CN217425276U - High-precision water quality PH real-time monitoring system - Google Patents
High-precision water quality PH real-time monitoring system Download PDFInfo
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Abstract
The utility model discloses a high accuracy quality of water PH real-time monitoring system, including collection module, signal processing module, display module, power module and wireless transmission module, collection module includes PH monitoring and amplification module and temperature sensor, PH monitoring and amplification module includes PH electrode output module and PH enlargies calibration module, PH enlargies calibration module includes cophase amplifier and voltage follower; the signal processing module comprises a Micro Control Unit (MCU) with an ADC module; the wireless transmission module comprises an RS485 communication module, a data transmission unit DTU and a cloud platform. The utility model discloses a monitoring system realizes the real-time automatic monitoring of quality of water PH, has automatic calibration and temperature compensation function, and automatic calibration adopts the mode improvement calibration efficiency of hardware demarcation, and improves the precision of PH monitoring.
Description
Technical Field
The utility model relates to a water quality monitoring technology field especially relates to a high accuracy quality of water PH real-time monitoring system.
Background
At present, the traditional water quality monitoring technical means can only provide manual operation for carrying out regular monitoring and reading operation on water quality PH, and the manual operation is required, so that a large amount of human resources are consumed, the real-time monitoring on water quality health cannot be realized, or the monitoring precision needs to be improved, and therefore a high-precision water quality PH real-time monitoring system is urgently needed.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Based on the above problem, the utility model provides a high accuracy quality of water PH real-time supervision system solves quality of water PH and can not real-time automatic monitoring, or the problem that the monitoring precision remains to improve, realizes quality of water PH real-time automatic monitoring, has automatic calibration and temperature compensation function, and automatic calibration adopts the mode that hardware was markd to improve and marks efficiency, and improves the precision of PH monitoring.
(II) technical scheme
Based on the technical problem, the utility model provides a high accuracy quality of water PH real-time monitoring system, including collection module, signal processing module, display module, power module and wireless transmission module, collection module includes PH monitoring and amplification module and temperature sensor, PH monitoring and amplification module includes PH electrode output module and PH enlargies calibration module, PH enlargies calibration module includes cophase amplifier and voltage follower; the signal processing module comprises a Micro Control Unit (MCU) with an ADC module; the wireless transmission module comprises an RS485 communication module, a Data Transmission Unit (DTU) and a cloud platform;
the positive pole of PH electrode output module is connected to the homophase amplifier, PH electrode output module's negative pole is connected to the voltage follower, and the homophase amplifier is connected the ADC module, temperature sensor connects the ADC module, display module and RS485 communication module are connected respectively to MCU, the DTU is connected to RS485 communication module, the cloud platform is connected to DTU, power module connects after switching respectively RS485 communication module's analog region, RS485 communication module's digital region, MCU, voltage follower, homophase amplifier and display module.
Furthermore, the PH monitoring and amplifying module further comprises an isolation operational amplifier module, and the in-phase amplifier is connected with the ADC module after passing through the isolation operational amplifier module.
Further, the MCU is also provided with a FLASH module, and the FLASH module is connected with the ADC module and the MCU and is used for storing the PH value data and carrying out SPI interactive transmission of the PH value data.
Furthermore, the power supply module comprises a battery or an external power supply, a voltage reduction power supply chip obtained by converting the battery or the external power supply, an LDO2 module, an LDO1 module and a voltage stabilizing source, the voltage reduction power supply chip is connected with an analog area of the RS485 module, the LDO2 module is connected with a digital area of the MCU, the display module and the RS485 module, the LDO1 module is connected with a non-inverting amplifier, and the voltage stabilizing source is connected with the voltage follower.
Furthermore, the battery or an external power supply is connected with the voltage reduction power supply chip and the LDO1 module, the LDO1 module is connected with a voltage stabilization source, the voltage reduction power supply chip and the LDO2 module are connected through a DCDC isolation module, and the DCDC isolation module is used for isolating the analog area and the digital area of the RS485 module.
