CN115290722A - Residual chlorine and pH data acquisition card adopting constant voltage method - Google Patents
Residual chlorine and pH data acquisition card adopting constant voltage method Download PDFInfo
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- CN115290722A CN115290722A CN202210787967.3A CN202210787967A CN115290722A CN 115290722 A CN115290722 A CN 115290722A CN 202210787967 A CN202210787967 A CN 202210787967A CN 115290722 A CN115290722 A CN 115290722A
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Abstract
The invention relates to a residual chlorine and pH data acquisition card adopting a constant voltage method, wherein a pH electrode interface is connected with a pH voltage conversion circuit, the pH voltage conversion circuit is connected with an ADC (analog to digital converter), the ADC is respectively connected with a residual chlorine voltage acquisition circuit, a temperature voltage acquisition circuit and a singlechip, the singlechip is connected with an RS485 communication circuit, the residual chlorine voltage acquisition circuit is connected with a residual chlorine electrode acquisition interface, and the temperature voltage acquisition circuit is connected with a thermistor RT. The invention simultaneously detects residual chlorine and pH value, integrates residual chlorine and pH value in a data acquisition card, reduces cost and improves economic benefit.
Description
Technical Field
The invention relates to the technical field of water quality monitoring equipment, in particular to a residual chlorine and pH data acquisition card of a constant voltage method, which can simultaneously detect residual chlorine and pH value, integrate the residual chlorine and the pH value into one data acquisition card, reduce the cost and improve the economic benefit.
Background
The pH electrode, also known as a pH probe or a pH sensor, is a part of a pH meter that is in contact with a substance to be measured and is used to measure the potential of the electrode. There are generally two methods of measuring pH in aqueous solutions, colorimetry (pH paper and cuvette) and potentiometry. The potentiometry is the only method capable of realizing continuous online measurement and process monitoring, and the potentiometry can obtain accurate and repeatable pH value, and the core theory of pH electrode measurement is Nernst equation. The electrodes used for potentiometry are called galvanic cells. A galvanic cell is a system that functions to convert chemical reaction energy into electrical energy. The voltage of this battery is called the electromotive force (EMF). This electromotive force (EMF) is made up of two half-cells. One of the half-cells is called the measurement electrode, the potential of which is related to a specific ionic activity; the other half-cell is a reference half-cell, commonly referred to as a reference electrode, which is typically in communication with the measurement solution and is connected to the meter. The most familiar and commonly used PH indicator electrode is a glass electrode. An industrial on-line pH measurement system is generally composed of a pH sensor, i.e., a pH electrode, a pH transmitter, an electrode sheath, and a cable.
The residual chlorine electrode is an online residual chlorine sensor, and is matched with a corresponding residual chlorine detector to form an online residual chlorine monitoring system instrument. The residual chlorine electrode is also called residual chlorine sensor and residual chlorine probe. A diaphragm type polarographic (close) sensor is composed of cathode, anode, electrolyte and a gas-permeable film covering the cathode. The residual chlorine in the measured solution is diffused to the cathode through the diaphragm, the proper polarization voltage between the cathode and the anode can reduce the residual chlorine on the cathode, and the chemical reactions generate current in direct proportion to the residual chlorine in the measured solution. The constant voltage type sensor is a microcell measuring system consisting of two platinum electrodes and a reference electrode. When in measurement, a stable potential is kept at the electrode measuring end, and different measured components generate different current intensities with good linearity under the potential.
The chlorine residue is monitored by CLO 2 And ClO in HClO - Ions of which H + The ions are expressed as pH values, and the detection value of residual chlorine can be influenced by the pH values and cannot be ignored. When detecting residual chlorine, the residual chlorine value needs to be compensated according to different pH values. There is a need for a constant voltage residual chlorine and pH data acquisition card that simultaneously detects residual chlorine and pH, integrates residual chlorine and pH in one data acquisition card, reduces cost, and improves economic benefits.
