CN106442680A - Calibration method for portable electrochemical-process dissolved oxygen meter - Google Patents
Calibration method for portable electrochemical-process dissolved oxygen meter Download PDFInfo
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- CN106442680A CN106442680A CN201610992438.1A CN201610992438A CN106442680A CN 106442680 A CN106442680 A CN 106442680A CN 201610992438 A CN201610992438 A CN 201610992438A CN 106442680 A CN106442680 A CN 106442680A
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- dissolved oxygen
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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
- G01N27/416—Systems
- G01N27/4163—Systems checking the operation of, or calibrating, the measuring apparatus
Abstract
The invention discloses a calibration method for a portable electrochemical-process dissolved oxygen meter. The portable electrochemical-process dissolved oxygen meter comprises an air pressure sensor, an input device, an interface A and an interface B, a film electrode of the dissolved oxygen meter is sequentially connected with an I/U converter, a voltage amplifier, a signal acquiring device and a detector through the interface A, a microprocessor is connected with the air pressure sensor and the detector and used for processing according to atmospheric pressure values measured by the air pressure sensor and electric signals inputted by the detector, a controller is connected with the microprocessor, a constant-current source and the input device and is used for controlling the constant-current source, and the constant-current source is connected with an electric meter portion of the dissolved oxygen meter. The calibration method for the portable electrochemical-process dissolved oxygen meter has the advantages that an electric meter and the electrode can be calibrated respectively, so that the portable electrochemical-process dissolved oxygen meter can be calibrated accurately rapidly without constant-temperature experimental conditions; the portable electrochemical-process dissolved oxygen meter can be calibrated on site without being detached and transported to a laboratory, so that normal production of submitted enterprises is smoothed.
Description
Technical field
The invention belongs to calibration inspection technology field, especially relate to a kind of portable electrochemical method DO determination
Instrument calibration method.
Background technology
The molecular oxygen being dissolved in water is referred to as dissolved oxygen.The dissolved oxygen content of natural water depends on water body and oxygen in air
Balance.The partial pressure of the saturation content of dissolved oxygen and in the air oxygen, atmospheric pressure, water temperature have substantial connection.Dissolved oxygen meter
Of many uses, its calibration method is electrochemical process saturated oxygen solwution method at present, is to make water by having selective oxygen permeation membrane
In dissolved oxygen the electric signal (electric current or current potential) being directly proportional to oxygen concentration is directly produced on electrode again by this electric signal
Amplified, export in instrument readings after conversion and temperature-compensating, this method is contacted with supporting electrolyte using by two
Solid metal electrode composition oxygen sensing film electrode, and the optional membrane that a kind of oxygen molecule can penetrate through will support electricity
Solution matter is separated with test solution.Electrode reaction is：Negative electrode：O2+2H2O+4e→4OH-Anode：Me→Me2++ 2e, between negative electrode and anode
Dissufion current and oxygen molecule concentration consistent, electrode is directly connected with dissolved oxygen meter, and electrode signal can pass through dissolved oxygen
Computer within analyzer is directly changed into the dissolved oxygen concentration in terms of mg/L.This device before use, needs whole to instrument
Body situation carries out calibration it is impossible to the electricity meter module performance of instrument and electrode performance are separately carried out calibration, the result so leading to
If exactly go wrong during calibration cannot be distinguished by electricity meter or the problem of electrode is it is impossible to carry out to instrument performance entirely
Face is investigated.Simultaneously it is necessary to be examined and determine it is desirable to harsh under the laboratory condition of constant temperature and humidity.And saturation water is because calibrating temperature
Degree, the impact of water quality, change big, Uncertainty is very big.
Content of the invention
For solving above-mentioned technical problem, the invention provides a kind of portable electrochemical method dissolved oxygen meter calibrating side
Method.
