CN108613915A - A kind of OTR oxygen transmission rate test device, system and method - Google Patents
A kind of OTR oxygen transmission rate test device, system and method Download PDFInfo
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- CN108613915A CN108613915A CN201810779272.4A CN201810779272A CN108613915A CN 108613915 A CN108613915 A CN 108613915A CN 201810779272 A CN201810779272 A CN 201810779272A CN 108613915 A CN108613915 A CN 108613915A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
Abstract
The invention discloses a kind of OTR oxygen transmission rate test device, system and methods, including at least one test chamber, sensor module and switching device, the sensor module includes the different lambda sensor of at least two in parallel ranges or/and precision, oxygen is by that can accommodate the test chamber of sample, by the break-make of selection control the connection test chamber and the connecting line of each lambda sensor of switching device.The present invention selects the sensor detection of the range and precision that are more adapted to according to the oxygen concentration and accuracy of detection needs of under test gas.The gas circuit component passes through pipeline comprising pipeline, valve, each element and component and valve connects.One equipment uses the sensor group of multiple lambda sensors, can meet the detection demand of a variety of ranges and a variety of precision.
Description
Technical field
The present invention relates to a kind of OTR oxygen transmission rate test device, system and methods.
Background technology
Material is the important indicator weighed material and whether be suitable for certain fields to the barrier property of oxygen：To packing timber
For material, the shelf-life of article in packaging is directly affected；For engineering material such as resistance oxygen pipe, it is meant that tap water is in pipeline
It is whether oxidizable rotten when transport；The material for having anti-flammability for requirements such as building materials, ship, vehicle, household electrical appliances, the barrier to oxygen
Property mean whether reach fire-retardant index, whether there is security risk.For certain special electronic components, by oxidation corrosion
Afterwards, the electric attributes such as the resistance of component are influenced.The basic skills of test material oxygen permeability (i.e. barrier property of the material to oxygen)
It is the content for testing oxygen in the gas for penetrating material.There are many kinds of test methods, and domestic and international relevant criterion all determines
Packaging material oxygen resistance is detected with electrochemical process lambda sensor.
The core component entirely tested is lambda sensor, and the performance and precision of sensor directly determine the property of whole instrument
Energy and precision.The advantages of oxygen sensor is accuracy of detection height, can reach ppm (i.e. millionth ratio/concentration)
Grade, the disadvantage is that the depletion sensor is fast, chemistry occurs for the active matter of each oxygen molecule being detected by a sensor and sensor
It reacts, the active material in consuming sensor.If the oxygen molecule into sensor is excessive, active material will run out of quickly.
One ppm grades of oxygen sensor, which normally works, to be used 2 years or so, but if exposure is in air, within one day
It will scrap completely.
When detecting high barrier material oxygen permeability, the oxygen molecule amount for penetrating sample is fewer, to ensure accuracy of detection, wishes
It hopes all oxygen molecules enter sensor response entirely as far as possible, relatively large current signal, output current letter can be generated in this way
Number processing work difficulty will reduce, the measurement result close to absolute true value can be obtained.It is this and enter its in it is nearly all
The electrochemical sensor that oxygen molecule all reacts, range is small, and precision is high.It is more through the oxygen molecule amount come for low-resistance barrier material,
If whole oxygen molecules and sensor response, can substantially reduce the service life of sensor, thus only a certain proportion of oxygen molecule into
Enter the active material reaction of sensor and sensor.Partial oxidation generates electric signal with sensor response, it is not known that really more
The oxygen and sensor response of few ratio, later stage current signal data processing is difficult, causes detection error larger.This sensor
Range is big, and precision is low.
The technological difficulties of packaging material oxygen resistance detecting instrument are at present：
A current OTR oxygen transmission rate test equipment only installs a lambda sensor, can not take into account wide range and high-precision
Testing requirements；
Meanwhile when disassembling sensor, sensor will inevitably expose in air, and a large amount of oxygen enter system pipes
Road, substantially reduces the service life of sensor, and an instrument can not be realized by frequently dismounting the lambda sensor of different range accuracies
The detection of a variety of ranges, a variety of precision.
