microcomputer is the core part of this device, and its function is to process the digital signals of available chlorine concentration, pH value, ORP value and temperature converted by the analog-to-digital converter. The corresponding relationship of the output voltage of the signal conditioning circuit is used to calculate the available chlorine concentration value, pH value, ORP value and temperature value.

The LCD display is any commercially available 128×64 dot-matrix liquid crystal display module, which is used to display the available chlorine concentration value, pH value, ORP value and temperature value.

The data communication interface circuit adopts MAX232 and/or 485 standard interface to form the communication between the single-chip microcomputer and the PC.

The power supply is a DC power supply of 5V~24V.

The electronic unit transforms, amplifies, filters, compensates, and processes the signals of various parameters (available chlorine concentration, pH value, ORP value, and temperature) of the electrogenerated functional water collected by the detection unit through the signal conditioning circuit, and then passes the analog/ The digital signal is converted into a digital signal by the digital converter, and then sent to the single-chip microcomputer system through the interface. The single-chip microcomputer performs a series of tasks such as processing, calculation and analysis of the input data, and sends it to the LCD display through the interface, and can be realized by using MAX232 and/or 485 standard interfaces. The data communication between the electronic unit and the monitoring center PC completes more complex measurement and control tasks.

The beneficial effects of the present invention are:

The present invention relates to an integrated online detection device for measuring available chlorine concentration, pH value, ORP value and temperature of electrogenerated functional water, which overcomes the problems existing in the prior art, and its advantages are as follows: first, the The detection device is easy to install and easy to operate, and can simultaneously realize the rapid and convenient measurement of the available chlorine concentration, pH value, ORP value and temperature of the electrogenerated functional water; Value, pH value, ORP value and temperature value are displayed by corresponding numerical values on the liquid crystal display, which has positive effects of convenience, accuracy and practicality; third, the data communication system is composed of MAX232 and/or 485 standard interfaces to realize the electronic unit and Data communication of the PC in the monitoring center.

(4) Description of drawings

Fig. 1 is the overall structural block diagram of the present invention.

Fig. 2 is the signal conditioning circuit diagram of available chlorine concentration in the present invention.

Fig. 3 is a circuit diagram of pH value signal conditioning in the present invention.

Fig. 4 is a circuit diagram of ORP value signal conditioning in the present invention.

Fig. 5 is a temperature signal conditioning circuit diagram in the present invention.

Fig. 6 is the relationship curve between output voltage signal and available chlorine concentration in the present invention.

In the figure, 1. Flow cell, 2. Available chlorine sensor, 3. pH sensor, 4. Signal conditioning circuit, 5. Analog/digital converter, 6. Single-chip microcomputer system, 7. Power supply, 8. Data communication interface circuit, 9 .LCD display, 10. Electronic unit box, 11. Keyboard, 12. ORP sensor, 13. Temperature sensor, 14. Detection unit, 15. Outlet side pipe of the electrogenetic functional water generation system, 16. Electrogenetic functional water generation The main water outlet of the system.

Ⅰ. Reference voltage circuit, Ⅱ. Differential amplification circuit, Ⅲ. Low-pass filter circuit, Ⅳ. Amplifying circuit, Ⅴ. Adding circuit, Ⅵ. Voltage stabilization and filtering circuit, Ⅶ. Amplifying circuit, Ⅷ. pressure and filter circuit.

(5) Specific implementation methods

The preferred embodiments of the present invention will be described in detail with reference to the drawings.

In Fig. 1, the available chlorine sensor (2), pH sensor (3), ORP sensor (12) and temperature sensor (13) are installed in the flow cell (1) and form a detection unit (14). During measurement, the flow cell (1) is installed on the water outlet pipe (15) of the electrogenetic functional water generation system in parallel with the water outlet main pipe (16) of the electrogenetic functional water generation system, and the available chlorine sensor (2), The analog signals detected by the pH sensor (3), ORP sensor (12) and temperature sensor (13) are sent to the corresponding signal conditioning circuit (4) in the box body of the electronic unit (10) through the signal output line.

The box body of the electronic unit (10) is fixed at a position close to the detection unit (14), and contains a signal conditioning circuit (4), an analog/digital converter (5), a single-chip microcomputer system (6), a data communication interface circuit (8), Keyboard (11), LCD display (9) and power supply (7). The electronic unit converts, amplifies, filters, compensates, etc., the signal of various parameters (available chlorine concentration, pH value, ORP value and temperature) collected by the detection unit (14) through the signal conditioning circuit (4). It is converted into digital signals by the analog/digital converter (5), and then sent to the single-chip computer system (6) through the interface, and the single-chip computer performs a series of tasks such as processing, calculation and analysis of the input data, and sends it to the LCD display (9) through the interface , and realize the data communication between the electronic unit and the monitoring center PC through the data communication interface circuit (8), and complete more complex measurement and control tasks.