Further, battery or external power supply provide 12V voltage, the model of step-down power supply chip is LX1509-5.0V, and the step-down converts 5V voltage into, the model of LDO1 module is AMS1117-5.0V, and the step-down converts 5V voltage into, and the model of LDO2 module is AMS1117-3.3V, and the step-down converts 3.3V voltage into, the model of steady voltage source is TL431, and the step-down converts 2.5V voltage into, the model of DCDC isolation module is B0505S.
Further, the model of RS485 communication module is ISO3082DWR, MCU's model is stm32f103RD, provides 3 ADC modules of 12 bit sampling precision, the display module is the OLED display, in-phase amplifier and voltage follower are the different parts of same amplifier, the model of same amplifier is TLC 4502.
Furthermore, the model of the temperature sensor is DS18B20, and the model of the isolation operational amplifier module is HCPL-7840.
Furthermore, two enable pins RE and DE of the RS485 communication module are both connected with a protection resistor, two enable pins RE and DE of the RS485 communication module are both externally connected with a drain electrode of an MOS (metal oxide semiconductor) switching tube, a source electrode of the MOS switching tube is grounded, a grid electrode of the MOS switching tube is connected with an MCU (micro control unit) for a pin TXD for sending data, and a pin R of the RS485 communication module is connected with the MCU for a pin RXD for receiving data.
Furthermore, the non-inverting input end of the same amplifier is connected with the positive electrode PH + of the PH electrode output module, the inverting input end of the same amplifier is connected with one end of a resistor R11, the other end of the resistor R11 is grounded, the first output end of the same amplifier is connected with one end of a resistor R11 through a resistor R10, the output end of the same amplifier is connected with one end of a resistor R8, the other end of a resistor R8 is connected with one end of a resistor R9 and one end of a capacitor C30, the other end of the resistor R9 and the other end of a capacitor C30 are grounded, the positive power supply end of the same amplifier is connected with one end of an LD01 and one end of a capacitor C29, the other end of the capacitor C29 is grounded, the negative power supply end of the same amplifier is grounded, the positive input end of the same amplifier is connected with the middle pin and the negative electrode of a potentiometer RP1, one end of the resistor R7 and one end of the capacitor C31, the other end of the resistor R7 and the other end of the capacitor C31 are grounded, the anode of the potentiometer RP1 is connected with the voltage stabilizing source, and the reverse input end II and the output end II are both connected with the cathode PH-of the PH electrode output module.
(III) advantageous effects
The above technical scheme of the utility model has following advantage:
(1) the utility model discloses a system can realize the real-time supervision of quality of water PH, can monitor the temperature so that carry out temperature compensation, and through cophase amplifier and voltage follower, adopt the mode of hardware to realize demarcating to the PH voltage signal of monitoring, need not the programming demarcation algorithm, alleviate program operation work load, be favorable to improving monitoring efficiency;
(2) the utility model discloses an ADC module among the MCU is 12 bit sampling precision, and under the 3.3V circumstances of inside VREF reference voltage value, reach 0.805 mV's recognition accuracy at most under the ideal condition, the biggest 3.3V of input signal its conversion precision is about 0.02 FS%, and it converts into the precision that the PH precision is 0.003416, therefore, the utility model discloses a sampling precision is higher, and keeps apart that fortune puts that module external output pin has established ties a reverse zener diode its outside and has carried out 3.3V power supply and DGND and connect to guarantee to keep apart the output voltage of fortune putting the module and forever far away at 0-3.3V's output, guarantee that it does not exceed the reference voltage of ADC module, further guaranteed the sampling precision of PH value;
(3) the digital area of the RS485 communication module of the utility model is connected by the protection resistor at the two enabling pins of RE # and DE, thereby realizing the staggered work of the input and output processes and being beneficial to ensuring the communication precision; the DCDC isolation module realizes the isolation of the analog area and the digital area of the RS485 communication module, so that the interference possibility of the RS485 signal is reduced, and the communication precision is further ensured;
(4) the utility model discloses a monitoring system has adopted a special RS485 communication module's operating mechanism, has ingeniously utilized the switching characteristic of MOS pipe, realizes only needing the high-low level of control MOS pipe to realize uploading of data to and the receipt of the automatic choice data of electric energy above this system, make this monitoring system simple structure more.