And a corresponding test equipment only installs a lambda sensor, sensor can consume quickly to be scrapped, and is frequently scrapped
More emat sensor undoubtedly increases the working service cost of client again.
Invention content
The present invention is to solve the above-mentioned problems, it is proposed that a kind of OTR oxygen transmission rate test device, system and method, the present invention
It changes a previous equipment and uses a sensor, wide range and high-precision problem can not be taken into account；Also it solves tradition to set
The problem of single sensor of standby use, depletion sensor is fast, short life.
To achieve the goals above, the present invention adopts the following technical scheme that：
The present invention provides a kind of OTR oxygen transmission rate test device, including at least one test chamber, sensor module and switch
Device, the sensor module include the different lambda sensor of at least two in parallel ranges or/and precision, and oxygen is by can
The test chamber for accommodating sample is connected to the logical of the connecting line of test chamber and each lambda sensor by the selection control of switching device
It is disconnected.The lambda sensor being adapted to gas concentration to be tested using range or/and precision is detected.
Further, lambda sensor in parallel in the sensor module at least there are three, and each two lambda sensor it
Between at least range or precision it is different.
Further, the sensor module includes at least two lambda sensor branches in parallel, at least one oxygen passes
Sensor branch includes multiple concatenated lambda sensors, and along airflow direction, the concatenated lambda sensor precision increases successively.
Further, the sensor module includes at least two lambda sensor branches in parallel, at least one oxygen sensing
Device branch includes multiple concatenated oxygen sensor elements, and each oxygen sensor element is a lambda sensor or the oxygen of multiple parallel connections
Sensor, along airflow direction, the concatenated lambda sensor precision increases successively.
Further, the test chamber is multiple, and in parallel between the test chamber, and each test chamber is by respective
Connecting line is connected at sensor module.
Further, the switching device is selecting switch, triple valve or switch matrix.
Certainly, those skilled in the art can be on the basis of the present invention to changing in the selection of above-mentioned switching device
Into as being provided with solenoid valve on the connecting line of each lambda sensor or lambda sensor group branch, by giving corresponding solenoid valve
The simple replacement of those skilled in the art is belonged to the conducting etc. for controlling connecting line to electricity, ought to belong to the present invention's
Protection domain.
Further, the test device further includes at least one gas exhaust piping being connected to test chamber, by test chamber
Lower intracavity gas direct emission.
Further, the test device further includes oxygen feeding tube road, and each oxygen feeding tube road is connected to the epicoele of test chamber, is sent
Enter oxygen.
Further, the test device further includes that (carrier gas can be the inert gases such as nitrogen, helium, the present invention for carrier gas
By taking nitrogen as an example) pipeline, each gas-carrier pipeline is connected to the cavity of resorption of test chamber, is sent into carrier gas.
Further, the sensor module is directly connected to by gas circuit with gas-carrier pipeline.
Further, the gentle road of the connecting line is provided with control valve.
The present invention provides a kind of OTR oxygen transmission rate test system, including above-mentioned test device and data processor, the number
It is connect with each oxygen sensor according to processor, receives its detection data, according to the data of each lambda sensor, obtain test knot
Fruit.
The present invention provides a kind of OTR oxygen transmission rate test method, includes the following steps：
1), test gas is passed through epicoele：Oxygen enters the epicoele of each test chamber, until test intracavity gas is stablized；
2), carrier gas purge cavity of resorption：Nitrogen carrier gas flows through the cavity of resorption of each test chamber；
3) zero value, is obtained：Start to test, cavity of resorption gas is introduced into air, selects range compatible with oxygen transit dose
Lambda sensor, the oxygen concentration that lambda sensor is read at this time is zero pipeline oxygen concentration value z, and the z values after stabilization are denoted as zero oxygen
Concentration；
4) oxygen concentration of sample infiltration, is measured：Zero gas pass is entered air, the gas of cavity of resorption, which is introduced corresponding oxygen, to be passed
Sensor, the oxygen concentration value a that sample of the oxygen concentration that lambda sensor is read at this time between upper and lower cavity is permeated, when record is stablized
A values be denoted as the oxygen concentration of sample, the difference of oxygen concentration value a and zero oxygen concentration z is exactly the oxygen concentration that sample is permeated.
