CN105823811A - pH value sensor - Google Patents
pH value sensor Download PDFInfo
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- CN105823811A CN105823811A CN201610194104.XA CN201610194104A CN105823811A CN 105823811 A CN105823811 A CN 105823811A CN 201610194104 A CN201610194104 A CN 201610194104A CN 105823811 A CN105823811 A CN 105823811A
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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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Abstract
The invention discloses a pH value sensor which comprises a shielding shell.A rubber sealing plate is arranged in the shielding shell and divides a shell body into an upper cavity and a lower cavity, a processing unit is arranged in the upper cavity, a PH electrode is arranged in the lower cavity and comprises a reference electrode and a measurement electrode, the reference electrode is a copper sulfate electrode and is independently arranged in the lower cavity, the measurement electrode is composed of a glass cavity, a metal sheet arranged in the glass cavity and a PH sensitive semi-permeable membrane covering the metal sheet, and the metal sheet of the measurement electrode is connected with a circuit board through a high-insulation shielded wire.The PH sensitive semi-permeable membrane is welded on the metal sheet through a shielded wire and is led out of the shielding shell.A microprocessor module is further connected with a wireless transmitting-receiving module, the wireless transmitting-receiving module is in communicating connection with a wireless intelligent gateway, and the microprocessor module is in communicating connection with a computer and a mobile device provided with terminals through the wireless intelligent gateway.The pH value sensor can effectively avoid interference, improve PH detection accuracy and accurately and rapidly obtain measurement results.
Description
Technical field
The invention belongs to technical field of agriculture science, particularly relate to a kind of pH value sensor.
Background technology
PH value is measured and controls in fields such as biochemistry, environmental science, clinical medicine, industry and agricultural productions particularly important, such as in agricultural production, many plants have hobby acid or the behavior of basic soil, in aquaculture, the pH value of water is aquaculture and the important indicator of field planting environment, have influence on existence and the change of water quality ecological environment of organism in water, water quality pH value is great on habitable environment impact, in environmental applications field, acid rain detection is mainly realized by the pH value of detection solution.
For the measurement of pH value, before not inventing PH sensor, it is all to use manual measurement method to realize.Main measurement means has PH reagent paper, PH indicator and PH meter, is mostly dependent on field investigation and sampling, then carries out next step inspection, and process is complicated, inefficient.Although these methods are simple to operate, low cost, but all can only qualitative detection, and industrial in some production, such as food, medical treatment etc., do not allow to join in solution by PH indicator, therefore there is certain limitation.
At present, the monitoring of water quality PH is still obtained by ordinary sensors measurement, delayed to analyzing in real time of data, it is impossible to realize water quality inline diagnosis, there is also bigger measurement error simultaneously, it is impossible to realize the risk management and control of aquaculture and field planting, have much room for improvement.
Summary of the invention
In view of the above-mentioned problems in the prior art, present invention is primarily targeted at the defect solving prior art, it is provided that a kind of pH value sensor, interference, raising PH accuracy of detection can be prevented effectively from, obtain measurement result quickly and accurately.
The technical solution used in the present invention is as follows:
A kind of pH value sensor, including shielding shell, it is provided with rubber gasket sheet in shielding shell and housing is separated into upper chamber and lower chambers, being provided with processing unit in upper chamber, described processing unit includes the microprocessor module that the A/D modular converter that the Signal-regulated kinase that circuit board is connected is connected with Signal-regulated kinase is connected with A/D modular converter and the power management module being connected with microprocessor module with circuit board；Bottom chamber is provided with PH electrode, PH electrode includes reference electrode, measures electrode, reference electrode is copper sulfate electrode and is independently disposed to bottom chamber, measuring electrode to be made up of the PH sensitivity semipermeable membrane of glass chamber with the sheet metal being arranged in glass chamber and covering sheet metal, the shielding line that the sheet metal of measurement electrode is insulated by height is connected with circuit board；PH sensitivity semipermeable membrane is welded on sheet metal by shielding line and draws in shielding shell, coordinates reference electrode to measure pH value；Microprocessor module is also associated with radio receiving transmitting module, and radio receiving transmitting module communication connection has gtw gprs, and microprocessor module is connected to be positioned at the computer of terminal and mobile device by gtw gprs communication link.