Drawings
The features and advantages of the invention will be more clearly understood by reference to the accompanying drawings, which are schematic and are not to be understood as imposing any limitation on the invention, and in which:
FIG. 1 is a schematic structural diagram of a high-precision real-time pH monitoring system for water quality according to an embodiment of the present invention;
fig. 2 is a schematic connection diagram of the PH amplification calibration module according to the embodiment of the present invention;
FIG. 3 is a schematic diagram of the connection of pH electrode measurement according to an embodiment of the present invention;
fig. 4 is a schematic connection diagram of the isolation operational amplifier module according to the embodiment of the present invention;
fig. 5 is a schematic diagram of connection of temperature sensor measurement according to an embodiment of the present invention;
fig. 6 is a schematic connection diagram of the MCU according to the embodiment of the present invention;
fig. 7 is a schematic connection diagram of a display module according to an embodiment of the present invention;
fig. 8 is a schematic connection diagram of an RS485 communication module according to an embodiment of the present invention;
fig. 9 is a schematic connection diagram of the buck power chip according to the embodiment of the present invention;
fig. 10 is a schematic connection diagram of an LDO2 module according to an embodiment of the present invention;
fig. 11 is a schematic connection diagram of a DCDC isolation module according to an embodiment of the present invention;
fig. 12 is a schematic connection diagram of an LDO1 module according to an embodiment of the present invention;
fig. 13 is a schematic connection diagram of the voltage regulator according to the embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
The embodiment of the utility model discloses high accuracy quality of water PH real-time monitoring system, as shown in fig. 1, including collection module, signal processing module, display module, power module and wireless transmission module. The acquisition module is connected with the signal processing module, the signal processing module is respectively connected with the display module and the wireless transmission module, and the power supply module is respectively connected with the acquisition module, the signal processing module, the display module and the wireless transmission module.
The acquisition module comprises a PH monitoring and amplifying module and a temperature sensor, wherein the PH monitoring and amplifying module comprises a PH electrode output module and a PH amplifying moduleThe PH electrode output module outputs voltage signals, and the signal intensity of the voltage signals is between-450 mv and 450 mv; the PH amplification calibration module comprises an in-phase amplifier and a voltage follower which are different parts of the same device amplifier as shown in figure 2, the in-phase amplifier is connected with the anode of a PH electrode output module, the voltage follower is connected with the cathode of the PH electrode output module, the measurement of a PH electrode is shown in figure 3, the in-phase amplifier is connected with an ADC module through an isolation operational amplifier module, and a temperature sensor is connected with the ADC module; the type of the same device amplifier is TLC4502, specifically, a non-inverting input end of the amplifier is connected with a positive electrode PH + of the PH electrode output module, a inverting input end of the amplifier is connected with one end of a resistor R11, the other end of the resistor R11 is grounded, a first output end of the amplifier is connected with one end of a resistor R11 through a resistor R10, an output end of the amplifier is connected with one end of a resistor R8, the other end of the resistor R8 is connected with one end of a resistor R9 and one end of a capacitor C30, the other end of the resistor R9 and the other end of the capacitor C30 are grounded, a positive power supply end is connected with one ends of the LD01 and the capacitor C29, the other end of the capacitor C29 is grounded, a negative power supply end is grounded, and a second positive input end of the amplifier is connected with a middle pin and a negative electrode of a potentiometer RP1, one end of a resistor R7 and one end of a capacitor C31, the other end of the resistor R7 and the other end of the capacitor C31 are grounded, the positive electrode of a potentiometer RP1 is connected