In Figure 2, the available chlorine sensor is a three-electrode electrochemical sensor, including a working electrode WE, an auxiliary electrode CE and a reference electrode RE. When measuring, apply a constant potential between the working electrode WE and the reference electrode RE, then a current signal will be generated in the circuit composed of the working electrode WE and the auxiliary electrode CE, and the current signal has a certain relationship with the concentration of available chlorine. The signal acquisition circuit and the corresponding conversion and output circuit are externally connected to the available chlorine sensor to realize the measurement of the current signal, and the concentration value of the available chlorine can be calculated by analyzing the current signal. The available chlorine concentration signal conditioning circuit includes a constant potential control circuit, an I/V conversion circuit, a differential amplifier circuit (II) and a low-pass filter circuit (III); the constant potential control circuit consists of a reference voltage source A, an inverter B , the reference voltage circuit (I) composed of buffer IC2, the fixed resistor R13 used to prevent feedback open loop, the capacitor C10 used for phase compensation, buffer IC1, operational amplifier IC3 and other components; the I/V The conversion circuit is composed of precision resistor R15; the differential amplifier circuit (II) is composed of buffers IC4, IC5, operational amplifier IC6 and other components; the low-pass filter circuit (III) is used to filter out high-frequency interference.

In Fig. 3, the pH sensor includes a measuring electrode 1 and a reference electrode 2, and the pH value signal conditioning circuit includes an amplifier circuit (Ⅳ), an addition circuit (Ⅴ), a voltage stabilizing and filtering circuit (Ⅵ); the amplification circuit ( Ⅳ) It is composed of fixed resistors R38, R39, R41 and operational amplifier IC7; the adding circuit (Ⅴ) is used to raise the positive and negative voltage signals output by the pH sensor to positive voltage signals; the voltage stabilizing and filtering circuit ( Ⅵ) It is used to output stable voltage signal and filter out high-frequency interference.

In Figure 4, the ORP sensor includes a measuring electrode 2 and a reference electrode 1, and the ORP value signal conditioning circuit includes an amplifier circuit (Ⅶ), an addition circuit (Ⅷ), a voltage stabilizing and filtering circuit (Ⅸ); the amplifier circuit ( VII) is composed of a fixed resistor R29 and an operational amplifier IC8; the adding circuit (Ⅷ) is used to raise the positive and negative voltage signals output by the ORP sensor to a positive voltage signal; the voltage stabilizing and filtering circuit (IX) is used for Output stable voltage signal and filter out high frequency interference.

In Figure 5, the temperature sensor uses platinum resistance PT1000, and the temperature signal conditioning circuit consists of fixed resistors R50, R51, R52, R53, R54, R55, R56 and operational amplifier IC12.

In the present invention, the detection device is directly installed on the production line of the electrogenetic functional water generation system, and the available chlorine concentration, pH value, ORP value and temperature are detected in real time through soft sensing technology, so as to better guide production. The working process of the detection device to detect the concentration of available chlorine is as follows: the flow cell (1) is installed on the outlet side pipe (15) of the electrogenetic functional water generation system in parallel with the main water outlet pipe (16) of the electrogenic functional water generation system , installing the available chlorine sensor (2), pH sensor (3), ORP sensor (12) and temperature sensor (13) in the flow cell (1) filled with electrogenerated functional water. During measurement, a constant potential is applied between the working electrode WE and the reference electrode RE of the available chlorine sensor (2), the substance to be measured reacts with the working electrode, and the current signal generated by the auxiliary electrode CE is measured at the same time. According to the Ilkovic equation: I= nAFDc/&, the intensity of the current signal is proportional to the concentration of available chlorine in the electro-generated functional water. When this current flows through R15 in Figure 2, a voltage drop occurs, and then the differential voltage signal at both ends of R15 is converted by the differential amplifier circuit (II). The paired single-ended voltage signals are amplified, and then the high-frequency interference is filtered out by the low-pass filter circuit (Ⅲ), and finally the output voltage signal is sent to the analog/digital converter (5). Figure 6 shows the output voltage signal and available chlorine Concentration curve. The analog/digital converter (5) converts the voltage analog signal into a digital signal, and then sends it to the single-chip microcomputer system (6) through the interface. The numbers show the corresponding value.

