CN106841332A - A kind of instrument integrated control method - Google Patents
A kind of instrument integrated control method Download PDFInfo
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- CN106841332A CN106841332A CN201611210095.5A CN201611210095A CN106841332A CN 106841332 A CN106841332 A CN 106841332A CN 201611210095 A CN201611210095 A CN 201611210095A CN 106841332 A CN106841332 A CN 106841332A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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Abstract
A kind of instrument integrated control method, specially：Acid base concentration signal regulating panel, dissolved oxygen signal regulating panel, conductivity signal conditioning plate gather respective circuit sensor data and are converted into the standard voltage signal that Programmable Logic Controller can be recognized；The instruction database of Programmable Logic Controller is expanded into different types of function block instructions such as acid base concentration measurement, conductivity measurement, oxyty measurement；Corresponding instruction is used to realize demarcation, calibration and measurement to unlike signal according to the different of signal are accessed.The application solves the transmission problem of conventional instrument equipment well, by I/O resources and powerful communication function that PLC enriches, substantially reduces control system cost.
Description
Technical field
The present invention relates to a kind of electricity for being integrated with the signal conditions such as measurement solution acid base concentration, dissolved oxygen concentration and electrical conductivity
Road, specifically a kind of instrument integrated control method.
Background technology
Current world economy Competitive Trend has been transferred in industrialized production from early stage traditional competitive mode, country's manufacture
Industry proposes vigorous demand to instrument and meter for automation and control system, only play each instrument, instrumentation booster action
Industrialized production can be realized.Over time, the instrument of early application, instrumentation can not meet new period industry life
The requirement of product.As technical development of computer is swift and violent, a technological revolution of instrument, instrumentation industry is brought.Instrument, instrument
Table equipment makes progress in many-sides such as implementation process automation, the data processing of measurement result and communication functions.To 20th century
The nineties, it is substantially all in high accuracy, multi-functional measuring instrument and employs microprocessor technology, this is just intelligence instrument
Development is had laid a good foundation.
Traditional instrumentation is output as analog quantity, and long-distance transmissions are easily disturbed, and when number of nodes is more, wiring is difficult
Degree is consequently increased.Intelligence instrument enhances bus communication function although with microprocessor, but does not control work(
Energy.Microprocessor as instrument special equipment, it is open poor, also result in the waste of resource.
The content of the invention
In view of the foregoing defects the prior art has, this application provides a kind of instrument integrated control method, it is in PLC
On the basis of table is accessed by PLC by external modulate circuit, the transmission problem of conventional instrument equipment is solved well, with
By means of I/O resources and powerful communication function that PLC enriches, control system cost is substantially reduced.
To achieve the above object, the technical scheme of the application use is：A kind of instrument integrated control method, specially：
Acid base concentration signal regulating panel, dissolved oxygen signal regulating panel, conductivity signal conditioning plate gather each self-loop sensing
Device data are simultaneously converted into the standard voltage signal that Programmable Logic Controller can be recognized；
The instruction database of Programmable Logic Controller is expanded into the differences such as acid base concentration measurement, conductivity measurement, oxyty measurement
The function block instruction of species；
Corresponding instruction is used to realize demarcation, calibration and measurement to unlike signal according to the different of signal are accessed.
Further, the acid base concentration signal regulating panel, specifically includes：Isolation DC-DC exports two groups of electricity of positive and negative 15V
Source, by sending into step-down original paper after rectifying and wave-filtering, produces one group of positive and negative 12V power supplys supply amplifying circuit to use；
Two holding wires of PH electrodes output are directly connected on U_PH+, U_PH-, are made up of voltage-stabiliser tube in circuit input end
Protection circuit；PH electrodes output signal is introduced into printed substrate with high resistant insulated wire；
Further, dissolved oxygen signal regulating panel, including three-electrode electrochemical sensor；The three-electrode electro Chemical sensing
Device, comprising working electrode WE, reference electrode RE and auxiliary electrode CE；The effect of working electrode WE is to produce chemistry in electrode surface
Reaction；Reference electrode RE in the case where no electric current flows through, between maintenance work electrode and reference electrode voltage it is constant；
Auxiliary electrode CE is used for the current signal that output-response is produced, and the conversion and amplification of signal are realized by I-V change-over circuits.
Further, conductivity signal conditioning plate, specially：Bipolar pulse enters row energization to conductance cell；By dividing
Piezoresistance adjusts the size of bifrequency amplitude, then by after high-pass filter, pulse is converted to bipolarity by unipolarity, amplifier is delayed
Exciting conductance pond after punching.
The present invention can obtain following technique effect due to using above technical scheme：The application is solved well
The transmission problem of traditional instrumentation.By I/O resources and powerful communication function that PLC enriches, control system is substantially reduced
System cost；User can remove installation secondary meter and transducing unit, low cost and easy to maintenance from.
Brief description of the drawings
The total width of accompanying drawing 4 of the present invention：
Fig. 1 is instrument integrated controller structural representation in embodiment；
Fig. 2 is acid base concentration signal regulating panel schematic diagram in embodiment；
Fig. 3 is dissolved oxygen signal regulating panel schematic diagram in embodiment；
Fig. 4 is conductivity signal conditioning plate schematic diagram in embodiment.