The complete technical scheme of the present invention includes：
A kind of portable electrochemical method dissolved oxygen meter calibration method is it is characterised in that adopt portable electrochemical method
Dissolved oxygen meter calibrating installation, described device includes baroceptor, input equipment, A interface and B interface, and dissolved oxygen is surveyed
The Film electrode determining instrument connects A interface by conversion, and A interface is sequentially connected I/U converter, voltage amplifier, signal picker, inspection
Survey device；
Microprocessor connects baroceptor, detector and controller, the atmospheric pressure intensity values recording according to baroceptor
Carry out process with the electric signal of detector input and obtain electrode constant, and this constant is sent to controller；
Input equipment connects controller, and controller connects and control constant-current source, and constant-current source connects B interface；B interface passes through to turn
Alias connects the electricity meter part of tested dissolved oxygen meter；Comprise the steps：
1) Film electrode of dissolved oxygen meter is connected with the A interface of calibrating installation by translation interface, tested dissolving
The electricity meter part of oxygen analyzer is connected with the B interface of calibrating installation by translation interface；
2) it is put in the air by after electrode polarization, adopted by the I/U converter of calibrating installation, voltage amplifier and signal
Storage, the micro-current that the Film electrode of dissolved oxygen meter is produced is converted to voltage signal；Voltage signal is through voltage amplifier
After amplification, through signal picker by this signal transmission after amplifying to detector, incoming voltage signal is entered line number by detector
Wordization is processed and incoming microprocessor；
3) magnitude of voltage incoming for detector is reduced to the micro-current on electrode by microprocessor, is passed by baroceptor simultaneously
It is oxygen concentration that the atmospheric pressure entering converses partial pressure of oxygen, calculates electrode constant C value according to the relational expression of micro-current and partial pressure of oxygen,
And C value is preserved, it is sent to controller；Described relational expression is：
In above formula, IdFor electrode current, unit is nA,For saturation partial pressure of oxygen, unit is bar, and C is related to electrode
Constant；
4) input standard oxygen concentration values from input equipment, standard is obtained through formula (I) according to the electrode constant C value obtaining defeated
Go out current value, control constant-current source to export this standard output current value；
5) the electricity meter part display of tested dissolved oxygen meter records oxygen concentration numerical value accordingly, will record oxygen concentration numerical value
Compared with standard oxygen concentration values, according to the requirement of vertification regulation, thus recording the accuracy of tested dissolved oxygen meter
Level.
The present invention is with respect to the advantage of prior art：
Calibrating installation and method, its verification process of the principle simulation according to instrument that the present invention provides, can separate electricity meter
Carry out calibration respectively with electrode, electricity meter and the Targets of electrode can be examined respectively according to the requirement of existing vertification regulation
Examine, thus fast and accurately examining and determine to instrument, further, since calibrating installation output be stable electric signal it is not necessary to
Carry out under conditions of constant temperature, be easy to carry, on-site measurement can be carried out to instrument.
Brief description
Fig. 1 is calibrating installation structural representation disclosed by the invention.
In figure 1 is dissolved oxygen meter, and 2 is calibrating installation, and 3 is Film electrode, and 4 is electricity meter part, and 5 is I/U converter,
6 is voltage amplifier, 7 is signal picker, 8 is detector, and 9 is air gauge, and 10 is microprocessor, and 11 is input equipment, 12
For controller, 13 is constant-current source.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
As shown in figure 1, a kind of portable electrochemical method dissolved oxygen meter calibrating installation, including dissolved oxygen meter 1, examine
Determine device 2, Film electrode 3, electricity meter part 4, I/U converter 5, voltage amplifier 6, signal picker 7, detector 8, air gauge
9, microprocessor 10, input equipment 11, controller 12, constant-current source 13.
The Film electrode of dissolved oxygen meter connects A interface by conversion, will be put in the air after electrode polarization, A interface according to
Secondary connection I/U converter, voltage amplifier, signal picker and detector；I/U converter is micro- for produce electrode reaction
Weak current signal is converted to voltage signal；Voltage amplifier can be by the voltage micro-signal after conversion through amplifying so as to strong layer by layer
Degree reaches the degree that can detect；Signal picker is used for the signal transmission amplified to detector；Detector is by incoming electricity
Pressure signal is digitized processing and incoming microprocessor；
When carrying out data processing, due to being related to the process of current-voltage-amplification-electric current, in order to reduce error, carry
In high precision, processed in the following way：Gather 10 groups of magnitudes of voltage first, be designated as V1To V10, then take that above-mentioned magnitude of voltage
Root mean square average V0, subsequently pass through formulaObtain final magnitude of voltage V, microprocessor is even
Connect baroceptor, detector and controller, final magnitude of voltage incoming for detector is reduced to the micro-current on electrode.Air pressure
Sensor (air gauge) is used for detecting the atmospheric pressure under experimental condition, converses oxygen by the incoming atmospheric pressure of baroceptor
Partial pressure is oxygen concentration (atmospheric pressure and partial pressure of oxygen relation are shown in JJG291-2008 subordinate list).
