CN204945080U - A kind of high precision conductivity measurement system - Google Patents
A kind of high precision conductivity measurement system Download PDFInfo
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- CN204945080U CN204945080U CN201520679587.3U CN201520679587U CN204945080U CN 204945080 U CN204945080 U CN 204945080U CN 201520679587 U CN201520679587 U CN 201520679587U CN 204945080 U CN204945080 U CN 204945080U
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- 230000003247 decreasing effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of high precision conductivity measurement system, comprise the four pole type conductivity sensor for measuring liquid medium conductance, test voltage generation module is connected with four pole type conductivity sensor, and under the control of control module, produces test voltage Signal transmissions to test pole plate and produce reference voltage signal and be transferred to reference to pole plate; The current signal that current sample module produces for four pole type conductivity sensor of sampling, current signal exports control module to after pre-amplifying module and secondary amplification module carry out signal amplification, and control module obtains conductivity value by calculating and shows data message by display module.Adopt the technical solution of the utility model, automatically switched by multirange, suitable range ability can be chosen according to different test environments, adopt four pole type conductivity sensor simultaneously, automatically can regulate test voltage according to reference electrode, realize auto-compensation, thus provide measuring accuracy.
Description
Technical field
The utility model relates to electronic measuring technology field, particularly relates to a kind of high precision conductivity measurement system.
Background technology
The quality of Conductivity controllers is uneven in the market, and price difference is also very large, has from hundred yuan to unit up to ten thousand, but the precision of common Conductivity controllers is general not high on the market.The Conductivity controllers of prior art adopts single range to design usually, once the parameter area change being sampled liquid will cause measuring error greatly.Meanwhile, the circuit design such as digital-to-analog conversion, power supply voltage and temperature compensation regulon also can affect measuring accuracy.On the other hand, electrode is another key factor determining conductivity measurement precision, the such as current electroplating industry water saving controller that generally adopts traditional electrode to come in assembly line as conductivity probe, by two metal electrodes and liquid comes into contact during use, apply measuring voltage to respectively two metal electrodes by the +/-2V alternating source of controller (to replace with alternating signal is positive and negative between electrodes, polarization phenomena can be weakened), in each square wave semiperiod 80% place's measuring voltage, (there is interelectrode capacity in conductance cell, stablize in 80% place's capacitance charge, measure accurately), by the impedance of voltage conversion conductance cell, conductivity is conversed by impedance.But this traditional measurement mode, there are polarization phenomena in electrode, working long hours in tank liquor, and the polarization phenomena produced will cause the precision of traditional electrode to decline gradually.Because the speed of traditional electrode precise decreasing is relevant with the environment of place solution with the life-span, so will regularly arrange operating personnel to calibrate or change electrode.Due to actual electroplating assembly line often arranging numerous electrode, be difficult to know which electrode needs calibration maybe will change, so when carrying out electrodes maintenance, just need check all electrodes, considerably increase cost of labor at every turn.
Therefore, for the above-mentioned defect existed in currently available technology, be necessary to study in fact, to provide a kind of scheme, solve the defect existed in prior art.
Utility model content
In order to overcome the defect that prior art exists, necessaryly provide a kind of high precision conductivity measurement system, automatically switched by multirange, suitable range ability can be chosen according to different test environments, adopt four pole type conductivity sensor simultaneously, automatically can regulate test voltage according to test environment, realize auto-compensation, thus provide measuring accuracy.
In order to solve the problem of prior art, the technical solution of the utility model is:
A kind of high precision conductivity measurement system, comprise the four pole type conductivity sensor for measuring liquid medium conductance, this four pole type conductivity sensor comprises two test pole plates and two reference pole plates, test voltage generation module is connected with four pole type conductivity sensor, and under the control of control module, produces test voltage Signal transmissions to described test pole plate and produce reference voltage signal and be transferred to described with reference to pole plate;
The current signal that current sample module produces for described four pole type conductivity sensor of sampling, described current signal exports described control module to after pre-amplifying module and secondary amplification module carry out signal amplification, and described control module obtains conductivity value according to produced test voltage signal and the current signal that uses and shows data message by display module.
Preferably, also comprise range handover module, described range handover module is connected with described pre-amplifying module with described control module, and exports control signal to described pre-amplifying module according to the instruction of control module.