The invention is provided with functions such as data processing and storage, man-machine interface, data communication and data collection. On-chip memory or off-chip memory can be used for data storage; the man-machine interface is keyboard input and LCD display, users can conveniently control the operation of the system through the keyboard, and can also observe the operating status of the system through the display interface; data communication uses MAX232 and/or Or 485 standard interface constitutes the communication between the electronic unit and the monitoring center PC; the sensor uses a constant voltage type available chlorine sensor, pH sensor, ORP sensor, temperature sensor; the signal conditioning circuit includes a constant potential control circuit, I/V conversion circuit, Amplifying circuit, adding circuit, voltage stabilizing and filtering circuit. The adopted technical solution: the main part of the detection device is in the insulating shell, and the sensor and the installation device are outside the insulating shell. The available chlorine sensor, the pH sensor, the ORP sensor and the temperature sensor are installed in the flow cell, and the signal output terminals of the four sensors are respectively connected with the corresponding four signal conditioning circuits in the electronic unit. The flow cell is installed on the water outlet side pipe of the electrogenetic functional water generation system parallel to the water outlet main pipe of the electrogenetic functional water generation system, and ensures that the flow cell is filled with electrogenetic functional water. After the detection device is powered on, the electronic unit converts, amplifies, filters, and compensates the signals of various parameters (available chlorine concentration, pH value, ORP value and temperature) collected by the detection unit through the signal conditioning circuit. The analog/digital converter converts the digital signal, and then sends it to the microcontroller system through the interface, and the microcontroller processes the input data, calculates and analyzes a series of work, and sends it to the LCD display through the interface, and can use MAX232 and/or 485 standards The interface realizes the data communication between the electronic unit and the monitoring center PC, and completes more complex measurement and control tasks.

Claims (1)

1. an integral multi-parameter on-line measuring device that is used for electrolyzed functional water is characterized in that being made up of detecting unit and electronic unit; Described detecting unit is made up of effective chlorine sensor, pH sensor, ORP sensor, temperature sensor and flow cell; Described effective chlorine sensor, pH sensor, ORP sensor and temperature sensor are installed in the flow cell; Described flow cell is installed on the water outlet side pipe of the electrolyzed functional water generation system in parallel with the water outlet trunk line of electrolyzed functional water generation system; Described temperature sensor independently is installed in the flow cell or is built in described effective chlorine sensor or pH sensor or the ORP sensor;

Described effective chlorine sensor measurement scope 0 ~ 200mg/l; The measurement range of described pH sensor is 0 ~ 14, zero potential is 7pH; Described ORP sensor measurement scope is-2000mV ~+2000mV;

Described electronic unit is made of signal conditioning circuit, A/D converter, keyboard, LCD display, Single Chip Microcomputer (SCM) system, data communication interface circuit and power supply; Described signal conditioning circuit is connected with Single Chip Microcomputer (SCM) system through A/D converter; Described LCD display, keyboard and data communication interface circuit all are connected with Single Chip Microcomputer (SCM) system; Described Single Chip Microcomputer (SCM) system is provided with the full duplex serial communication port;

Described signal conditioning circuit is made of effective chlorine density signal conditioning circuit, pH value signal modulate circuit, ORP value signal modulate circuit and temperature signal regulation circuit; Described effective chlorine signal conditioning circuit links to each other with the signal output part of effective chlorine sensor; Described pH value signal modulate circuit links to each other with the signal output part of pH sensor; Described ORP value signal modulate circuit links to each other with the signal output part of ORP sensor; Described temperature signal regulation circuit links to each other with the signal output part of temperature sensor;

Described effective chlorine density signal conditioning circuit comprises constant potential control circuit, I/V change-over circuit, differential amplifier circuit (II) and low-pass filter circuit (III); Described constant potential control circuit is made of reference voltage circuit (I), the fixed resistance R13 that is used for preventing feedback open loop, the capacitor C 10 that is used for phase compensation, impact damper IC1 and operational amplifier IC3; Described reference voltage circuit (I) is made up of reference voltage source A, reverser B and impact damper IC2; Described I/V change-over circuit is made of precision resistance R15; Described differential amplifier circuit (II) comprises impact damper IC4, IC5 and operational amplifier IC6;

Described pH value signal modulate circuit comprises amplifying circuit (IV), adding circuit (V), voltage stabilizing and filtering circuit (VI); Described amplifying circuit (IV) is made of fixed resistance R38, R39, R41 and operational amplifier IC7; Described adding circuit (V) is used for the positive/negative voltage signal of pH sensor output is lifted to positive level; Described voltage stabilizing and filtering circuit (VI) are used for output stable voltage signal and filtering high frequency interference;

Described ORP value signal modulate circuit comprises amplifying circuit (VII), adding circuit (VIII), voltage stabilizing and filtering circuit (IX); Described amplifying circuit (VII) is made of fixed resistance R29 and operational amplifier IC8;

Described temperature signal regulation circuit is made up of fixed resistance R50, R51, R52, R53, R54, R55, R56 and operational amplifier IC12;

Described A/D converter input channel number 〉=4;

Described keyboard comprises six press keys, is respectively " setting ", " affirmation ", " making progress ", " downwards ", " left ", " to the right ", and described Single Chip Microcomputer (SCM) system is 51 kernel single-chip microcomputers or more high performance single-chip microcomputer;

Described data communication interface circuit employing MAX232 and/or 485 standard interfaces formation single-chip microcomputer are communicated by letter with PC.

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