CN202735296U - Gas sensor calibration device - Google Patents
Gas sensor calibration device Download PDFInfo
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- CN202735296U CN202735296U CN 201220387657 CN201220387657U CN202735296U CN 202735296 U CN202735296 U CN 202735296U CN 201220387657 CN201220387657 CN 201220387657 CN 201220387657 U CN201220387657 U CN 201220387657U CN 202735296 U CN202735296 U CN 202735296U
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Abstract
The utility model relates to a gas sensor calibration device, which is formed by connection of a gas concentration regulating module and a gas sensor detection module in series. The gas concentration regulating module consists of a gas chamber, a plurality of valves, a gas pump and a quantitative gas regulator which form a circulating gas channel, the gas pump is connected with the quantitative gas regulator in series, two ends of the gas pump are connected with the gas chamber through the valves, and two additional ports of the gas chamber are respectively connected with the gas sensor detection module and a gas sample through valves; wherein a quantitative chemical reactor is adopted as the quantitative gas regulator and comprises solid chemical reagents, solution, test paper, porous absorbing materials and the like for selective reaction with components to be tested in the gas sample. Changes of the gas concentration can be measured and controlled through chemical reaction.
Description
Technical field
The present invention relates to the caliberating device of gas sensor
Background technology
What material concentration is measured general using with sensor is incidence relation between sensor response and test substance concentration.And the zero point of sensor and sensitivity in use can be drifted about inevitably.In order to obtain more accurately measured value, before generally all requiring to measure sensor is demarcated.(as less demanding to accuracy of measurement, then in the certain error allowed band, can suitably relax spot frequency.)
Demarcation need to be measured sensor with the standard substance of concentration known, and for liquid, solid matter, the acquisition of standard substance concentration is relatively easy, generally passes through the analytical balance weighing in the laboratory, and the volumetric flask constant volume just can be accomplished.And the acquisition of the calibrating gas of low concentration is bothered relatively, generally all need by buying to the calibrating gas supplier who obtains China Metrology Accreditation.
Calibrating gas supplier is the weight method preparing calibrating gas of adopting international standards tissue recommendation generally, to the gas of low concentration owing to there being the problem such as adsorption equilibrium, need calibration check before dispatching from the factory, the conventional method of its check is gas chromatographic technique, and gas chromatography also needs the calibrating gas of higher level to demarcate, the problem that propagation of error is arranged here, in addition, calibrating gas dispatches from the factory rear because absorption, the factors such as infiltration can make its concentration continue to change, and the client is difficult for discovering to this variation.Non-type with this such as the client " Standard Gases " calibrated sensor measures inaccurate beyond doubt.
Even the demarcation to sensor is accurately, if sensor large (humiture and interference gas etc.) affected by environment, the difference of condition also can be introduced larger error during measurement and calibration.A method of dealing with problems is the characteristics according to sensor, temperature to sensor, humidity, the Characteristic Compensation of Medical Sensors such as pressure, the method can improve the accuracy of sensor measurement within the specific limits, but to the consistance of sensor performance, have relatively high expectations (prerequisite of compensation is that the above-mentioned characteristic of sensor does not change with environmental evolution in time) of stability.
Chemical analysis method can provide a kind of absolute measurement standard, but in order to obtain accurately the often a large amount of gas of needs of analysis result, even can exhaust whole bottle gas, is there there simpler absolute standard method?
US Patent No. 4829809 (Citytech 1989) has disclosed a kind of gas electrolytic analysis apparatus and method, it places an electrochemical sensor cavity of known volume, at first pass into the gas to be measured of unknown concentration in the cavity, timing signal seals cavity, owing to sensor consumes gas its response is constantly reduced, according to the Farady law, its electric current is decayed with exponential form, according to sensor current temporal evolution curve, sensor initial response electric current, cavity volume can be found the solution transducer sensitivity and gas concentration.But the value of this patent has been to provide a kind of just method of measure gas concentrations of transducer sensitivity that need not to know, but the method that this patent adopts is that gas in the cavity is carried out electroanalysis, the gas incomplete mixing can cause larger measuring error in the cavity, in addition, owing to employing in computation process is transient current, very high to the sensor signal quality requirements, very little measurement current error all can cause larger calculation deviation, thereby is not suitable for the light concentration gas detection.In fact, the method is not used at large.
US Patent No. 4833909 (Dragger, 1989) has been described a kind of similar coulometry device.
US Patent No. 6055840 (Industrial Scientific corporation, 2000) a kind of method of finding the solution gas concentration by quantitative adjusting control gas diffusion paths resistance has been described, the method need to be known the coefficient of diffusion of gas to be measured and the physical size of at least one gas diffusion paths, thereby practical application is also inconvenient.