Following relational expression according to micro-current and partial pressure of oxygen：
In above formula, IdFor electrode current, unit is nA,For saturation partial pressure of oxygen, unit is bar, and C is related to electrode
Constant；
Wherein
In above formula, n is the quantity (n=4) of electron transfer, and F is Faraday constant (F=96.485C/mol), and A is negative electrode table
Size [cm2], D is diffusion coefficient [cm on film for the oxygen molecule2/ s], S is the oxygen solubility [mol/ (cm of film3* bar)],
D is film thickness [cm].
Electrode constant C value is calculated according to above-mentioned formula, and C value is preserved, be sent to controller；
Input equipment connects controller, and controller connects and controls constant-current source, inputs standard oxygen concentration numbers from input equipment
Value, obtains standard output current value according to the electrode constant C value obtaining through formula (I), controls constant-current source to export this standard output electricity
Flow valuve；The electricity meter part display of tested dissolved oxygen meter records oxygen concentration numerical value accordingly, will record oxygen concentration numerical value and mark
Quasi- oxygen concentration numerical value compares, according to the requirement of vertification regulation, thus recording the class of accuracy of tested dissolved oxygen meter.
Embodiment 1
Below by specific embodiment 1, the present invention is further described.
20 DEG C of in the air will be put in, now atmospheric pressure is after the Film electrode polarization of dissolved oxygen meter
101325Pa, partial pressure of oxygen is 21278Pa, and under this partial pressure of oxygen, the concentration of the saturated oxygen aqueous solution is 9.08mg/L, by Current Voltage
The signal transacting such as conversion, amplification, collection, detection, analog-to-digital conversion, and obtain output current 766nA after above-mentioned data processing,
Therefore parameter C value is 3600nA/bar.Standard value 11.26mg/L of 10 DEG C of saturated oxygen aqueous solution is inputted in input equipment, now,
According to the anterior C value preserving, so as to output current is 950nA, now tested instrument shows oxygen to adjustment constant current ource electric current to controller
Concentration value should be 11.26mg/L, if now show value is 11.25mg/L, measure error is -0.01mg/L.In input
Standard value 7.56mg/L of 30 DEG C of saturated oxygen aqueous solution is inputted, now, controller is according to the anterior C value preserving, adjustment in equipment
So as to output current is 638nA, now tested instrument display oxygen concentration value should be 7.56mg/L to constant current ource electric current, if this
When show value be 7.54mg/L, then measure error be -0.02mg/L.
So, compared with by the standard figures and tested dissolved oxygen meter output oxygen partial pressure value of the partial pressure of oxygen inputting, press
According to the requirement of vertification regulation, thus recording the class of accuracy of tested dissolved oxygen meter.
The above, be only presently preferred embodiments of the present invention, not the present invention imposed any restrictions, every according to the present invention
Any simple modification, change and equivalent structure change that technical spirit is made to above example, all still fall within skill of the present invention
In the protection domain of art scheme.
Claims (1)
1. a kind of portable electrochemical method dissolved oxygen meter calibration method is it is characterised in that adopt portable electrochemical method molten
Solution oxygen analyzer calibrating installation, described device includes baroceptor, input equipment, A interface and B interface, DO determination
The Film electrode of instrument connects A interface by conversion, and A interface is sequentially connected I/U converter, voltage amplifier, signal picker, detection
Device；
Microprocessor connects baroceptor, detector and controller, the atmospheric pressure intensity values recording according to baroceptor and inspection
The electric signal of survey device input carries out process and obtains electrode constant, and this constant is sent to controller；
Input equipment connects controller, and controller connects and control constant-current source, and constant-current source connects B interface；B interface is connect by conversion
Mouth connects the electricity meter part of tested dissolved oxygen meter；Comprise the steps：
1) Film electrode of dissolved oxygen meter is connected with the A interface of calibrating installation by translation interface, tested dissolved oxygen is surveyed
The electricity meter part determining instrument is connected with the B interface of calibrating installation by translation interface；
2) it is put in the air by after electrode polarization, by the I/U converter of calibrating installation, voltage amplifier and signals collecting