with the voltage stabilizing source, and the two reverse input ends and the two output ends are both connected with the negative electrode PH < - > of the PH electrode output module; two resistors with the multiple of 2 are connected in series between the pins No. 1 and No. 2 of the TLC4502 amplifier (the low input bias voltage of the TLC4502 amplifier drifts to 1 uV/DEG C), so that the inverted input proportional operational amplifier is formed according to the algorithm of virtual short and virtual break: u shape PH_OUT ＝{(R10+R11)/R11}*U PH+ ＝3*U PH+ The amplifier realizes 3 times amplification of PH + anode electromotive force signals of an input electrode, but two resistors (the resistance values are 91K and 13K respectively) with the multiple relation of 7 times are connected in series with an output pin of the amplifier to realize 8 times reduction of voltage signals, so that an isolation operational amplifier module is operated and amplified, then a No. 6 pin and a No. 7 pin are connected, the No. 5 pin is connected with a potentiometer 3296(W103) in series, a fixed-value resistor which is about half of the maximum resistance value of the potentiometer and a constant-value resistor of an externally input 2.5V voltage stabilizing source are connected in series with the No. 5 pinThe reference is carried out, so that voltage following aiming at the cathode electromotive force output by the electrode is realized, and fine adjustment of the electrode input reference PH-cathode electromotive force can be carried out through the positioner, so that the function of calibrating and calibrating the PH sensor without a calibration algorithm is realized; as shown in fig. 4, the isolation operational amplifier module is characterized in that an external output pin is connected in series with a reverse voltage stabilizing diode U20, the external output pin is powered by 3.3V and is connected with DGND, so that the output voltage of the isolation operational amplifier is ensured to be always at 0-3.3V, the output voltage of the isolation operational amplifier is ensured not to exceed the reference voltage of the ADC, and the sampling precision is ensured, the model of the isolation operational amplifier module is HCPL-7840, the isolation operational amplifier module can amplify the voltage input from outside by 8 times to input to the ADC module in the MCU, and can also amplify analog signals and digital signals in an isolation manner to ensure the precision function of the circuit; as shown in fig. 5, the temperature sensor mainly senses temperature and provides a reference for temperature measurement for subsequent temperature compensation, and the model of the temperature sensor is DS18B 20;
the signal processing module comprises a micro control unit MCU (microprogrammed control unit) with an ADC (analog to digital converter) module and a FLASH module, as shown in fig. 6, the ADC module is connected with a temperature sensor and a PH (potential of hydrogen) detection and amplification module, the MCU is respectively connected with a display module and an RS485 communication module, the model of the MCU chip is stm32f103RD, the MCU chip comprises a 512kB FLASH internal memory and provides 3 12-bit ADCs; the FLASH module mainly stores PH value data and carries out SPI interactive transmission of the PH value data with the MCU module and the ADC module; the ADC module is used for converting the temperature voltage signal and the PH voltage signal, converting the amplified PH voltage signal to the PH value signal, and then performing data SPI transmission with the FLASH module. The ADC module is 12-bit sampling accurate, where in the case of an internal VREF reference voltage value of 3.3V (provided by the LDO2 module), 12-bit sampling accuracy is used to acquire a voltage of 2.5V, then 3300mV/4096 ≈ 0.805mV, that is to say ideally up to a recognition accuracy of 0.805mV, whereas an input signal of maximum 3.3V has a conversion accuracy of approximately 0.805/(3300) ═ 0.000244 ≈ 0.02 FS%, which translates into an accuracy of PH accuracy 14 ═ 0.000244 ═ 0.003416, which is higher than the accuracy of 0.006 required for PH accuracy. And an external crystal oscillator clock is arranged outside the MCU, each power supply pin is subjected to capacitance filtering to ensure the working precision of the MCU, the reset pin of the MCU is provided with a reset button to realize the reset function of an internal program of the MCU, and the reset pin is provided with a filter capacitor to prevent signal disturbance generated by the button.