Further, in the case where not knowing the oxygen transit dose of sample, the first lambda sensor for selecting range larger, test
Zero oxygen concentration, then test infiltration oxygen concentration, if the oxygen concentration value a for the test chamber measured is more than smaller the of range
The maximum range of two lambda sensors continues with the first lambda sensor and measures；
If it find that gas in the measurement range of the second lambda sensor, is then introduced second by the oxygen concentration value a of test chamber
Lambda sensor repeats above-mentioned test process, and oxygen concentration value a and zero oxygen concentration z should all be by the second smaller lambda sensor of range
It measures.
Compared with prior art, beneficial effects of the present invention are：
1, the present invention can realize the measurement of hypersorption formula, according to the oxygen concentration of under test gas and accuracy of detection needs,
The range of adaptation and the sensor detection of precision are selected, the accuracy of OTR oxygen transmission rate test can be effectively improved；
2, the sensor group that an equipment uses multiple lambda sensors may be implemented in the present invention, can meet a variety of ranges and more
The detection demand of kind of precision solves a previous equipment and uses a sensor, can not take into account wide range and high-precision ask
Topic；Also it solves traditional equipment and uses single sensor, the problem of depletion sensor is fast, short life；
3, the present invention provides lambda sensor connection in series-parallel, different ranges are formed or/and detection branch that precision is mutually arranged in pairs or groups, energy
The measuring accuracy or range that sensor is enough changed by modular flexible design, realize and customize, and meet a variety of ranges and more
The detection demand of kind precision.
Description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not constitute the improper restriction to the application for explaining the application.
Fig. 1 is 1 schematic diagram of embodiment；
Fig. 2 is 2 schematic diagram of embodiment；
Fig. 3 is 3 schematic diagram of sensor group embodiment；
Fig. 4 is 4 schematic diagram of sensor group embodiment；
Fig. 5 is 5 schematic diagram of sensor group embodiment；
Fig. 6 is 6 schematic diagram of sensor group embodiment；
Wherein：1, the first lambda sensor, 2, valve IV, the 3, second lambda sensor, 4, pipeline I, 5, triple valve I, 6, valve I, 7,
Pipeline II, 8, cavity of resorption I, 9, pipeline III, 10, pipeline IV, 11, pipeline V, 12, pipeline VI, 13, valve II, 14, pipeline VII, 15,
Pipeline VIII, 16, valve III, 17, triple valve II, 18, triple valve III, 19, pipeline IX, 20, pipeline X, 21, pipeline XI, 22, pipe
Road XII, 23, pipeline XIII, 24, triple valve IV, 25, pipeline XIV, 26. data processing systems, 27. epicoele I, 28. epicoeles
II, 29. cavity of resorption II, 30. pipeline XV, 31. valve VI, 32. pipeline XVI.
1-1. triple valves, 4-1. data processing systems, 5-1. sensors III, 6-1. sensor IV, 7-1. sensor V, 8-
1. sensor VI, 9-1. sensor VII, 10-1. sensor VIII, 11-1. sensor IX, 12-1. sensors X, 13-1. is passed
Sensor XI, 14-1. sensors X II, 15-1. sensors X III, 16-1. sensors X IV, 17-1. sensors X V, 18-1. sensing
Device XVI, 19-1. sensors X VII, 20-1. sensors X VIII.
In figure, air shows air or air, O2Indicate oxygen, N2Indicate nitrogen.