Further, the measurement electrode tip stretched out outside shielding shell is socketed with protective cover, and protective cover is copper drainage screen.
Further, sheet metal is become by silver or the copper of good conductivity.
Further, shielding shell is metal-back.
In sum, compared with prior art, the invention has the beneficial effects as follows:
The present invention in the manner described above by reference electrode, measure electrode and be arranged at shielding shell lower chambers, be allowed to separate with the processing unit being positioned at upper chamber, it is to avoid processing unit receives the corrosion of fluid to be measured；By reference electrode, measure electrode and be provided separately, be conducive to avoiding interference, reduce PH measurement error be allowed to measure the most accurate；PH sensitivity semipermeable membrane covers sheet metal, and the shielding line that sheet metal is insulated by height is connected with circuit board, utilizes the PH sensitivity of PH sensitivity semipermeable membrane can carry out the measurement of liquid pH value accurately and rapidly；Simultaneously, the present invention additionally uses gtw gprs, the present invention can be communicated by the equipment of gtw gprs with terminal, pH value according to surveyed liquid carries out inline diagnosis, and make corresponding action, as being connected to pumping motor, when pH value reflects surveyed water or other liquid too high or too low, control pumping motor to draw water in container dilution, thus play the effect regulating pH value.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the basic structure schematic diagram of the present invention.
Detailed description of the invention
All features disclosed in this specification, or disclosed all methods or during step, in addition to mutually exclusive feature and/or step, all can combine by any way.
As shown in Figure 1: a kind of pH value sensor of the present embodiment, including shielding shell, shielding shell is metal-back, it is provided with rubber gasket sheet in shielding shell and housing is separated into upper chamber and lower chambers, being provided with processing unit in upper chamber, described processing unit includes the microprocessor module that the A/D modular converter that the Signal-regulated kinase that circuit board is connected is connected with Signal-regulated kinase is connected with A/D modular converter and the power management module being connected with microprocessor module with circuit board；Bottom chamber is provided with PH electrode, PH electrode includes reference electrode, measure electrode, reference electrode is copper sulfate electrode and is independently disposed to bottom chamber, measure electrode to be made up of the PH sensitivity semipermeable membrane of glass chamber with the sheet metal being arranged in glass chamber and covering sheet metal, sheet metal is become by silver or the copper of good conductivity, the sheet metal measuring electrode is connected with circuit board by the high shielding line insulated, reference electrode is provided with, in measuring interelectrode gap, the sheet rubber being made up of electro-insulating rubber, reference electrode and the interference measured between electrode are slackened further, reduce measurement error；PH sensitivity semipermeable membrane is welded on sheet metal by shielding line and draws in shielding shell, coordinates reference electrode to measure pH value；The measurement electrode tip stretched out outside shielding shell is socketed with protective cover, and protective cover is copper drainage screen；Microprocessor module is also associated with radio receiving transmitting module, and radio receiving transmitting module communication connection has gtw gprs, and microprocessor module is connected to be positioned at the computer of terminal and mobile device (including mobile phone, Ipad etc.) by gtw gprs communication link.
The present invention is relatively suitably applied the occasion equipped with network such as warmhouse booth.Gtw gprs includes processor and the power supply for power supply, and processor is electrically connected with touch screen, flash memory, ram memorizer, ethernet communication module, wifi module, GPRS module, USB interface, jtag interface, RS232 EBI, Z-wave module, time and reseting module, intelligent cloud platform interface, subnet penetrate the assemblies such as module.
Processor is for processing from the data message of each assembly above-mentioned being electrically connected, command information and control information.In the present embodiment, processor uses the Samsung S3C6410 processor with 64/32 inside bus structure.
Power supply is for providing the running voltage needed for each assembly.