The display module is an OLED display and is used for displaying the PH value and the temperature value in real time and displaying the operation of the calibration process details; as shown in fig. 7, the input pin of the display module is configured with two 4.7K pull-up resistors, so as to prevent the OLED from being insufficiently supplied to affect the working performance of the whole system.
The wireless transmission module comprises an RS485 communication module, a Data Transmission Unit (DTU) and a cloud platform, RXD and TXD pins of the RS485 communication module are connected with the MCU, the RS485 communication module is connected with the DTU through RS485, and the DTU is connected with the cloud platform and used for cloud uploading and displaying PH data monitored by the system; the DTU is a device supporting 485 wireless data transmission in a broad sense and can be a wireless data acquisition terminal; the cloud platform is also a generalized platform, and is a platform capable of realizing display and storage aiming at data; the RS485 communication module includes a digital region and an analog region, as shown in fig. 8, both RE and DE enable pins of the RS485 communication module are connected to a protection resistor, both RE and DE enable pins of the RS485 communication module are externally connected to a drain of an MOS switch Q1, a source of the MOS switch Q1 is grounded, a gate of the MOS switch Q1 is connected to an MCU for a pin TXD for transmitting data, and an R pin of the RS485 communication module is connected to the MCU for a pin RXD for receiving data; the digital area of the RS485 communication module is connected with two pins for receiving and outputting signals at RE and DE through protective resistors, so that staggered work of input and output processes is realized, and communication precision is ensured; the device can also automatically output the acquired signals without program control, and an MOS tube is connected in series outside two pins of RE and DE and serves as a switch, and the switch can be turned on once a high level is input, so that data is acquired, and therefore, only one input frequency of the high level is required to be input by controlling TXD through software, and the communication functions of receiving and transmitting the data are realized; the analog region of the RS485 communication module is respectively connected with a protection resistor and a reverse voltage stabilizing diode (R4, TVS2, R2 and TVS1) in series at A, B two voltage input and output pins to achieve the purpose of protecting the circuit, then capacitors are connected in series at VCC1 and VCC2 two power supply pins to filter and reduce noise, so that the interference of the noise of the alternating current of the incoming 220V alternating current is prevented, and the circuit precision is ensured; the model of the RS485 communication module chip is ISO3082DWR, and the device can be used in the range of-40 ℃ to +85 ℃.
The power supply module comprises a battery or an external power supply, a voltage reduction power supply chip, an LDO2 module, an LDO1 module and a voltage stabilizing source, wherein the battery or the external power supply provides 12V voltage, the voltage reduction power supply chip and the LDO1 module are connected and are converted into 5V voltage, the voltage reduction power supply chip is isolated by a DCDC isolation module and then is connected with the LDO2 module, the voltage reduction power supply chip is connected with an external analog area (pins from No. 9 to No. 16) of an RS485 module and provides 5V voltage, the LDO2 module reduces the voltage and converts the voltage into 3.3V voltage, an external digital area (pins from No. 1 to No. 8) of an MCU, a display module and the RS485 module is connected and provides 3.3V voltage, the LDO1 module reduces the voltage and converts the voltage into 5V voltage, the voltage stabilizing source and an in-phase amplifier are connected and provide 5V voltage, and the voltage stabilizing source is connected with a voltage follower and provides 2.5V voltage; the buck power supply chip is shown in fig. 9, the model is LX1509-5.0V, the model is LDO2 module is shown in fig. 10, the model is AMS1117-3.3V, the DCDC isolation module is shown in fig. 11, the model is B0505S, and isolation of 5V input of the buck power supply module in the analog region is mainly aimed at, so that one of the analog region and the digital region of RS485 is isolated, the possibility of interference of RS485 signals is reduced, and the communication accuracy is ensured; the LDO1 module is shown in FIG. 12, model AMS1117-5.0V, and the external part of LDO2 is connected with capacitor filtering and diode voltage stabilization; the voltage regulator is shown in fig. 13, and is a controllable precise voltage regulator of model TL431, the output voltage of the voltage regulator can be set to any value from Vref (2.5V) to 36V by using two resistors, the typical dynamic impedance of the device is 0.2 Ω, the temperature characteristic is flat in the whole temperature range instead of a voltage regulator diode, and the typical value is 50 ppm/degree centigrade.