Specific implementation mode：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
In the present invention, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", " side ",
The orientation or positional relationship of the instructions such as "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate describing this hair
Bright each component or component structure relationship and the relative of determination, not refer in particular to either component or element in the present invention, cannot understand
For limitation of the present invention.
In the present invention, term such as " affixed ", " connected ", " connection " shall be understood in a broad sense, and indicate may be a fixed connection,
Can also be to be integrally connected or be detachably connected；It can be directly connected, it can also be indirectly connected through an intermediary.For
The related scientific research of this field or technical staff can determine the concrete meaning of above-mentioned term in the present invention as the case may be,
It is not considered as limiting the invention.
As being pointed out in background technology, there are an OTR oxygen transmission rates for existing packaging material oxygen resistance detecting instrument
Test equipment only installs a lambda sensor, can not take into account wide range and high-precision testing requirements, and when disassembling sensor, passes
Sensor will inevitably expose in air, and a large amount of oxygen enter system pipeline, substantially reduce the service life of sensor, Wu Fatong
It crosses and frequently dismounts the lambda sensor of different range accuracies to realize that the detection of a variety of ranges, a variety of precision, sensor can disappear quickly
Consumption is scrapped, and the problems of maintenance cost are increased.
The present invention is by providing a kind of OTR oxygen transmission rate test device with oxygen sensor group, including sensor group, survey
Try chamber and gas circuit component.Sample is placed in test chamber, and the gas for penetrating sample enters sensor group through gas circuit component.Sensing group
Including at least the first lambda sensor in parallel, the second lambda sensor, the range of the first lambda sensor and the second lambda sensor or/and
Precision is different, according to the oxygen concentration of under test gas and accuracy of detection needs, selects the biography of the range or/and precision that are more adapted to
Sensor detects.
The gas circuit component being previously mentioned includes pipeline and valve, and sensor group, test chamber pass through piping connection.It is provided on pipeline
Valve.And valve may include switch valve and triple valve, switch valve controls the shutdown and conducting on respective tube road, and triple valve carries out pipeline
Selection.
Of course, it is possible to control selection and the break-make of corresponding pipeline in other ways, such as each pipeline is respectively communicated to sense
Device group, and it is both provided with solenoid valve etc. on each pipeline.
Such design can realize an equipment use multiple lambda sensors sensor group, can meet a variety of ranges and
The detection demand of a variety of precision.It changes a previous equipment and uses a sensor, wide range and high-precision can not be taken into account
Problem；Also it solves traditional equipment and uses single sensor, the problem of depletion sensor is fast, short life.
Certainly, as highly preferred embodiment, sensor group includes concatenated several sensors, can be connected more
A, theoretically, concatenated sensor is more, and oxygen is absorbed that more abundant, extra oxygen is fewer by sensor, sensor group
Accuracy of detection is higher.
When series connection, under test gas followed by each sensor, the design principle of each sensor is the biography first flowed through
The range for the sensor that the range of sensor flows through after being more than, but after the precision of sensor that flows through be higher than the sensor first flowed through
Precision.
Such design can ensure that the sensor of wide range can first absorb most oxygen, and as oxygen is dense
Degree it is smaller and smaller, behind the sensor of higher precision can be there are one more accurately measuring.
As an implementation, sensor group is simultaneously sensors in series group, and sensors in series group has several groups in parallel
Sensor, one group of parallel sensor can be single sensor or sensors in series group.
As an implementation, sensor group is connection in series-parallel sensor group, and connection in series-parallel sensor group has several groups series connection
Sensor, one group of sensors in series can be single sensor or parallel sensor group.
Then, and a kind of OTR oxygen transmission rate test system, the data transmission that sensor group is detected to data are provided
Processing system processing.The OTR oxygen transmission rate of sample can be calculated automatically.