Touch screen is used for carrying out man-machine interaction, both the essential information of gtw gprs can have been shown, such as time, IP address, the information such as duty of connected smart machine, it is also possible to realize setting and the control of above-mentioned essential information for this gtw gprs of touch control operation.
Flash memory is for depositing the data such as the system code of processor operation of this gtw gprs, application program.
The data that RAM memory is running with wait for the processor depositing this gtw gprs.
RS232 data bus interface is used for growth data.
USB module is for being connected to USB peripheral by this gtw gprs, such as computer or USB flash disk, with backup or run the program in USB peripheral.
Jtag interface is for connecting a development board to fire and to debug the system code of this gtw gprs, application program.
This gtw gprs is accessed the Internet by wired Yu wireless communication mode by ethernet communication module and wifi module respectively, GPRS module is for accessing global system for mobile communications (GlobalSystemforMobileCommunications by this gtw gprs, GSM), external communication device can be operated at any time realizing user, such as computer or mobile phone, realize communicating to know and control the duty of smart machine with this gtw gprs.
Z-wave module is for connecting this gtw gprs and smart machine to carry out data interaction and control meeting the communication of Z-wave standard agreement.Such as, the control instruction of user can be sent to by its external communication device or directly be input to this gtw gprs by touch screen, the instruction of user is accurately sent to, to the smart machine meeting z-wave standard, such as meet the curtain motor of z-wave standard, headlamp switch, door lock etc. by the processor of this gtw gprs by Z-wave module；The instantaneous operating conditions of the above-mentioned smart machine meeting z-wave standard can also be obtained by Z-wave module simultaneously.
Time and reseting module are for arranging the time of this gtw gprs and this gtw gprs that resets.This gtw gprs can pass through Ethernet, wifi or GPRS accesses the judgement position, IP address of the Internet acquisition and automatically arrange the time；By touch screen, time and time zone can also be set by User Defined.
Intelligent cloud platform interface for being connected to an intelligent cloud platform by this gtw gprs, and configure, on intelligent cloud platform, the smart machine (such as pumping motor) applying this gtw gprs, control and personal settings management.
Subnet penetrates module for realizing this gtw gprs automatically and external communication device, such as computer or the connection of mobile phone of user.Subnet penetrates module and automatically obtains the public network IP address at gtw gprs place, search out an idle port at random and take this port simultaneously, gtw gprs meeting this IP address of real time record and port numbers data, intermittent to intelligent cloud platform transmission heartbeat packet, intelligent cloud platform can be by information real-time update to data base, and external communication device is communicatively connected to automatically be connected to carry out data interaction with gtw gprs foundation after intelligent cloud platform obtains the IP address and port numbers that gtw gprs issues by GPRS, wifi, Ethernet etc..
During use, the computer of external communication device such as user or mobile phone receive the instruction of user's input and by the communication mode wirelessly or non-wirelessly such as GPRS, wifi, Ethernet, the instruction of user are conveyed directly to gtw gprs, it is achieved the personal settings such as smart machine is checked, controls, monitors, configured by data interaction the instruction according to user, scene set, editor's scene manage.In addition, user can also access the Internet by external communication device and login intelligent cloud platform, because this gtw gprs accesses this intelligent cloud platform by intelligent cloud platform interface, therefore user can also carry out checking on intelligent cloud platform, controls, monitors, configures, the personal settings of smart machine are managed by scene set, editor's scene etc..
The advantages such as described gtw gprs uses z-wave technology and smart device communication, and z-wave technology is a kind of novel wireless communication agreement, has exploitation simple, and versatility is high, compatible strong, low-power consumption, and low cost supports automatic network-building, both-way communication.
