CN102788826A - Primary battery type trace oxygen analyzer - Google Patents
Primary battery type trace oxygen analyzer Download PDFInfo
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- CN102788826A CN102788826A CN2012103061351A CN201210306135A CN102788826A CN 102788826 A CN102788826 A CN 102788826A CN 2012103061351 A CN2012103061351 A CN 2012103061351A CN 201210306135 A CN201210306135 A CN 201210306135A CN 102788826 A CN102788826 A CN 102788826A
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Abstract
The invention discloses a primary battery type trace oxygen analyzer. An electrolytic cell is connected with a primary battery in series, and a detection gas circuit is in parallel connected with a bypass pressure regulator after entering into a channel; when the gas flows through a bypass gas circuit, a gas circuit is washed, stabilizing pressure needed by the detection gas circuit is produced, and the surplus gas in the bypass is discharged by a vent nozzle. The electrolytic cell is provided with a matched water storing and replenishing device, and a liquid level of an alkaline liquor in the electrolytic cell is controlled in a specified marked line. The primary battery and the electrolytic cell can regularly work for a long time. A gas outlet of the primary battery is connected with a micro-motion safety device in series, and the gas is exhausted from the gas outlet to prevent the alkali liquor from staining and damaging a detection gas circuit system due to unexpected backstreaming when the pressure at the gas outlet of the primary battery is excessive. With the adoption of the primary battery type trace oxygen analyzer, the trace oxygen in various industrial gas can be quickly detected, the industrial gas on line detection is carried out, multiple other trace oxygen analyzers are simultaneously detected when the primary battery type trace oxygen analyzer is used as an calibration instrument, and the oxygen standard gas in the range of 2-50PPMv is checked and compared; and the primary battery type trace oxygen analyzer has the effects of convenient and quick to use, and the comparison result is accurate and reliable.
Description
Technical field
The present invention relates to the analysis and detecting instrument of micro amount of oxygen in a kind of industrial gasses, the particularly a kind of primary element amount of declining oxygen analyzer.
Background technology
Micro amount of oxygen in the primary element detected gas has long history, and the basis that its metering is traced to the source is very firm, and sensitivity is very high, because the oxygen that directly takes place with electrolysis carries out calibration, testing result is very accurate, and this is that other method is difficult to compare.So long-term next, be the topmost method of micro amount of oxygen in the detected gas, and as the typing instrument, since the fifties, many decades has been continued to use in a plurality of at home fields always always.But because long-term existence great defective, primary element unreasonable structure for example, air flow system is too simple, in the use electrolytic solution and pond in the loss of the moisture content in the alkali lye very fast, cause service time too short, thereby necessary frequent replacing alkali lye.And whenever changing an alkali lye needs could normally use for a long time, and this has just hindered the service efficiency of primary element method greatly.Between oxygen content and output signal, exist nonlinear relationship in particularly detecting, thereby for many years, reometer is adopted in the content demonstration always, thereby has directly had influence on the degree of accuracy of testing result.Too simply detect gas circuit and simple and crude display packing, restricted the lifting of instrumental function.During the last ten years, be accompanied by the fast development of domestic industry gas generation, to the requirement of oxygen amount detection technique; Also increasingly high, cause this quasi-instrument can't be competent at the detection demand, particularly last decade of gas products; A large amount of introductions along with external fuel cell; Original instrument is soon by the market of fading out, thereby domestic fixed point factory, also changes the line of production thereupon.Though the primary element oxygen determination as a kind of method, still has many people continuing to use,, improving in research.But there are not a kind of good industrial products to ask the city so far.We are to both at home and abroad, after particularly domestic gas industry developments is analyzed, think primary element oxygen determination technology potential bright development prospect, its existing defective can overcome.And the technical characterstic that primary element is possessed self through discovering and using, just necessarily can be used as the multifunctional accurate equipment that a kind of novel micro amount of oxygen detects and calibrates, glittering entering the market.