Specific embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with the accompanying drawings with specific embodiment pair
The present invention is described in detail.
Acid base concentration, electrical conductivity, oxygen content as water analysis field important electrochemical parameter, the production and living with people
It is closely bound up, how accurately and effectively it to be measured, with important practical significance.Intelligence sensor has signal scaling, surveys
The functions such as amount, calibration and network transmission, it is easy to use but relatively costly, for the scene application of extensive signal acquisition, if
It is standby huge with wiring cost.Research instrument controller integrated technique, in the programmable controller increase multiple signals conditioning with
The instrument function block instructions such as exciting circuit, extension acid base concentration, electrical conductivity, dissolved oxygen, realize the multiple signals of low-cost and high-precision
Collection.
Embodiment 1
The present embodiment provides a kind of instrument integrated control method, acid base concentration signal regulating panel, dissolved oxygen signal condition
Plate, conductivity signal conditioning plate gather respective circuit sensor data and are converted into the normal voltage that Programmable Logic Controller can be recognized
Signal；The instruction database of Programmable Logic Controller is expanded into the variety classeses such as acid base concentration measurement, conductivity measurement, oxyty measurement
Function block instruction；Corresponding instruction is used to realize demarcation, calibration and measurement to unlike signal according to the different of signal are accessed.
The implementation method of acid base concentration signal regulating panel is specially：
Isolation DC-DC exports positive and negative two groups of power supplys of 15V, by sending into 78L12 and 79L12 after rectifying and wave-filtering, produces one group
Positive and negative 12V power supplys supply amplifying circuit is used.Linear voltage regulator is used herein without using Switching Power Supply, although switch
Power-efficient is high, but due to its operation principle, larger switching noise is produced unavoidably and is difficult to eliminate.In general computing is put
The PSRR of big device can roll-off with frequency, so the ripple of Switching Power Supply can be embodied in the output end of amplifying circuit, finally
Influence certainty of measurement.
Two holding wires of PH electrodes output are directly connected on U_PH+, U_PH-, are made up of voltage-stabiliser tube in circuit input end
Protection circuit can effectively protect amplifier input not by extraneous high-voltage breakdown.To eliminate contact conductor electric leakage, blocked with height
Edge line replaces conventional lead and electrode output signal is introduced into printed substrate；In order to prevent wiring board Top electrode lead connecting terminal
Electric leakage, therefore contact conductor has directly been welded on printed substrate, without connection terminal connection；To eliminate printed circuit
The influence leaked electricity between plate lead to measuring circuit input impedance, during wiring printed circuit board (PCB) positive and negative with loop wire by wiring
End, the positive input terminal of amplifier and protection element are surrounded, and are connected with the negative input of amplifier, using positive and negative two inputs of amplifier
End equipotential properties equivalent, input signal is provided the electric leakage of miscellaneous part by dead ring in the circuit board, and input is believed
Number without influence, so as to be effectively improved the input impedance of wiring board, eliminate the insulaion resistance of circuit board to amplifying circuit
The influence of input impedance.
The implementation method of dissolved oxygen signal regulating panel：
Its power circuit is similar with acid base concentration signal regulating panel, and prime is isolated DC-DC circuit, and rear class is linear steady
Pressure output power supply.The electrode of dissolved oxygen balanced type three needs to be operated under 0.6~0.8V continuous current excitations.The application is by right
2.5V a reference sources MC1403 exports partial pressure, obtains the adjustable DC source of energization of 0.66~0.86V scopes.
Three-electrode electrochemical sensor includes working electrode WE, reference electrode RE and auxiliary electrode CE.Working electrode WE's
Effect is to produce chemical reaction in electrode surface；Reference electrode RE is electric for maintenance work on the premise of no electric current flows through
Voltage is constant between pole and reference electrode；Auxiliary electrode CE is used for the current signal that output-response is produced, by I-V change-over circuit realities
The conversion and amplification of existing signal.
If the direct making alive between working electrode and reference electrode, in the presence of voltage, working electrode surface is produced
Chemical reaction.Due to now forming loop between working electrode and reference electrode, the electric current produced by reaction will be by reference electrode
Output, with the change of kinetic current, the voltage between working electrode and reference electrode can also change, it is impossible to keep constant.
Auxiliary electrode is added, seeks to make the voltages keep constant between working electrode and reference electrode by feedback effect, it is ensured that reference
Electrode does not have electric current to flow through, and compulsive reaction electric current is all exported by auxiliary electrode.
The implementation method of conductivity signal conditioning plate is specially：
Its power circuit is similar with acid base concentration signal regulating panel, and prime is isolated DC-DC circuit, and rear class is linear steady
Pressure output power supply.
There is part and be made up of 74HC4060 and its peripheral circuit in frequency, by the DQ output controls of Programmable Logic Controller
Two frequencies that CD4052 is exported to 74HC4060 are switched over.Two output frequencies are respectively 244Hz and 31.250KHz, point
Do not obtained by Q13 and the Q6 frequency dividing of 74HC4060.