Lambda sensor group is with the not consistent lambda sensor of multiple ranges or precision, when a measurement is taken, first with
The larger lambda sensor of range measures, to ensure that its detection range can bear the oxygen concentration under test gas, if
Confirm that the oxygen concentration under test gas differs in the measuring range of certain lambda sensor, and with the maximum range of the lambda sensor
It is smaller, it switches to the lambda sensor and measures.
In considering for precision, can be carried out first with the lambda sensor of the oxygen detection required precision close under test gas
It measures, still, it is ensured that the measuring range of the lambda sensor is more than the oxygen concentration of under test gas.
As exemplary embodiments, detailed narration is carried out using following several performances.
Embodiment 1
As shown in Fig. 2, a kind of OTR oxygen transmission rate test device with oxygen sensor group, including sensor group, test chamber,
Gas circuit component.Sample is placed in test chamber, and the gas for penetrating sample enters sensor group through gas circuit component.
Sensing group includes the first lambda sensor 1 of parallel connection, the second lambda sensor 3, and the first lambda sensor 1 and the second oxygen sense
The range of device 3 is different, and precision is different, according to the oxygen concentration of under test gas and accuracy of detection needs, selects the amount being more adapted to
The sensor of journey and precision detects.Realize a variety of detection ranges of an OTR oxygen transmission rate test equipment and precision.Gas circuit component packet
Containing pipeline, valve.Pipeline III9, the one end pipeline V11 are connected to epicoele I27, the external air of the pipeline V11 other ends；Pipeline II7, pipe
Road IV10 is connected to cavity of resorption I8, carries the pipeline II7 connection cavity of resorption I8 and pipeline VIII15 of valve I6, is set successively on pipeline VIII15
There are valve III16, triple valve III18；III18 points of 2 tunnels of triple valve：Sensor group is passed through by pipeline X20 all the way, another way passes through
Pipeline IX19 is passed through ambient atmosphere；Pipeline IV10 is connected to triple valve I5, I5 points of 2 tunnels of triple valve：It is connected all the way by pipeline I4
To pipeline X20, another way is connected to external air by pipeline XIII23.
Pipeline X20 is connected to sensor group in parallel by triple valve IV24, after airflow direction, the first lambda sensor 1
Face is connected with valve VI31, and valve IV2 is connected with behind the second lambda sensor 3.
Sensor group is also connected with data processing system 26, forms test system.
The course of work of test system is as follows：
1, oxygen enters epicoele I27 by pipeline III9, and then V11 is discharged into air by the road, this process is to test chamber
Epicoele is passed through test gas.
2, nitrogen flows through cavity of resorption I8 by valve I6, then IV10 reaches triple valve I5 by the road, meanwhile, nitrogen passes through valve
III16 reaches triple valve III18.
3, when experiment just starts, triple valve I5 is connected to pipeline XII23, and cavity of resorption gas is introduced air.Triple valve III18
It is connected with pipeline IX20, gas flow to triple valve IV24, in the case where not knowing the about oxygen transit dose of sample, triple valve IV24
First lambda sensor 1 of default choice wide range, the oxygen concentration that the first lambda sensor of wide range 1 is read at this time are zero pipeline oxygen
Concentration value z, after nitrogen purges a period of time, z values tend towards stability, and no longer change, and z values at this time are denoted as zero oxygen concentration.
4, triple valve III18 switches, and pipeline VIII15 and pipeline VIII19 are logical, and zero gas pass is entered air, triple valve
I5 switches, and pipeline IV10 and pipeline I4 are logical, the gas of cavity of resorption I8 is introduced triple valve IV24, triple valve IV24 acquiescence connections are a large amount of
The first lambda sensor of journey 1, the oxygen concentration value that the first lambda sensor of wide range 1 is read at this time is a, when this process persistently carries out one section
Between after, a values tend towards stability, and no longer change, and a values at this time are denoted as the oxygen concentration measured, oxygen concentration value a and zero oxygen concentration z
Difference a-z be exactly oxygen concentration that sample I is permeated.