Fuel cell also is that because it does not have liquid, highly sensitive, volume is again little, and is easy to use by the primary element development, thereby obtains the large tracts of land popularization very soon, has promoted the development of oxygen analytical technology.But fuel cell can not substitute primary element, and the two is the relation of mutual restriction by no means, and is opposite; But be to replenish each other, promote the relation of supporting development mutually; Thereby the new product of primary element oxygen analyzer, one promotes Chinese micro amount of oxygen detection technique surely, the higher step of marching toward.
The detection process of gas path (main frame) of traditional primary element formula oxygen analyzer industrial products is shown in Figure 1 like annex one, detects gas circuit and is made up of flow control valve 1, flowmeter 2, common four-way valve 3, micro electrolytic cell 4 and primary element 5.The primary element anode is a silver net 6, and negative electrode is a lead rod 7, places far apart alkali liquor container respectively, and oxygen content is used the common current table, representes by non-linear calibration.Its major defect is following: one, the moisture content in electrolytic cell and the primary element alkali lye runs off comparatively fast in detection, causes the instrument work period short; Two, instrumental sensitivity is low, responds slowlyer, and detection time is longer; Three, demonstration is extensive, and it is bigger to detect error; Four, four-way valve poor air-tightness, testing result is subject to the influence of air oxygen; Five, the alkali lye replacing is more frequent, and complex operation not only directly influences service efficiency, and alkali lye also damages equipment and operator easily.
Summary of the invention
The present invention is directed to the problem that the existing primary element amount of declining oxygen analyzer exists; A kind of ability long-term stable operation is provided; The fast detecting that can be used for micro amount of oxygen in the multiple industrial gasses; Be used for the online detection of industrial gasses, be used for other trace oxygen analyzer of verification, particularly can be used for the primary element amount of the declining oxygen analyzer of the checksum verification of a large amount of bottled oxygen standard gas.
A kind of primary element amount of declining oxygen analyzer; Its parts electrolytic cell and primary element series connection; It detects gas circuit admission passage parallel connection one bypass pressure regulator, when gas flows through in the bypass gas circuit, gas pipeline is cleaned; And producing the required steady pressure of detection gas circuit work, the unnecessary gas of bypass is discharged through drain.
The described primary element amount of declining oxygen analyzer, its electrolytic cell has supporting water, water replanishing device, and the liquid level of alkali lye is controlled in the regulation graticule in the electrolytic cell, and electrolytic cell can long-term operate as normal.
Its primary element gas vent fine motion safety of connecting, when the primary element gas outlet pressure was excessive, gas was discharged from here, prevented the unexpected anti-stream of alkali lye, polluted and damaged electrical equipment and circuit.
Antireflux fine motion safety is a Qian shape fold-type pipe, and an end connects the primary element gas vent, another road and atmosphere, and a small amount of seal fluid is arranged at fold-type pipeline bottom.When surpassing certain pressure, gas is emptying from here, anti-flow phenomenon can not take place.
Its four-way valve that detects in the gas circuit is the conical surface four-way valve of anti-highly basic, can prevent that oxygen gets into system in the air, influences testing result.
The described primary element amount of declining oxygen analyzer, it detects air-channel system and detection circuitry respectively is a standalone chassis, pollutes Circuits System to prevent alkali lye.
The top of detection system cabinet and two side are transparent material, convenient electrolytic cell and the primary element working condition of observing.
What it detected the series connection of gas circuit admission passage is mass flowmeter, is used for the content that oxygen takes place is carried out intelligent computing.
It detects on the gas circuit and is connected with degasifier through a four-way valve, when being used for instrument school zero-sum generation electrolysis oxygen, removes the micro amount of oxygen in the appearance of degassing in advance.
The described primary element amount of declining oxygen analyzer, its oxygen content show employing digital intelligent touch-screen, to reduce panel button.
Show various test items on the touch-screen, and related data.Which project the finger point touches, and the data of which project can show in redirect.
The detection principle of this method and apparatus is:
The end of instrument detecting flow process is a primary element, and this pond is that tower structure is up-small and down-big, and negative electrode in the pond and anode are coaxial-type; The inwall negative electrode adopts the porous lead foil, and the outer wall anode is silver-colored net, rebasing harmonizing yinyang two interpolars of negative electrode; Be high-quality filter paper, the filter paper lower end is immersed in the alkali lye, and negative and positive the two poles of the earth then place the updraft passage; When containing the entering of oxygen appearance gas, reactions promptly takes place in the primary element.