In summary, the high-precision real-time water quality PH monitoring system has the following beneficial effects:
(1) the utility model discloses a system can realize the real-time supervision of quality of water PH, can monitor the temperature so that carry out temperature compensation, and through cophase amplifier and voltage follower, adopt the mode of hardware to realize demarcating to the PH voltage signal of monitoring, need not the programming demarcation algorithm, alleviate program operation work load, be favorable to improving monitoring efficiency;
(2) the utility model discloses an ADC module among the MCU is 12 bit sampling precision, and under the 3.3V circumstances of inside VREF reference voltage value, reach 0.805 mV's recognition accuracy at most under the ideal condition, the biggest 3.3V of input signal its conversion precision is about 0.02 FS%, and it converts into the precision that the PH precision is 0.003416, therefore, the utility model discloses a sampling precision is higher, and keeps apart that fortune puts that module external output pin has established ties a reverse zener diode its outside and has carried out 3.3V power supply and DGND and connect to guarantee to keep apart the output voltage of fortune putting the module and forever far away at 0-3.3V's output, guarantee that it does not exceed the reference voltage of ADC module, further guaranteed the sampling precision of PH value;
(3) the digital area of the RS485 communication module of the utility model is connected by the protection resistor at the two enabling pins of RE # and DE, thereby realizing the staggered work of the input and output processes and being beneficial to ensuring the communication precision; the DCDC isolation module realizes the isolation of the analog area and the digital area of the RS485 communication module, so that the interference possibility of the RS485 signal is reduced, and the communication precision is further ensured;
(4) the utility model discloses a monitoring system has adopted a special RS485 communication module's operating mechanism, has ingeniously utilized the switching characteristic of MOS pipe, realizes only needing the high-low level of control MOS pipe to realize uploading of data to and the receipt of the automatic choice data of electric energy above this system, make this monitoring system simple structure more.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A high-precision water quality PH real-time monitoring system is characterized by comprising an acquisition module, a signal processing module, a display module, a power supply module and a wireless transmission module, wherein the acquisition module comprises a PH monitoring and amplifying module and a temperature sensor, the PH monitoring and amplifying module comprises a PH electrode output module and a PH amplifying calibration module, and the PH amplifying calibration module comprises a same-phase amplifier and a voltage follower; the signal processing module comprises a Micro Control Unit (MCU) with an ADC module; the wireless transmission module comprises an RS485 communication module, a Data Transmission Unit (DTU) and a cloud platform;
the positive pole of PH electrode output module is connected to the homophase amplifier, PH electrode output module's negative pole is connected to the voltage follower, and the homophase amplifier is connected the ADC module, temperature sensor connects the ADC module, display module and RS485 communication module are connected respectively to MCU, the DTU is connected to RS485 communication module, the cloud platform is connected to DTU, power module connects after switching respectively RS485 communication module's analog region, RS485 communication module's digital region, MCU, voltage follower, homophase amplifier and display module.
2. The system according to claim 1, wherein the PH monitoring and amplifying module further comprises an isolation operational amplifier module, and the in-phase amplifier is connected to the ADC module after passing through the isolation operational amplifier module.
3. The high-precision real-time water quality PH monitoring system of claim 1, wherein the MCU further comprises a FLASH module, and the FLASH module is connected with the ADC module and the MCU and used for storing PH value data and performing SPI interactive transmission of the PH value data.