Honeywell discloses the patent (US7975525B2 of multinomial transducer calibration and self-calibrating method recent years, US7661290B2, US2006/0266097A1, US2005/0262924A1, US7401493B2, US7581425B2, US7655186B2, US7071386B2, US6918281, US2006/0042351A1), Drager also discloses several transducer calibration patent (US7704356B2 recently, US7645362B2), a common ground of these patents is exactly that they all need calibrating gas, and the method that just produces calibrating gas is had nothing in common with each other.Integrate electrochemical gas generator such as US7645362B2, US7645362B2, US2005/0262924A1 in gas circuit or sensor; US7975525B2 connects a gas concentration modulating device and is used for gas pre-concentration and analytic signal modulation (carrying out the baseline correction) in gas circuit, gas circuit connects standard gas generating apparatus for Demarcate Gas simultaneously; US7661290B2 is stored in calibrating gas in the one parcel mounted box, is convenient to rolling and carries, and timing signal punctures packing and is used for transducer calibration etc. in the cavity that releases the gas into fixed volume.
Summary of the invention
The deficiency that the present invention is directed to present technology has proposed a kind of device that sensor is carried out on-site proving.It thes contents are as follows:
This device is composed in series by gas concentration adjusting module and gas sensor detection module, described gas concentration adjusting module is by air chamber, valve, air pump, the gasometry adjuster forms the circulation gas circuit, air pump is connected with air chamber by valve with the rear two ends of gasometry adjuster series connection, and two other port of described air chamber connects gas sensor detection module and sample gas by valve respectively.
The above-mentioned gas metering control is quantitative chemical reactor, comprise solid chemicals, solution, test paper, the porous adsorbing material that can carry out with component to be measured in the sample gas selective reaction in this reactor, by chemical reaction measure control gas concentration variable quantity.
Above-mentioned air chamber is comprised of elongate conduit, and the vertical two ends of pipeline are connected with sample gas with the gas sensor detection module by valve, and described elongate conduit laterally is connected with valve in the described gas concentration adjusting module respectively by capillary array.
Above-mentioned air chamber also can be the air chamber of elongate conduit and moveable piston.
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This section deletion.
The present invention has disclosed a kind of device that directly sensor is carried out on-site proving with sample gas, overcome the impact of sensor signal drift, humiture and part interference gas, thereby improve the Stability and dependability of measuring, utilize simultaneously this device to demarcate gas sensor with the standard substance that solid, liquid etc. easily obtain, improved the convenience that device uses.
Description of drawings
Fig. 1: sensor calibration apparatus gas circuit structure schematic diagram of the present invention.
Specific embodiment
Embodiment one
How the present embodiment is demarcated sensor with apparatus of the present invention to introduce in conjunction with Fig. 1.
This device is composed in series by gas concentration adjusting module and gas sensor detection module, it is characterized in that: described gas concentration adjusting module 500 is by air chamber 101, valve 401, valve 402, valve 403, valve 404, air pump 301, gasometry adjuster 201 forms the circulation gas circuit, air pump 301 is connected with air chamber 101 by valve 403,404 with the rear two ends of gasometry adjuster 201 series connection, and described air chamber 101 two other ports connect gas sensor detection module 600 and sample gas by valve 401,402 respectively.Described gas sensor detection module 600 is comprised of air pump 302 and sensor 202 in the present embodiment, according to circumstances also can be without air pump when practical application.
The adjuster of gasometry described in this example 201 is for containing the glass tube of a certain amount of lead acetate glass fiber filter paper, it is the lead acetate solution (being equivalent to 0.1 micromolar lead acetate) of 1mmol/L that this glass fiber filter paper has absorbed 10uL concentration, sensor 202 is the electrochemical gas hydrogen sulfide sensor, the air chamber volume is 30ml, carries out calibration measurements with the hydrogen sulfide gas of 25ppm.Its process is as follows:
1) sensor 202 access devices to be calibrated are connected with air pump 302, open valve 401,402, enter air chamber 101 by pump 302 draw samples gas, the steady-state response electric current of record sensor 202, relation is satisfied in the response of this sensor:
S
1=kC=20.5（uA） （1）
S wherein
1For sensor response, k are that transducer sensitivity, C are gas concentration
2) valve-off 401,402 is opened valve 403,404, makes gas get back to air chamber 101 behind air chamber 101, valve 403, gasometry adjuster 201, air pump 301, valve 404 by air pump.In this cyclic process, in H2S in the sample and the gasometry adjuster 201 lead acetate reaction and consume, the amount of its consumption and lead acetate content satisfy stoichiometric relationship, and hence one can see that behind cyclic balance repeatedly, and the reduction (△ C) of (room temperature 24.5oC) H2S gas concentration is 7.47ppm.