Device, the micro-current that the Film electrode of dissolved oxygen meter is produced is converted to voltage signal；Voltage signal is put through voltage amplifier
After big, through signal picker by this signal transmission after amplifying to detector, incoming voltage signal is carried out numeral by detector
Change and process and incoming microprocessor；
3) magnitude of voltage incoming for detector is reduced to the micro-current on electrode by microprocessor, simultaneously incoming by baroceptor
It is oxygen concentration that atmospheric pressure converses partial pressure of oxygen, calculates electrode constant C value according to the relational expression of micro-current and partial pressure of oxygen, and will
C value preserves, and is sent to controller；Described relational expression is：
In above formula, IdFor electrode current, unit is nA,For saturation partial pressure of oxygen, unit is bar, and C is related to electrode normal
Number；
4) input standard oxygen concentration values from input equipment, standard output electricity is obtained through formula (I) according to the electrode constant C value obtaining
Flow valuve, controls constant-current source to export this standard output current value；
5) the electricity meter part display of tested dissolved oxygen meter records oxygen concentration numerical value accordingly, will record oxygen concentration numerical value and mark
Quasi- oxygen concentration numerical value compares, according to the requirement of vertification regulation, thus recording the class of accuracy of tested dissolved oxygen meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610992438.1A CN106442680B (en) | 2016-11-11 | 2016-11-11 | A kind of portable electrochemical method dissolved oxygen meter calibration method |
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| CN201610992438.1A CN106442680B (en) | 2016-11-11 | 2016-11-11 | A kind of portable electrochemical method dissolved oxygen meter calibration method |
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| CN106442680B CN106442680B (en) | 2018-07-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108956927A (en) * | 2018-09-21 | 2018-12-07 | 中国科学院电工研究所无锡分所 | A kind of high-precision dissolved oxygen detection device |
| CN110823976A (en) * | 2019-11-28 | 2020-02-21 | 河南省计量科学研究院 | Microbial membrane electrode method BOD analyzer calibration method |
| CN114983401A (en) * | 2022-04-20 | 2022-09-02 | 北京秋满实医疗科技有限公司 | Sensor for measuring the transcutaneous partial pressure of oxygen at a body part of a patient |
Citations (5)
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|---|---|---|---|---|
| US4900422A (en) * | 1988-07-05 | 1990-02-13 | Bryan Avron I | System for monitoring and reporting the operability and calibration status of a dissolved oxygen sensor |
| WO2003054537A1 (en) * | 2001-12-19 | 2003-07-03 | Honeywell International Inc. | System and method for the determination of dissolved oxygen in a fluid |
| CN101183087A (en) * | 2007-12-27 | 2008-05-21 | 中国计量科学研究院 | Trace quantity dissolved oxygen instrument test calibration system and calibrate method thereof |
| CN104807862A (en) * | 2015-04-20 | 2015-07-29 | 中国农业大学 | Method and device for detecting dissolved oxygen in water |
| CN105424769A (en) * | 2015-11-09 | 2016-03-23 | 北京华科仪科技股份有限公司 | Trace dissolved oxygen tester on-line calibrating device and calibration method thereof |
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2016
- 2016-11-11 CN CN201610992438.1A patent/CN106442680B/en not_active Expired - Fee Related
Patent Citations (5)
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|---|---|---|---|---|
| US4900422A (en) * | 1988-07-05 | 1990-02-13 | Bryan Avron I | System for monitoring and reporting the operability and calibration status of a dissolved oxygen sensor |
| WO2003054537A1 (en) * | 2001-12-19 | 2003-07-03 | Honeywell International Inc. | System and method for the determination of dissolved oxygen in a fluid |
| CN101183087A (en) * | 2007-12-27 | 2008-05-21 | 中国计量科学研究院 | Trace quantity dissolved oxygen instrument test calibration system and calibrate method thereof |
| CN104807862A (en) * | 2015-04-20 | 2015-07-29 | 中国农业大学 | Method and device for detecting dissolved oxygen in water |
| CN105424769A (en) * | 2015-11-09 | 2016-03-23 | 北京华科仪科技股份有限公司 | Trace dissolved oxygen tester on-line calibrating device and calibration method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 张宝珠 等: "从溶解氧测定仪原理解读其校准和检定", 《中国计量》 * |
| 徐远远 等: "JJG291_2008_覆膜电极溶解氧测定仪_检定规程解读", 《中国计量》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108956927A (en) * | 2018-09-21 | 2018-12-07 | 中国科学院电工研究所无锡分所 | A kind of high-precision dissolved oxygen detection device |
| CN110823976A (en) * | 2019-11-28 | 2020-02-21 | 河南省计量科学研究院 | Microbial membrane electrode method BOD analyzer calibration method |
| CN114983401A (en) * | 2022-04-20 | 2022-09-02 | 北京秋满实医疗科技有限公司 | Sensor for measuring the transcutaneous partial pressure of oxygen at a body part of a patient |
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| CN106442680B (en) | 2018-07-06 |
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