It is influence of the capacity effect to measurement result during elimination conductivity measurement, must be by bipolar pulse to conductance cell
Enter row energization.The size of bifrequency amplitude is adjusted by divider resistance, by after high-pass filter, pulse is converted to by unipolarity
Bipolarity, by exciting conductance pond after amplifier buffering.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art in the technical scope of present disclosure, technology according to the present invention scheme and its
Inventive concept is subject to equivalent or change, should all be included within the scope of the present invention.
Claims (4)
1. a kind of instrument integrated control method, it is characterised in that specially：
Acid base concentration signal regulating panel, dissolved oxygen signal regulating panel, conductivity signal conditioning plate gather respective circuit sensor number
According to and be converted into the standard voltage signal that Programmable Logic Controller can be recognized；
The instruction database of Programmable Logic Controller is expanded into the variety classeses such as acid base concentration measurement, conductivity measurement, oxyty measurement
Function block instruction；
Corresponding instruction is used to realize demarcation, calibration and measurement to unlike signal according to the different of signal are accessed.
2. a kind of instrument integrated control method according to claim 1, it is characterised in that the acid base concentration signal condition
Plate, specifically includes：Isolation DC-DC exports positive and negative two groups of power supplys of 15V, by sending into step-down original paper after rectifying and wave-filtering, produces one group
Positive and negative 12V power supplys supply amplifying circuit is used；
Two holding wires of PH electrodes output are directly connected on U_PH+, U_PH-, and protection is made up of voltage-stabiliser tube in circuit input end
Circuit；PH electrodes output signal is introduced into printed substrate with high resistant insulated wire；
3. a kind of instrument integrated control method according to claim 1, it is characterised in that dissolved oxygen signal regulating panel, bag
Include three-electrode electrochemical sensor；The three-electrode electrochemical sensor, comprising working electrode WE, reference electrode RE and auxiliary are electric
Pole CE；The effect of working electrode WE is to produce chemical reaction in electrode surface；Reference electrode RE is in situation about being flowed through without electric current
Under, between maintenance work electrode and reference electrode voltage it is constant；Auxiliary electrode CE is used for the electric current letter that output-response is produced
Number, the conversion and amplification of signal are realized by I-V change-over circuits.
4. a kind of instrument integrated control method according to claim 1, it is characterised in that conductivity signal conditioning plate, tool
Body is：Bipolar pulse enters row energization to conductance cell；The size of bifrequency amplitude is adjusted by divider resistance, then is filtered by high pass
After ripple device, pulse is converted to bipolarity, exciting conductance pond after amplifier buffering by unipolarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611210095.5A CN106841332A (en) | 2016-12-24 | 2016-12-24 | A kind of instrument integrated control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611210095.5A CN106841332A (en) | 2016-12-24 | 2016-12-24 | A kind of instrument integrated control method |
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| Publication Number | Publication Date |
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| CN106841332A true CN106841332A (en) | 2017-06-13 |
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| CN201611210095.5A Pending CN106841332A (en) | 2016-12-24 | 2016-12-24 | A kind of instrument integrated control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109425639A (en) * | 2017-08-28 | 2019-03-05 | 通用汽车环球科技运作有限责任公司 | For detecting method and apparatus existing for fluid |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2754095Y (en) * | 2004-12-13 | 2006-01-25 | 江苏江分电分析仪器有限公司 | Dissolved oxygen electrode |
| CN101226397A (en) * | 2008-02-04 | 2008-07-23 | 南京理工大学 | High reliability distributed Ethernet test control system |
| CN101807060A (en) * | 2009-02-17 | 2010-08-18 | 上海市南洋模范中学 | Online monitoring and control system of sewage quality |
| US20150160178A1 (en) * | 2013-12-06 | 2015-06-11 | Kye-Shin Lee | Universal water condition monitoring device |
| CN104807862A (en) * | 2015-04-20 | 2015-07-29 | 中国农业大学 | Method and device for detecting dissolved oxygen in water |
-
2016
- 2016-12-24 CN CN201611210095.5A patent/CN106841332A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2754095Y (en) * | 2004-12-13 | 2006-01-25 | 江苏江分电分析仪器有限公司 | Dissolved oxygen electrode |
| CN101226397A (en) * | 2008-02-04 | 2008-07-23 | 南京理工大学 | High reliability distributed Ethernet test control system |
| CN101807060A (en) * | 2009-02-17 | 2010-08-18 | 上海市南洋模范中学 | Online monitoring and control system of sewage quality |
| US20150160178A1 (en) * | 2013-12-06 | 2015-06-11 | Kye-Shin Lee | Universal water condition monitoring device |
| CN104807862A (en) * | 2015-04-20 | 2015-07-29 | 中国农业大学 | Method and device for detecting dissolved oxygen in water |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109425639A (en) * | 2017-08-28 | 2019-03-05 | 通用汽车环球科技运作有限责任公司 | For detecting method and apparatus existing for fluid |
| CN109425639B (en) * | 2017-08-28 | 2021-11-30 | 通用汽车环球科技运作有限责任公司 | Method and apparatus for detecting the presence of a fluid |
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Application publication date: 20170613 |
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