Anode: O
2+ 2H
2O+4e → 4OH
-
Negative electrode: 2Pb+4OH
-→ 2Pb (OH)
2+ 4e
Behind the external load of the two poles of the earth, in load, can obtain with gas appearance in the corresponding signal of oxygen content, signal can directly show oxygen content value C in the gas appearance to be detected through after the digitized processing.The maximum characteristics of this primary element are that responding fast shows and stablize that the life-span is long.
Set electrolytic cell is the column pond before primary element, and the below, pond is a reservoir, fills the KOH WS of 40mL in the groove, on the gas channel of solution top, is provided with externally-wound type electrolytic cell core.When gas appearance was detected, gas was with 100mL/min
Constant flow flows out from alkali lye, flows out electrolytic cell entering primary element through gas channel again and carries out the oxygen content detection.When appliance requires carries out calibration, only need open the direct supply that is applied on electrolysis core the two poles of the earth, have in suction on the electrolytic cell core of moisture content, promptly electrolytic reaction can take place, its reaction equation is:
H
2OH
2↑+O
2↑
The oxygen that is taken place is evenly distributed in the gas appearance of 100mL/min anaerobic (gas at zero point), and gets into the primary element reaction and produce corresponding electric signal.
Permanent gases is under the imposing a condition of 100mL/min flow, and according to Faraday's law, the oxygen of every generation 1PPMv, its corresponding Faradaic current are 26.8 μ A.Therefore, measure electric current and can know oxygen content.Electrolytic process is a kind of absolute method, under rated condition, self is exactly a kind of standard.
Regulate Faradaic current easily through regulating the big I of outer load; Make electrolytic cell produce with tested gas in the identical or close electrolysis oxygen of oxygen content; With this as detecting calibration; Could eliminate the influence of nonlinear relationship in the measurement to greatest extent, accurately verification measurement data obtains micro-oxygen content in the tested accurately gas.The thinking of this method and effect have surpassed traditional detecting instrument, have solved the inaccurate problem of existing instrument detecting.But be used for≤during the conventional sense of 15 PPMV oxygen contents, only need to mark oxygen content and be transferred to 10PPMv and get final product.
Therefore the present invention can be used as calibration instrument because it is accurate, quick, by same gas appearance, and many other trace oxygen analyzers of verification simultaneously.
The more important thing is that the degree of accuracy of its detection is enough to make it to carry out verification, comparison to micro amount of oxygen standard gas, therefore greatly promoted the functions of use of this detecting instrument, make it to step into the field of high-accuracy micro amount of oxygen detecting instrument.
During accurate the detection, answer the capable detection of advanced promoting the circulation of qi sample, recording the oxygen content value is C1.Then four-way valve (14) is forwarded to " school zero " position, connect the deoxidation pipe, press " school zero " key, school zero.Press " mark oxygen " key then, and turn " adjusting of oxygen amount ", make displayed value equal C1, this is the electrolysis oxygen content.Press " calibration " key afterwards again, this moment, instrument was not C1 as if what show, then regulated " verification " key, and making displayed value is C1, and this is the displayed value of primary element, is the indicating value after the calibration.After the calibration, be worth after being the instrument self-correcting.Press " mark oxygen " key and " calibration " key then, recover normally to detect, at this moment, the C1* of displayed value again of instrument promptly is the gas appearance oxygen level after proofreading and correct.
In the instrument self-correcting, comprised instrument school zero, therefore do not needed to return to zero separately again.
One, this primary element amount of declining oxygen analyzer can
(1) is used for the fast detecting of multiple industrial gasses micro amount of oxygen;
(2) be used for the online detection of industrial gasses;
(3) as calibration instrument, many other trace oxygen analyzers of verification simultaneously;
(4) be used for the oxygen standard gas in the 2-50PPMv is verified, compared, easy to use, quick, comparison result accurately and reliably.