Disclosure of Invention
The invention aims to provide a residual chlorine and pH data acquisition card of a constant voltage method, which can simultaneously detect residual chlorine and pH value, integrate the residual chlorine and the pH value into one data acquisition card, reduce the cost and improve the economic benefit.
A data acquisition card for residual chlorine and pH by a constant voltage method comprises the following steps:
the pH electrode interface, pH electrode interface connection pH voltage conversion circuit, pH voltage conversion circuit connects the ADC converter, chlorine residue voltage acquisition circuit, temperature voltage acquisition circuit, singlechip are connected respectively to the ADC converter, RS485 communication circuit is connected to the singlechip, chlorine residue voltage acquisition circuit connects chlorine residue electrode acquisition interface, temperature voltage acquisition circuit connects thermistor RT.
PH electrode interface connection pH voltage conversion circuit's resistance R1, ground connection behind resistance R1 is connected electric capacity C1 all the way, the 3 rd interface of amplifier U1 is connected to another way, amplifier U1's the 1 st interface, resistance R2 are connected respectively to amplifier U1's the 2 nd interface, resistance R2 is connecting resistance R3, electric capacity C2, amplifier U2's the 3 rd interface respectively, VREF interface is connected to resistance R3, electric capacity C2 ground connection, amplifier U2's the 1 st interface, resistance R4 of amplifier U2 are connected respectively to amplifier U2's the 2 nd interface, the 1 st interface of electric capacity C3, ADC converter is connected respectively to resistance R4, electric capacity C3 ground connection.
The WE interface of the residual chlorine electrode acquisition interface is connected with an inductor L1 of a residual chlorine voltage acquisition circuit, the inductor L1 is connected with a capacitor C4, a resistor R5, a 2 nd interface and a 1 st interface of an amplifier U3 in parallel, then is connected with a resistor R7, the 3 rd interface of the amplifier U3 is connected with a resistor R9 and then is grounded, the resistor R7 is connected with the capacitor C5, the resistor R6, the 2 nd interface and the 1 st interface of the amplifier U4 in parallel, then is connected with a resistor R8, the 3 rd interface of the amplifier U4 is connected with a DAC1 interface, the resistor R8 is respectively connected with a capacitor C6 and a 2 nd interface of an ADC converter, and the capacitor C6 is grounded;
the RE interface connection chlorine residue voltage acquisition circuit's of interface is gathered to chlorine residue electrode inductance L2, inductance L2 connecting resistance R10, resistance R10 parallelly connected electric capacity C7, electric capacity C10, resistance R12 and amplifier U8, amplifier U8's 2 nd interface connection resistance R12, amplifier U8's 1 st interface connection resistance R13, amplifier U8's 3 rd interface connection resistance R14, resistance R14 is connecting resistance R11, amplifier U9's 1 st interface respectively, amplifier U9's 2 nd interface, DAC0 interface are connected respectively to resistance R11, amplifier U9's 3 rd ground connection.
Thermistor RT one end ground connection, the 3 rd interface of resistance R15, electric capacity C8, amplifier U10 of temperature and voltage acquisition circuit is connected respectively to the other end, VREF interface is connected to resistance R15, electric capacity C8 ground connection, 1 st interface, the resistance R17 of amplifier U10 are connected respectively to amplifier U10's the 2 nd interface, and electric capacity C9, the 3 rd interface of ADC converter are connected respectively to resistance, electric capacity C9 ground connection.
The 4 th interface of the ADC converter is connected with the single chip microcomputer, a TX interface of the single chip microcomputer is connected with a 1 st interface of an RS485 communication U7 of the RS485 communication circuit, an EX interface of the single chip microcomputer is respectively connected with a 2 nd interface and a 3 rd interface of the RS485 communication U7, an RX interface of the single chip microcomputer is connected with a 4 th interface of the RS485 communication U7, and a 6 th interface and a 7 th interface of the RS485 communication U7 are respectively connected with a 2 nd interface of the interface CN2 and a 1 st interface of the interface CN 2.