Preferably, also comprise temperature sensing module, for sample temperature value, this temperature value is sent to described control module, described control module carries out corresponding data information compensation according to described temperature value.
Preferably, also comprise communication module, described communication module is used for carrying out data communication with external unit.
Preferably, described communication module is wireless data transceiver module, for data message is sent to external unit wirelessly.
Preferably, described wireless data transceiver module is wireless serial module.
Preferably, be also connected to level transferring chip between described control module and described communication module, the model of described level transferring chip is TXB0108.
Preferably, described four pole type conductivity sensor adopts the TetraCon four pole type conductivity sensor of German WTW.
Preferably, described control module is single-chip microcomputer.
Preferably, the model that described range handover module adopts MAXIM company to release is the integrated analog switch chip of MAX4602.
Compared with prior art, the utility model is automatically switched by multirange, can choose suitable range ability according to different test environments, adopt four pole type conductivity sensor simultaneously, automatically can regulate test voltage according to reference electrode, realize auto-compensation, thus provide measuring accuracy.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the utility model high precision conductivity measurement system.
Fig. 2 is the theory diagram of range handover module in the utility model high precision conductivity measurement system.
Fig. 3 is the utility model high precision conductivity measurement system expansion connection layout in actual applications.
Fig. 4 is the circuit connection diagram of wireless data transceiver module in the utility model high precision conductivity measurement system.
Following specific embodiment will further illustrate the utility model in conjunction with above-mentioned accompanying drawing.
Embodiment
Below with reference to accompanying drawing, the technical scheme that the utility model provides is described further.
See Fig. 1, be depicted as the theory diagram of the utility model high precision conductivity measurement system, comprise four pole type conductivity sensor, test voltage generation module, current sample module, pre-amplifying module, secondary amplification module, range handover module, control module, temperature sensing module, display module and communication module, wherein, four pole type conductivity sensor is for measuring liquid medium conductance, comprise two test pole plates and two reference pole plates, test voltage generation module is connected with four pole type conductivity sensor, and under the control of control module, produce test voltage Signal transmissions to described test pole plate and produce reference voltage signal and be transferred to described with reference to pole plate,
The current signal that current sample module produces for described four pole type conductivity sensor of sampling, pre-amplifying module is used for carrying out elementary amplification to described current signal, prime signal amplifies by secondary amplification module further, and the signal after amplifying is exported to control module;
Temperature sensing module, for sample temperature value, this temperature value is sent to described control module, control module carries out corresponding data information compensation according to described temperature value.
Control module just can calculate conductance (inverse of resistance) by test voltage signal, the current signal sampled and corresponding temperature compensation, by testing the conductance (inverse of resistance) of electrolytic solution between two pole plates, be multiplied by electrode constant again, just obtain the conductivity of solution, and show data message by display module.
The test philosophy of four pole type conductivity sensor is similar to common two electrode sensors, and alternating current on logical on two test pole plates, will produce an electric current between two-plate, and the amount of ions in this electric current and solution is linearly proportional.Control module is processed the current signal that sensor sends, and in conjunction with electrode constant, is finally converted into conductivity values and shows.More than the difference of four pole type conductivity sensor is, two other is with reference to pole plate, does not have electric current to flow through, be only responsible for providing and stablize constant reference potential between these two pole plates.When system changes, as electrode there is polarization phenomena or electrode fouling time, sensor regulates the voltage swing be added on electric current pole plate automatically according to the signal sensed, thus automatically realizes parametric compensation.Thus the problem that the polarization difficult problem thoroughly solved when high conductivity is tested and electrode fouling cause reading inaccurate.
See Fig. 2, be depicted as the theory diagram of range handover module in the utility model high precision conductivity measurement system, range handover module is connected with described pre-amplifying module with described control module, and export control signal to described pre-amplifying module according to the instruction of control module, control range change by adding analog switch at pre-amplifying module, realize range and switch.
Preferably, the model that range handover module adopts MAXIM company to release is the integrated analog switch chip of MAX4602.Analog switch is generally multiple passage, and port number is more, stray capacitance and leakage current larger.When a control passage gating, other passages are in high-impedance state, can exist and have an impact to passage to leakage current, so when selecting analog switch, because current signal is fainter, when leakage current is larger, can produce large error to measurement result.Considered by synthesise various, the analog switch MAX4602 that the present embodiment adopts a leakage current little, reduce leakage current to the impact of testing circuit.MAX4602 analog switch is the four-way analog switch that MAXIM company releases.