3) open valve 401,402, enter sensor 202 by the gas in the pump 302 extraction gas air chambers 101 and carry out double measurement, the steady-state response electric current of record sensor 202, relation is satisfied in the response of this sensor:
S
2=k(C-△C)=14.4（uA） （2）
Can be tried to achieve by equation (1)-(2):
S1-S2=k△C （3）
k?=(S1-S2)/△C?=?0.813?(uA/ppm) （4）
The transducer sensitivity that said method is tried to achieve is that 0.813uA/ppb(approaches with sensitivity 0.82 uA/ppm that calculates with formula (1)), calculating measure gas concentrations is 25.2ppm, 25ppm is substantially identical with Standard Gases concentration.
This shows, said apparatus and method can be in the situation that when not needing calibrating gas to determine the sensitivity of sensor 202, also can measure sample gas concentration.
The method is on-the-spot demarcates with gaseous sample to be measured, can overcome to greatest extent the impact of humiture, interference gas and sensor signal drift, has improved accuracy and the reliability measured; The method can be demarcated gas sensor with the standard substance that solid, liquid etc. easily obtain simultaneously, has improved the convenience that device uses.
This thinking is further expanded, and any method that can quantitatively control the gas concentration increase or reduce can both be applied to realize the purpose that the quantitative adjusting gas concentration changes in the concentration regulating module, thereby realize the demarcation to sensor.
The method that gas concentration is quantitatively reduced also has but is not limited to: the quantitative chemical reaction, be included in the gas concentration adjusting module quantitatively interpolation and can carry out with component to be measured in the sample gas solid chemicals, solution, test paper, porous adsorbing material etc. of selective reaction, by chemical reaction measure control concentration change amount.
The method that gas concentration is quantitatively increased also has but is not limited to: quantitatively add standard substance, decomposite gas to be measured and the quantitative sorbing material etc. of desorption gas to be measured but gaseous sample to be measured, quantitative heating occur for the standard model gas, the liquid quantitative reaction that comprise quantitative adding concentration known.
The method that gas concentration is quantitatively increased can also be passed through the quantitatively control gas scattering and permeating speed such as anemostat, osmos tube, by calculation sample gas concentration change diffusion time.
Equally, concentration measurements and substances in liquids measurement of concetration are also different without essence in the gas, are applicable to thereby said method and device also are applicable to the measurement of substances in liquids concentration.
Claims (2)
1. gas sensor calibration device, be composed in series by gas concentration adjusting module and gas sensor detection module, it is characterized in that: described gas concentration adjusting module is by air chamber, valve, air pump, the gasometry adjuster forms the circulation gas circuit, air pump is connected with air chamber by valve with the rear two ends of gasometry adjuster series connection, and two other port of described air chamber connects gas sensor detection module and sample gas by valve respectively.
2. a kind of gas sensor calibration device as claimed in claim 1, it is characterized in that wherein said gasometry adjuster is quantitative chemical reactor, comprise solid chemicals, solution, test paper, the porous adsorbing material that can carry out with component to be measured in the sample gas selective reaction in this reactor, by chemical reaction measure control gas concentration variable quantity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220387657 CN202735296U (en) | 2012-08-07 | 2012-08-07 | Gas sensor calibration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220387657 CN202735296U (en) | 2012-08-07 | 2012-08-07 | Gas sensor calibration device |
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| CN202735296U true CN202735296U (en) | 2013-02-13 |
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| CN 201220387657 Expired - Lifetime CN202735296U (en) | 2012-08-07 | 2012-08-07 | Gas sensor calibration device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122773A (en) * | 2019-11-28 | 2020-05-08 | 北京沃斯彤科技有限公司 | Self-calibration type ion sensor and ion detector with same |
-
2012
- 2012-08-07 CN CN 201220387657 patent/CN202735296U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122773A (en) * | 2019-11-28 | 2020-05-08 | 北京沃斯彤科技有限公司 | Self-calibration type ion sensor and ion detector with same |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: WUXI SUNVOU MEDICAL TREATMENT ELECTRONIC CO., LTD. Free format text: FORMER NAME: SHANGWO MEDICAL ELECTRONICS WUXI CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 103 room 214028, Science Park, 7 Changjiang Road, Wuxi New District, Jiangsu, China Patentee after: SUNVOU MEDICAL ELECTRONICS Co.,Ltd. Address before: 103 room 214028, Science Park, 7 Changjiang Road, Wuxi New District, Jiangsu, China Patentee before: Sunvou Medical Electronic Wuxi Co.,Ltd. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Device and method for calibrating gas sensor Effective date of registration: 20131021 Granted publication date: 20130213 Pledgee: Agricultural Bank of China Limited by Share Ltd. Wuxi science and Technology Branch Pledgor: SUNVOU MEDICAL ELECTRONICS Co.,Ltd. Registration number: 2013990000761 |
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| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20171225 Granted publication date: 20130213 Pledgee: Agricultural Bank of China Limited by Share Ltd. Wuxi science and Technology Branch Pledgor: SUNVOU MEDICAL ELECTRONICS Co.,Ltd. Registration number: 2013990000761 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130213 |
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| CX01 | Expiry of patent term |