The VREF interface is a power supply voltage interface.
The DAC0 interface of the residual chlorine voltage acquisition circuit is a driving voltage interface, and the DAC1 interface of the residual chlorine voltage acquisition circuit is a lifting voltage interface.
The pH electrode interface is connected with a pH voltage conversion circuit, the pH voltage conversion circuit is connected with an ADC (analog to digital converter), the ADC is respectively connected with a residual chlorine voltage acquisition circuit, a temperature voltage acquisition circuit and a singlechip, the singlechip is connected with an RS485 communication circuit, the residual chlorine voltage acquisition circuit is connected with the residual chlorine electrode acquisition interface, and the temperature voltage acquisition circuit is connected with a thermistor RT. The invention simultaneously detects residual chlorine and pH value, integrates residual chlorine and pH value in a data acquisition card, reduces cost and improves economic benefit.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a circuit diagram of the present invention;
FIG. 3 is a circuit diagram of the pH voltage conversion circuit of the present invention;
FIG. 4 is a circuit diagram of a residual chlorine voltage acquisition circuit of the present invention;
FIG. 5 is a circuit diagram of the temperature voltage acquisition circuit of the present invention;
FIG. 6 is a circuit diagram of an ADC converter, a single chip microcomputer and an RS485 communication circuit according to the present invention;
in the figure: 1. the device comprises a pH electrode interface, a pH voltage conversion circuit 2, a residual chlorine electrode acquisition interface 3, a residual chlorine voltage acquisition circuit 4, a thermistor RT, a temperature voltage acquisition circuit 5, an ADC converter 8, a singlechip 6 and an RS485 communication circuit 9.
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
A data acquisition card for residual chlorine and pH by a constant voltage method comprises the following steps: the pH electrode interface is connected with the pH voltage conversion circuit, the pH voltage conversion circuit 2 is connected with the ADC converter 7, the ADC converter 7 is respectively connected with the residual chlorine voltage acquisition circuit 4, the temperature voltage acquisition circuit 6 and the single chip microcomputer 8, the single chip microcomputer 8 is connected with the RS485 communication circuit 9, the residual chlorine voltage acquisition circuit 4 is connected with the residual chlorine electrode acquisition interface 3, and the temperature voltage acquisition circuit 6 is connected with the thermistor RT5.
The pH electrode interface 1 is connected with a resistor R1 of a pH voltage conversion circuit 2, one path of the resistor R1 is connected with a capacitor C1 and then grounded, the other path of the resistor R1 is connected with a 3 rd interface of an amplifier U1, a 2 nd interface of the amplifier U1 is respectively connected with a 1 st interface of the amplifier U1 and a resistor R2, the resistor R2 is respectively connected with a resistor R3, a capacitor C2 and a 3 rd interface of the amplifier U2, the resistor R3 is connected with a VREF interface, the capacitor C2 is grounded, a 2 nd interface of the amplifier U2 is respectively connected with a 1 st interface of the amplifier U2 and a resistor R4, the resistor R4 is respectively connected with a capacitor C3 and a 1 st interface of an ADC (analog to digital converter) 7, and the capacitor C3 is grounded.