The preparation method of a kind of PH sensitivity semipermeable membrane, comprises the steps:
The most at room temperature, choose ethylene-vinyl acetate copolymer (EVA) as base material film raw material of substance, choose polystyrene-maleic anhydride alternate copolymer (PSMA) as PH sensitivity functional high molecule material, reactant dispensing is carried out according to the proportioning that mass ratio is 7:3～4:6 of ethylene-vinyl acetate copolymer and polystyrene-maleic anhydride alternate copolymer, use one or both the mixture in dichloromethane and chloroform as solvent, and reactant and solvent are mixed with the ratio that reactant total mass ratio is 70:1～60:1 according to solvent, reactant is made to be dissolved in solvent；Reactant dispensing is carried out according to the proportioning that mass ratio is 6:4 of ethylene-vinyl acetate copolymer and polystyrene-maleic anhydride alternate copolymer, and reactant and solvent are mixed with the ratio that reactant total mass ratio is 70:1 according to solvent, make reactant be dissolved in solvent and carry out the most miscible synthesizing chemical-reacting；The mass ratio of dichloromethane and chloroform is 1:1, uses the mixture of dichloromethane and chloroform as solvent；
2. by described step 1. in solute reactant connect condensation reflux unit with solvent mixture, under ultrasound condition, make the most molten reaction product mixture be dissolved at 55 DEG C to carry out 3 ~ 3.5h miscible synthesizing chemical-reacting altogether, obtain the PH sensitivity semipermeable membrane material of liquid；
3. take cleaning, dry flat glass plate, glass plate is made to keep level, by through described step 2. after the PH sensitivity semipermeable membrane material of liquid prepared the most directly water on glass plate, the PH sensitivity semipermeable membrane material making liquid is made thinner, natural drying 2 hours, makes the PH sensitivity semipermeable membrane material of liquid adhere to film-forming on a glass；
4. compound concentration is the alkali liquor (NaOH solution) of 0.005 ~ 0.01mol/L, the glass plate of the PH sensitivity the semipermeable membrane at room temperature attachment in the 3. middle preparation of described step being dried is immersed in 0.5 ~ 1h in alkali liquor, make PH sensitivity semipermeable membrane automatically come off floating with glass plate in alkali liquor, from alkali liquor, take out PH sensitivity semipermeable membrane；
5. using concentration is the HCl solution of 0.005 ~ 0.01mol/L, the PH sensitivity semipermeable membrane taken out from described step 4. alkali liquor is carried out pickling, the alkali liquor of PH sensitivity semipermeable membrane attachment is neutralized, then makes PH sensitivity semipermeable membrane natural drying, i.e. can get PH sensitivity semipermeable membrane.
The present embodiment, by the most molten mixed method, is prepared for EVA/PSMAPH sensitive membrane.Again through overpickling after alkali processes, making anhydride group change into carboxyl, obtain the PH sensitive membrane of the carboxylic acid of EVA/PSMA-H, otherwise carboxyl is combined with sodium ion, and aperture reduces, and membrane flux reduces.Due to the existence of carboxyl, the film of this carboxylic acid shows preferable PH sensitivity.Under conditions of PH=5, PH sensitivity semipermeable membrane permeability rate is maximum.EVA semipermeable membrane modified for PSMA of the present invention is greatly improved its PH sensitivity in the case of the mechanical property not reducing film.PSMA/EVA semipermeable membrane prepared by the present invention is a kind of loose structure, and this structure imparts the water permeability that semipermeable membrane is excellent.PH sensitivity semipermeable membrane of the present invention can be used for medicament slow release, and under the conditions of specific PH, molecule transmitance is different, makes little molecule to pass through, retains macromole, obtains after tested respectively may be about 2 ~ 4 μm and 0.5 ~ 2 μm through basic hydrolysis membrane aperture before and after pickling.Response time is short, and preparation technology is simple, can carry out commercial production in a large number, to human non-toxic's side effect.
The method increasing the functional groups of EVA film with styrene-maleic anhydride copolymer (PSMA), utilize miscible legal preparation PH responsive type semipermeable membrane altogether, it can be according to extraneous PH change, pore size changes, cause the change of permeability rate, make corrosion inhibiter reach the release action of " on-off ".