If the oxygen concentration value a for the test chamber measured at this time is more than the second lambda sensor of small-range 3, triple valve
IV25 haves no need to change state, proper testing.
If it find that the oxygen concentration value a of test chamber is in the measurement range of the second lambda sensor of small-range 3, then triple valve
IV25 switches, and pipeline IX20 and pipeline XV32 are logical, and gas is introduced the second lambda sensor of small-range 3, repeats above-mentioned tested
Journey, z, a value should all be measured by the second lambda sensor of small-range 3.Computational methods and when being measured using the first lambda sensor one
It causes.
Embodiment 2
As shown in Figure 1, a kind of OTR oxygen transmission rate with oxygen sensor group tests system, multiple test chambers can be carried out
Test, including sensor group, multiple test chambers (being two shown in Fig. 1) and gas circuit component.The sample I is placed in epicoele
In I27 and cavity of resorption I8, sample II is placed in epicoele II28 and cavity of resorption II29, and the gas for penetrating sample enters biography through gas circuit component
Sensor group, the data transmission that sensor group detects to data processing system processing.The sensing group includes the first of parallel connection
The range of lambda sensor, the second lambda sensor, the first lambda sensor and the second lambda sensor is different, and precision is different, according to be measured
The oxygen concentration and accuracy of detection of gas need, and select the sensor detection of the range and precision that are more adapted to.
Gas circuit component includes multiple pipelines and valve.Pipeline III9, pipeline V11 are connected to epicoele I27, pipeline II7, pipeline
IV10 is connected to cavity of resorption I8, carries the pipeline II7 connection cavity of resorption I8 and pipeline VIII15 of valve I6, is equipped with successively on pipeline VIII15
Valve III16, triple valve III18；III18 points of 2 tunnels of triple valve：Sensor group is passed through by pipeline IX20 all the way, another way passes through
Pipeline VIII19 is passed through ambient atmosphere；Pipeline IV10 is connected to triple valve I5, I5 points of 2 tunnels of triple valve：Connected all the way by pipeline I4
It is connected to pipeline IX20, another way is connected to external air by pipeline XII23；
Pipeline IX20 is connected to sensor group in parallel by triple valve IV24, after airflow direction, the first lambda sensor
Face meets valve VI31, and valve IV2 is met behind the second lambda sensor；The sensor group is also connected with data processing system, handles sensor
Data；
Pipeline V11, pipeline XIV30 are connected to epicoele II28, and the pipeline XIV30 other ends connect air；Pipeline VII14, band
There is the pipeline VI12 of valve II13 to be connected on cavity of resorption II29, the pipeline VI12 other ends are connected to pipeline VIII15, and pipeline VII14 is another
One end carries triple valve II17, and II17 points of triple valve is 2 tunnels：XI22 is connected to pipeline IX20 by the road all the way, and another way passes through pipe
X21 is connected to air.
The course of work is as follows：
1, oxygen enters epicoele I27 by pipeline III9, then enters epicoele II28 by pipeline V11, and then XIV30 is arranged by the road
Enter air, this process is passed through test gas to the epicoele of test chamber.
2, nitrogen flows separately through cavity of resorption I8 and cavity of resorption II29, then arrive separately at triple valve I5, three by valve I6, valve II13
Port valve II17, while reaching triple valve III18 by valve III16.
3, when experiment just starts, triple valve I5, triple valve II17 are connected to pipeline XIII23, pipeline XI21 respectively, under
Chamber gas introduces air.Triple valve III18 is connected with pipeline X20, and gas flow to triple valve IV24, in the about oxygen for not knowing sample
In the case of transit dose, triple valve IV24 default choices lead to the first lambda sensor 1 of wide range, and the first oxygen of wide range senses at this time
The oxygen concentration that device 1 is read is zero pipeline oxygen concentration value z, and after nitrogen purges a period of time, z values tend towards stability, and no longer change,
Z values at this time are denoted as zero oxygen concentration.