By pre-amplification circuit and Automatic Range-changing Circuit combination, amplified current signal.The voltage signal that pre-amplifying module exports, through secondary amplification module, finally obtains suitable magnitude of voltage.Secondary amplification module adopts OP07 amplification chip, OP07 is a kind of low-power consumption, the operational amplifier of non-chopper-zero-stabilized, there is low-down offset voltage (being 150 μ V to the maximum), low maladjustment voltage drift (0.5 μ V/ DEG C), the features such as Low-bias Current (2nA).OP07 is the DIP encapsulation of 8 pins, generally adopts dual power supply, also can adopt single supply simultaneously.The characteristic that OP07 has low input bias current and high open-loop gain simultaneously makes OP07 be applicable to the measuring equipment of high-gain and amplify the aspects such as feeble signal.
The conductivity measurement system of prior art does not have data communication function usually, wireless or wired mode communication cannot be adopted by PC, therefore, do not possess and gather or the data of all Conductivity controllers or the integration control function of situation on monitoring one or more production line, lack the basis of the accurate measurement of use water, water quality Measurement accuracy.
In order to solve the problems of the technologies described above, in a preferred embodiment, the utility model also comprises communication module, for carrying out data communication with external unit.
See Fig. 3, be depicted as the utility model high precision conductivity measurement system expansion connection layout in actual applications, by wireless data transceiver module, data message sent to external unit wirelessly.Data message can be sent to PC by wireless data transceiving concentrator by external unit, thus realizes the data communication with PC.Meanwhile, this conductivity data information can be sent to the control terminal such as solenoid valve, turbo flow meter by wireless data transceiving concentrator wirelessly, thus reaches the object of accurate water and Measurement accuracy water quality.
See Fig. 4, be depicted as the circuit connection diagram of wireless data transceiver module in the utility model high precision conductivity measurement system, wherein wireless data transceiver module is wireless serial module.
The operating voltage of usual wireless data transceiver module is 3.3V, and single-chip microcomputer operating voltage is generally 5V, so add that between single-chip microcomputer and the communication of wireless module level conversion ICTXB0108 carrys out matched level.
Preferably, control module is single-chip microcomputer, and concrete model is AT89S52.AT89S52 is the enhancement mode product of the 89C51 that atmel corp releases, it is a low-power consumption, high-performance 8 8-digit microcontroller, sheet includes the Flash storage unit of general 8 central processing units and 8k, 40 pin DIP encapsulate, always have 32 I/O mouths, 2 full duplex serial communication ports, 3 programmable Timer/counters, 5 interruptions, on sheet, Flash allows program storage in-system programmable components, compatible MCS-51 order set and the distribution of 80C51 pin, for many embedded control systems provide the solution of high flexibility, high performance-price ratio.
The explanation of above embodiment just understands method of the present utility model and core concept thereof for helping.Should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also carry out some improvement and modification to the utility model, these improve and modify and also fall in the protection domain of the utility model claim.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a high precision conductivity measurement system, it is characterized in that, comprise the four pole type conductivity sensor for measuring liquid medium conductance, this four pole type conductivity sensor comprises two test pole plates and two reference pole plates, test voltage generation module is connected with four pole type conductivity sensor, and under the control of control module, produces test voltage Signal transmissions to described test pole plate and produce reference voltage signal and be transferred to described with reference to pole plate;
The current signal that current sample module produces for described four pole type conductivity sensor of sampling, described current signal exports described control module to after pre-amplifying module and secondary amplification module carry out signal amplification, and described control module obtains conductivity value according to produced test voltage signal and the current signal that samples and shows data message by display module.
2. high precision conductivity measurement system according to claim 1, it is characterized in that, also comprise range handover module, described range handover module is connected with described pre-amplifying module with described control module, and exports control signal to described pre-amplifying module according to the instruction of control module.
3. high precision conductivity measurement system according to claim 1 and 2, it is characterized in that, also comprise temperature sensing module, for sample temperature value, this temperature value is sent to described control module, described control module carries out corresponding data information compensation according to described temperature value.
4. high precision conductivity measurement system according to claim 1 and 2, is characterized in that, also comprise communication module, and described communication module is used for carrying out data communication with external unit.
5. high precision conductivity measurement system according to claim 4, is characterized in that, described communication module is wireless data transceiver module, for data message is sent to external unit wirelessly.