Description of the invention and application are illustrative, are not wishing to limit the scope of the invention in above-described embodiment.The deformation of embodiments disclosed herein and change are possible, and for those skilled in the art, embodiment is replaced and the various parts of equivalence are known.It should be appreciated by the person skilled in the art that in the case of without departing from the spirit or essential characteristics of the present invention, the present invention can otherwise, structure, layout, ratio, and realize with other elements, material and parts.
Claims (4)
1. a pH value sensor, it is characterized in that, including shielding shell, it is provided with rubber gasket sheet in shielding shell and housing is separated into upper chamber and lower chambers, being provided with processing unit in upper chamber, described processing unit includes the microprocessor module that the A/D modular converter that the Signal-regulated kinase that circuit board is connected is connected with Signal-regulated kinase is connected with A/D modular converter and the power management module being connected with microprocessor module with circuit board；Bottom chamber is provided with PH electrode, PH electrode includes reference electrode, measures electrode, reference electrode is copper sulfate electrode and is independently disposed to bottom chamber, measuring electrode to be made up of the PH sensitivity semipermeable membrane of glass chamber with the sheet metal being arranged in glass chamber and covering sheet metal, the shielding line that the sheet metal of measurement electrode is insulated by height is connected with circuit board；PH sensitivity semipermeable membrane is welded on sheet metal by shielding line and draws in shielding shell；Microprocessor module is also associated with radio receiving transmitting module, and radio receiving transmitting module communication connection has gtw gprs, and microprocessor module is connected to be positioned at the computer of terminal and mobile device by gtw gprs communication link.
A kind of pH value sensor the most according to claim 1, it is characterised in that the measurement electrode tip stretched out outside shielding shell is socketed with protective cover, and protective cover is copper drainage screen.
A kind of pH value sensor the most according to claim 1, it is characterised in that sheet metal is become by silver or the copper of good conductivity.
A kind of pH value sensor the most according to claim 1, it is characterised in that shielding shell is metal-back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194104.XA CN105823811A (en) | 2016-03-31 | 2016-03-31 | pH value sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194104.XA CN105823811A (en) | 2016-03-31 | 2016-03-31 | pH value sensor |
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| Publication Number | Publication Date |
|---|---|
| CN105823811A true CN105823811A (en) | 2016-08-03 |
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| CN201610194104.XA Pending CN105823811A (en) | 2016-03-31 | 2016-03-31 | pH value sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107084981A (en) * | 2017-06-21 | 2017-08-22 | 中国海洋大学 | The high-precision pH sensors of acid-base indicator photometry are sustained based on nano material |
| CN110709004A (en) * | 2017-06-07 | 2020-01-17 | 三星医疗财团 | PH measuring device and PH monitoring system comprising same |
| DE102018132225A1 (en) * | 2018-12-14 | 2020-06-18 | Endress+Hauser Conducta Gmbh+Co. Kg | Electrochemical measuring cell |
-
2016
- 2016-03-31 CN CN201610194104.XA patent/CN105823811A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110709004A (en) * | 2017-06-07 | 2020-01-17 | 三星医疗财团 | PH measuring device and PH monitoring system comprising same |
| US11647943B2 (en) | 2017-06-07 | 2023-05-16 | Samsung Medical Center | PH measuring device and pH monitoring system including same |
| CN110709004B (en) * | 2017-06-07 | 2023-10-20 | 三星医疗财团 | PH measuring device and PH monitoring system comprising same |
| CN107084981A (en) * | 2017-06-21 | 2017-08-22 | 中国海洋大学 | The high-precision pH sensors of acid-base indicator photometry are sustained based on nano material |
| CN107084981B (en) * | 2017-06-21 | 2023-06-16 | 中国海洋大学 | High-precision pH sensor based on nanomaterial sustained-release acid-base indicator photometry |
| DE102018132225A1 (en) * | 2018-12-14 | 2020-06-18 | Endress+Hauser Conducta Gmbh+Co. Kg | Electrochemical measuring cell |
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Application publication date: 20160803 |
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