4. The system for monitoring the pH of the water with high precision according to claim 1, wherein the power supply module comprises a battery or an external power supply, a voltage reduction power chip obtained by converting the battery or the external power supply, an LDO2 module, an LDO1 module and a voltage stabilizing source, the voltage reduction power chip is connected with an analog area of an RS485 module, the LDO2 module is connected with a digital area of an MCU, a display module and the RS485 module, the LDO1 module is connected with a non-inverting amplifier, and the voltage stabilizing source is connected with a voltage follower.
5. The system for monitoring the pH of water with high precision according to claim 4, wherein the battery or an external power supply is connected with the voltage reduction power chip and the LDO1 module, the LDO1 module is connected with a voltage stabilizing source, the voltage reduction power chip and the LDO2 module are connected through a DCDC isolation module, and the DCDC isolation module is used for isolating an analog area and a digital area of the RS485 module.
6. The high-precision real-time pH monitoring system for water quality as claimed in claim 5, wherein the battery or external power supply supplies 12V voltage, the type of the voltage reduction power supply chip is LX1509-5.0V, the voltage reduction is converted into 5V voltage, the type of the LDO1 module is AMS1117-5.0V, the voltage reduction is converted into 5V voltage, the type of the LDO2 module is AMS1117-3.3V, the voltage reduction is converted into 3.3V voltage, the type of the voltage stabilization source is TL431, the voltage reduction is converted into 2.5V voltage, and the type of the DCDC isolation module is B0505S.
7. The system according to claim 4, wherein the RS485 communication module is ISO3082DWR, the MCU module is stm32f103RD, 3 ADC modules with 12-bit sampling precision are provided, the display module is an OLED display, the in-phase amplifier and the voltage follower are different parts of the same amplifier, and the same amplifier is TLC 4502.
8. The system for monitoring the pH of the water with high precision according to claim 2, wherein the model of the temperature sensor is DS18B20, and the model of the isolation operational amplifier module is HCPL-7840.
9. The system according to claim 1, wherein both RE and DE enable pins of the RS485 communication module are connected with a protection resistor, both RE and DE enable pins of the RS485 communication module are externally connected with a drain electrode of an MOS (metal oxide semiconductor) switching tube, a source electrode of the MOS switching tube is grounded, a grid electrode of the MOS switching tube is connected with an MCU (microprogrammed control unit) through a TXD (data transmission) pin for transmitting data, and an R pin of the RS485 communication module is connected with the MCU through an RXD pin for receiving data.
10. The system for monitoring the pH of water with high precision according to claim 7, wherein the non-inverting input terminal of the same amplifier is connected to the positive electrode PH + of the PH electrode output module, the inverting input terminal is connected to one terminal of a resistor R11, the other terminal of the resistor R11 is grounded, the first output terminal is connected to one terminal of a resistor R11 through a resistor R10, the output terminal is connected to one terminal of a resistor R8, the other terminal of the resistor R8 is connected to one terminal of a resistor R9 and one terminal of a capacitor C30, the other terminal of the resistor R9 is grounded to the other terminal of a capacitor C30, the positive power terminal is connected to one terminals of the LD01 and the capacitor C29, the other terminal of the capacitor C29 is grounded, the negative power terminal is grounded, the forward input terminal is connected to the middle pin and the negative pole of a potentiometer 36RP 85, one terminal of the resistor R38 and one terminal of the capacitor C31, the other terminal of the resistor R7 is grounded to the other terminal of the capacitor C31, the positive pole of the potentiometer RP 2 is connected to the voltage regulator, the reverse input end II and the output end II are both connected with the negative electrode PH-of the PH electrode output module.
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| CN114594139A (en) * | 2022-03-30 | 2022-06-07 | 中大检测(湖南)股份有限公司 | High-precision water quality PH real-time monitoring system |
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