Two, its bypass modulator, can:
(1) quickens the elimination that gas appearance is polluted;
(2) working pressure of accurate control detection device;
(3) make detection flow invariable under setting (100mL/min), with the degree of accuracy of guaranteeing to detect.
(4) have over-voltage protecting function, can prevent that the hyperbaric atmosphere stream that misoperation produces from damaging air-channel system.
Three, antireflux fine motion safety can
(1) prevent that the primary element gas outlet pressure is excessive, cause the unexpected anti-stream of alkali lye, stained detection system, pipeline and parts cause shutting down;
(2) prevent that oxygen infiltrates primary element from the safety floss hole in the air, influence testing result.
Four, the conical surface four-way valve of its anti-highly basic can guarantee that system does not receive the influence of air oxygen.
Five, its detection system and detection circuitry are separately positioned in mainframe box and the electric cabinet, pollute electrical system to prevent alkali lye.
Six, the tripartite transparent material that adopts in main frame top and two sides, convenient electrolytic cell and the primary element working condition of observing.
Seven, it detects flow metering and adopts mass flowmeter, is convenient to automatic, the accurately computing of oxygen content.
Below in conjunction with accompanying drawing, again foregoing of the present invention is done further to specify through the embodiment of embodiment.But should this scope that is interpreted as the above-mentioned theme of the present invention only not limited to following examples.Under the situation that does not break away from the above-mentioned technological thought of the present invention, various replacements or change according to ordinary skill knowledge and customary means are made all should be included in protection scope of the present invention.
Description of drawings
Fig. 1 is the testing process figure of the traditional primary element amount of declining oxygen analyzer.
Fig. 2 is the testing process figure of the primary element amount of declining oxygen analyzer of the present invention.
Embodiment
Embodiment
Gas appearance is divided into two-way after getting into and detecting gas circuit, and one the tunnel through safety valve 8, and tensimeter 9, bypass modulator 10 provide the working pressure of assisting gas, then after flowmeter 11 meterings, from bypass outlet emptying.
Another road is through measuring flow control valve 12, and mass flowmeter 13, four-way valve 16, electrolytic cell 17 get into primary element 18, and gets into four-way valve 16 by the primary element outlet, and tail gas is through measuring outlet emptying.Connect a fine motion safety 21 on the primary element exit passageway.Electrolytic cell 17 has supporting water, water replanishing device hopper 20 and switch valve 19.The oxygen content value is C1 (oxygen content that primary element detects) in the instrument detecting gas appearance.
During calibration, four-way valve 14 is forwarded to " school zero " position, be communicated with degasifier 15, press " school zero " key, make to be shown as zero.Press " mark oxygen " key then, turn gently " adjusting of oxygen amount " makes to show that numerical value is C1, and this value is the electrolysis oxygen content of electrolytic cell.Press " calibration " key then, be not C1 as if what show this moment, then transfers checker, and making displayed value is C1 (this is the displayed value of primary element, is to be worth after the instrument self-correcting).
Press " mark oxygen " key, press " calibration " key, recover normal gas circuit and detect, measure oxygen content in the gas to be measured again.The measured value that show this moment is the oxygen content C1* in the accurate gas appearance.
This method can be eliminated the various errors of instrument to greatest extent, and accurately verification measurement data obtains industrial gasses micro-oxygen content testing result accurately.
The advantage of this device:
1, attainable new technology index of instrument and application function
The key technical indexes
1.1 detect lower limit 0.02PPMv
1.2 repeatability: during oxygen amount>=10PPMv ,≤± 0.5%
1.3 the oxygen occurrence scope, arbitrary steady state value in the 2-50PPMv.
2, the special primary element amount of declining oxygen detection, fast, sensitivity, the life-span is long;
The oxygen demarcated can take place in 3, special electrolytic cell, and make-up solution automatically;
4, split type cabinet, transparent main frame can be observed at any time and control electrolytic cell and primary element working condition;
5, instrument is safe in utilization, reliable, detection quick (1 ~ 2 minute), accurate.
Instrument is mainly used in the micro amount of oxygen in the gas that online or discontinuity detection high-purity gas nitrogen, argon, hydrogen and industrial ethylene and other do not react with alkali lye.