The WE interface of the residual chlorine electrode acquisition interface 3 is connected with the inductor L1 of the residual chlorine voltage acquisition circuit 4, the inductor L1 is connected with the capacitor C4, the resistor R5, the 2 nd interface and the 1 st interface of the amplifier U3 in parallel, then the resistor R7 is connected, the 3 rd interface of the amplifier U3 is connected with the resistor R9 and then grounded, the resistor R7 is connected with the capacitor C5, the resistor R6, the 2 nd interface and the 1 st interface of the amplifier U4 in parallel, then the resistor R8 is connected, the 3 rd interface of the amplifier U4 is connected with the DAC1 interface, the resistor R8 is respectively connected with the capacitor C6 and the 2 nd interface of the ADC converter 7, and the capacitor C6 is grounded; an RE interface of the residual chlorine electrode acquisition interface 3 is connected with an inductor L2 of the residual chlorine voltage acquisition circuit 4, the inductor L2 is connected with a resistor R10, the resistor R10 is connected with a capacitor C7, a capacitor C10, a resistor R12 and an amplifier U8 in parallel, a 2 nd interface of the amplifier U8 is connected with a resistor R12, a 1 st interface of the amplifier U8 is connected with a resistor R13, a 3 rd interface of the amplifier U8 is connected with a resistor R14, the resistor R14 is respectively connected with a resistor R11 and a 1 st interface of the amplifier U9, the resistor R11 is respectively connected with a 2 nd interface of the amplifier U9 and a DAC0 interface, and the 3 rd interface of the amplifier U9 is grounded.
One end of the thermistor RT5 is grounded, the other end of the thermistor RT5 is respectively connected with a resistor R15, a capacitor C8 and a No. 3 interface of the amplifier U10 of the temperature and voltage acquisition circuit 6, the resistor R15 is connected with a VREF interface, the capacitor C8 is grounded, a No. 2 interface of the amplifier U10 is respectively connected with a No. 1 interface and a resistor R17 of the amplifier U10, the resistors are respectively connected with a capacitor C9 and a No. 3 interface of the ADC converter 7, and the capacitor C9 is grounded.
The 4 th interface of ADC converter 7 connects singlechip 8, the 1 st interface of RS485 communication U7 of singlechip 8's TX interface connection RS485 communication circuit 9, the 2 nd interface and the 3 rd interface of RS485 communication U7 are connected respectively to singlechip 8's EX interface, the 4 th interface of RS485 communication U7 of singlechip 8's RX interface connection, the 6 th interface of RS485 communication U7, the 2 nd interface of interface CN2, the 1 st interface of interface CN2 are connected respectively to the 7 th interface.
The VREF interface is a supply voltage interface. The DAC0 interface of the residual chlorine voltage acquisition circuit 4 is a driving voltage interface, and the DAC1 interface of the residual chlorine voltage acquisition circuit 4 is a lifting voltage interface.
The foregoing shows and describes the general principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A data acquisition card for residual chlorine and pH value by constant voltage method is characterized by comprising:
pH electrode interface (1), pH voltage conversion circuit (2) is connected in pH electrode interface (1), ADC converter (7) is connected in pH voltage conversion circuit (2), surplus chlorine voltage acquisition circuit (4), temperature voltage acquisition circuit (6), singlechip (8) are connected respectively in ADC converter (7), RS485 communication circuit (9) is connected in singlechip (8), surplus chlorine electrode acquisition interface (3) is connected in surplus chlorine voltage acquisition circuit (4), thermistor RT (5) is connected in temperature voltage acquisition circuit (6).
2. The residual chlorine and pH data acquisition card adopting a constant voltage method according to claim 1, wherein the pH electrode interface (1) is connected with a resistor R1 of a pH voltage conversion circuit (2), the resistor R1 is connected with a capacitor C1 in one way and then grounded, the other way is connected with a 3 rd interface of an amplifier U1, the 2 nd interface of the amplifier U1 is respectively connected with a 1 st interface and a resistor R2 of the amplifier U1, the resistor R2 is respectively connected with a resistor R3, a capacitor C2 and a 3 rd interface of the amplifier U2, the resistor R3 is connected with a VREF interface, the capacitor C2 is grounded, the 2 nd interface of the amplifier U2 is respectively connected with a 1 st interface and a resistor R4 of the amplifier U2, the resistor R4 is respectively connected with a 1 st interface of the capacitor C3 and an ADC (7), and the capacitor C3 is grounded.