6. high precision conductivity measurement system according to claim 5, is characterized in that, described wireless data transceiver module is wireless serial module.
7. high precision conductivity measurement system according to claim 6, is characterized in that, is also connected to level transferring chip between described control module and described communication module, and the model of described level transferring chip is TXB0108.
8. high precision conductivity measurement system according to claim 1, is characterized in that, described four pole type conductivity sensor adopts the TetraCon four pole type conductivity sensor of German WTW.
9. high precision conductivity measurement system according to claim 1, is characterized in that, described control module is single-chip microcomputer.
10. high precision conductivity measurement system according to claim 2, is characterized in that, the model that described range handover module adopts MAXIM company to release is the integrated analog switch chip of MAX4602.
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| CN201520679587.3U CN204945080U (en) | 2015-09-02 | 2015-09-02 | A kind of high precision conductivity measurement system |
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Cited By (9)
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| CN106153682A (en) * | 2016-08-31 | 2016-11-23 | 陈戈 | A kind of municipal rail train battery solution testing device and method of testing thereof |
| CN106199204A (en) * | 2016-07-27 | 2016-12-07 | 武汉诚迈科技有限公司 | A kind of electrical conductivity of solution measuring instruments based on microcontroller |
| CN107064225A (en) * | 2017-05-24 | 2017-08-18 | 华侨大学 | A kind of smart water quality detecting system for the electrical conductivity detection that is self-regulated based on bimodulus |
| CN108469549A (en) * | 2018-03-20 | 2018-08-31 | 哈尔滨理工大学 | Four electrode system of stator winding conductor bars in electrical machines surface resistivity multimetering and its measurement method |
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| CN112432975A (en) * | 2021-01-26 | 2021-03-02 | 南京壹净新材料科技有限公司 | Method for measuring liquid conductivity |
| CN114167137A (en) * | 2021-11-24 | 2022-03-11 | 上海仪电科学仪器股份有限公司 | Device capable of automatically calibrating conductivity cell constant and continuously detecting conductivity of oil material |
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| CN115236136A (en) * | 2022-07-08 | 2022-10-25 | 铜权科技(嘉兴)有限公司 | Wireless multichannel distributed conductivity acquisition system and acquisition method thereof |
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- 2015-09-02 CN CN201520679587.3U patent/CN204945080U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106199204A (en) * | 2016-07-27 | 2016-12-07 | 武汉诚迈科技有限公司 | A kind of electrical conductivity of solution measuring instruments based on microcontroller |
| CN106153682A (en) * | 2016-08-31 | 2016-11-23 | 陈戈 | A kind of municipal rail train battery solution testing device and method of testing thereof |
| CN107064225A (en) * | 2017-05-24 | 2017-08-18 | 华侨大学 | A kind of smart water quality detecting system for the electrical conductivity detection that is self-regulated based on bimodulus |
| CN107064225B (en) * | 2017-05-24 | 2023-03-07 | 华侨大学 | Intelligent water quality detection system based on dual-mode self-adjustment conductivity detection |
| CN108469549A (en) * | 2018-03-20 | 2018-08-31 | 哈尔滨理工大学 | Four electrode system of stator winding conductor bars in electrical machines surface resistivity multimetering and its measurement method |
| CN108469549B (en) * | 2018-03-20 | 2020-06-19 | 哈尔滨理工大学 | Motor stator bar surface resistivity multipoint measurement four-electrode system and measurement method thereof |
| CN111693134A (en) * | 2020-06-19 | 2020-09-22 | 哈尔滨工业大学 | Vibration signal wireless sensing system with variable measuring range |
| CN112432975A (en) * | 2021-01-26 | 2021-03-02 | 南京壹净新材料科技有限公司 | Method for measuring liquid conductivity |
| CN114167137A (en) * | 2021-11-24 | 2022-03-11 | 上海仪电科学仪器股份有限公司 | Device capable of automatically calibrating conductivity cell constant and continuously detecting conductivity of oil material |
| CN114199959A (en) * | 2021-11-30 | 2022-03-18 | 南通汇聚软件科技有限公司 | Gas quadrupole electrochemical conditioning circuit |
| CN115236136A (en) * | 2022-07-08 | 2022-10-25 | 铜权科技(嘉兴)有限公司 | Wireless multichannel distributed conductivity acquisition system and acquisition method thereof |
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