Claims (10)
1. the primary element amount of declining oxygen analyzer; Its parts electrolytic cell and primary element series connection; It is characterized in that: detect gas circuit admission passage parallel connection one bypass pressure regulator, when gas flows through in the bypass gas circuit, the gas gas pipeline is cleaned; And producing the required steady pressure of detection gas circuit work, the unnecessary gas of bypass is discharged through drain.
2. trace oxygen analyzer as claimed in claim 1 is characterized in that: the primary element gas vent also connects a fine motion safety, and when the primary element gas outlet pressure was excessive, gas was discharged from here, prevents the unexpected anti-stream of alkali lye, stained detection system.
3. trace oxygen analyzer as claimed in claim 1 is characterized in that: the electrolytic cell that produces scalar oxygen has supporting water, water replanishing device, and the liquid level of alkali lye is controlled in the regulation graticule in the electrolytic cell, and electrolytic cell can long-term operate as normal.
4. trace oxygen analyzer as claimed in claim 1; It is characterized in that: in its electrolytic cell in concentration of lye and the primary element concentration of lye identical; The appearance gas through electrolytic cell by humidification after, when passing through primary element again, neither can take away the moisture content in the primary element alkali lye; Also can wetly condensation not get off, primary element alkali lye liquid level remains unchanged for a long time.
5. trace oxygen analyzer as claimed in claim 1 is characterized in that: the four-way valve that detects in the gas circuit is the high-air-tightness conical surface four-way valve of anti-highly basic, can prevent that oxygen gets into system in the air, influences testing result.
6. trace oxygen analyzer as claimed in claim 1 is characterized in that: testing circuit places respectively in the different cabinets with the detection gas circuit, damages electrical equipment and circuit to prevent that alkali lye from polluting.
7. trace oxygen analyzer as claimed in claim 5 is characterized in that: the top board and the biside plate that detect the air-channel system cabinet are transparent material, convenient electrolytic cell and the primary element working condition of observing.
8. trace oxygen analyzer as claimed in claim 1 is characterized in that: measure the calculating of flow, adopt mass flowmeter.
9. trace oxygen analyzer as claimed in claim 1 is characterized in that: detect the four-way valve that is in series with the band degasifier on the gas circuit, be used for instrument school zero.
10. like one of claim 1-5 or 7 or 8 described trace oxygen analyzers, it is characterized in that: its oxygen content display screen is the digital intelligent touch-screen.
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| CN2012103061351A CN102788826A (en) | 2012-08-27 | 2012-08-27 | Primary battery type trace oxygen analyzer |
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|---|---|---|---|
| CN2012103061351A CN102788826A (en) | 2012-08-27 | 2012-08-27 | Primary battery type trace oxygen analyzer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064273A (en) * | 2016-12-29 | 2017-08-18 | 天津森罗科技股份有限公司 | A kind of portable oxygen tester that declines |
| CN110133193A (en) * | 2019-05-23 | 2019-08-16 | 山东省计量科学研究院 | Portable micro oxygen analyzer calibrating apparatus and method |
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| GB1057753A (en) * | 1964-05-19 | 1967-02-08 | Ian Melville Clark | Oxygen analyzer |
| US3788310A (en) * | 1970-03-25 | 1974-01-29 | Westinghouse Electric Corp | Flow control apparatus |
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2012
- 2012-08-27 CN CN2012103061351A patent/CN102788826A/en active Pending
Patent Citations (8)
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| GB1057753A (en) * | 1964-05-19 | 1967-02-08 | Ian Melville Clark | Oxygen analyzer |
| US3788310A (en) * | 1970-03-25 | 1974-01-29 | Westinghouse Electric Corp | Flow control apparatus |
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| Title |
|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064273A (en) * | 2016-12-29 | 2017-08-18 | 天津森罗科技股份有限公司 | A kind of portable oxygen tester that declines |
| CN110133193A (en) * | 2019-05-23 | 2019-08-16 | 山东省计量科学研究院 | Portable micro oxygen analyzer calibrating apparatus and method |
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Application publication date: 20121121 |