3. The card according to claim 1, wherein the WE interface of the residual chlorine electrode collecting interface (3) is connected to the inductor L1 of the residual chlorine voltage collecting circuit (4), the inductor L1 is connected in parallel to the capacitor C4, the resistor R5, the 2 nd interface and the 1 st interface of the amplifier U3, and then connected to the resistor R7, the 3 rd interface of the amplifier U3 is connected to the resistor R9 and then grounded, the resistor R7 is connected in parallel to the capacitor C5, the resistor R6, the 2 nd interface and the 1 st interface of the amplifier U4, and then connected to the resistor R8, the 3 rd interface of the amplifier U4 is connected to the DAC1 interface, the resistor R8 is connected to the capacitor C6 and the 2 nd interface of the ADC converter (7), respectively, and the capacitor C6 is grounded;
the inductance L2 of RE interface connection chlorine residue voltage acquisition circuit (4) of interface (3) is gathered to the chlorine residue electrode, inductance L2 connecting resistance R10, resistance R10 shunt capacitance C7, electric capacity C10, resistance R12 and amplifier U8, the 2 nd interface connection resistance R12 of amplifier U8, the 1 st interface connection resistance R13 of amplifier U8, the 3 rd interface connection resistance R14 of amplifier U8, resistance R14 is connecting resistance R11, the 1 st interface of amplifier U9 respectively, 2 nd interface, DAC0 interface of amplifier U9 are connected respectively to resistance R11, the 3 rd ground connection of amplifier U9.
4. The card according to claim 1, wherein one end of said thermistor RT (5) is grounded, and the other end is connected to the 3 rd interface of the resistor R15, capacitor C8 and amplifier U10 of the temperature and voltage acquisition circuit (6), respectively, said resistor R15 is connected to VREF interface, said capacitor C8 is grounded, the 2 nd interface of said amplifier U10 is connected to the 1 st interface and resistor R17 of the amplifier U10, respectively, the resistor is connected to the 3 rd interface of the capacitor C9 and ADC converter (7), respectively, and said capacitor C9 is grounded.
5. The residual chlorine and pH data acquisition card adopting the constant voltage method as defined in claim 1, wherein the 4 th interface of the ADC converter (7) is connected with the single chip microcomputer (8), the TX interface of the single chip microcomputer (8) is connected with the 1 st interface of the RS485 communication U7 of the RS485 communication circuit (9), the EX interface of the single chip microcomputer (8) is respectively connected with the 2 nd interface and the 3 rd interface of the RS485 communication U7, the RX interface of the single chip microcomputer (8) is connected with the 4 th interface of the RS485 communication U7, and the 6 th interface and the 7 th interface of the RS485 communication U7 are respectively connected with the 2 nd interface of the interface CN2 and the 1 st interface of the interface CN 2.
6. The data acquisition card for residual chlorine and pH according to claim 1, wherein said VREF interface is a power supply voltage interface.
7. The residual chlorine and pH data acquisition card adopting a constant voltage method according to claim 1, wherein the DAC0 interface of the residual chlorine voltage acquisition circuit (4) is a driving voltage interface, and the DAC1 interface of the residual chlorine voltage acquisition circuit (4) is a boost voltage interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210787967.3A CN115290722A (en) | 2022-07-04 | 2022-07-04 | Residual chlorine and pH data acquisition card adopting constant voltage method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210787967.3A CN115290722A (en) | 2022-07-04 | 2022-07-04 | Residual chlorine and pH data acquisition card adopting constant voltage method |
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| CN115290722A true CN115290722A (en) | 2022-11-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115932394A (en) * | 2022-12-16 | 2023-04-07 | 上海博取仪器有限公司 | PH electrode internal resistance detection device |
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- 2022-07-04 CN CN202210787967.3A patent/CN115290722A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115932394A (en) * | 2022-12-16 | 2023-04-07 | 上海博取仪器有限公司 | PH electrode internal resistance detection device |
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