4, triple valve III18 switchings and pipeline IX19 are logical, and zero gas pass is entered air, triple valve I5 switchings and pipeline I4
It is logical, the gas of cavity of resorption I8 is introduced triple valve IV24 and the first lambda sensor of wide range 1, at this time the first lambda sensor of wide range 1
The cavity of resorption I8 oxygen concentration values of reading are a, and after this process persistently carries out a period of time, a values tend towards stability, and no longer change, at this time
A values be denoted as the oxygen concentration measured, the difference a-z of oxygen concentration value a and zero oxygen concentration z is exactly that the oxygen that is permeated of sample I is dense
Degree.
If the oxygen concentration value a for the test chamber measured at this time be more than the second lambda sensor of small-range 3 range, three
Port valve IV24 haves no need to change state, proper testing.
If it find that the oxygen concentration value a of test chamber is in the measurement range of the second lambda sensor of small-range 3, then triple valve
IV24 is switched over, and pipeline X20 is connected to pipeline XIV25, and gas is introduced the second lambda sensor of small-range 3, repeats above-mentioned survey
Examination process, z, a value should all be measured by the second lambda sensor of small-range 3.Computational methods are measured with using the first lambda sensor
When it is consistent.
5, triple valve I5 is switched over and pipeline XIII23 is connected, and the gas of cavity of resorption I8 is introduced air, triple valve II17
It switches to and is connected to pipeline XII22, the cavity of resorption gas of cavity of resorption II29 is introduced triple valve IV24 and the first lambda sensor of wide range
1, the oxygen concentration value that the first lambda sensor of wide range 1 reads cavity of resorption II29 at this time is b, after this process persistently carries out a period of time, b
Value tends towards stability, and no longer changes, and b values at this time is denoted as the oxygen concentration measured, b-z is exactly the oxygen concentration that sample II is permeated.
If the oxygen concentration value b for the test chamber measured at this time be more than the second lambda sensor of small-range 3 range, three
Port valve IV24 haves no need to change state, proper testing.
If it find that the oxygen concentration value b of test chamber is in the measurement range of the second lambda sensor of small-range 3, then triple valve
IV24 switches, and pipeline X20 is connected to pipeline XIV25, and gas is introduced the second lambda sensor of small-range 3, repeats above-mentioned tested
Journey, z, b value should all be measured by the second lambda sensor of small-range 3.Computational methods and when being measured using the first lambda sensor one
It causes.
The time that step 4,5 test gas are passed through the test of lambda sensor group is different, thus step 4,5 may be by different
Sensor test.Certainly, the present embodiment is merely illustrative, can increase more test chambers, ensures independence between test chamber, successively
Parallel connection, other test chambers and the connection type of connecting line and data processing system are referred to the side that this attached drawing provides
Formula.
Embodiment 3
As shown in figure 3, on the basis of embodiment 1 and embodiment 2, different is that sensor group includes the more of parallel connection
A sensor, shown in figure is three, still, can also be extended in other embodiments, more sensors in parallel.
Embodiment 4
Be sensor group include concatenated if different as shown in figure 4, on the basis of embodiment 1 and embodiment 2
Dry sensor (can connect multiple, as shown in figure 3, theoretically, concatenated sensor is more, oxygen is got over by what sensor absorbed
Fully, extra oxygen is fewer, and the accuracy of detection of sensor group is higher).Remaining is the same as embodiment 1 or embodiment 2.
Embodiment 5
As shown in figure 5, on the basis of embodiment 1 and embodiment 2, different is that sensor group is and sensing of connecting
Device group, it can be single sensor or string that described and sensors in series group, which has several groups parallel sensor, one group of parallel sensor,
Join sensor group.
Several concatenated oxygen sensors, under test gas by pipeline followed by each sensor, if concatenated
Successively from large to small, the precision of sensor is gradually got higher the range of dry sensor.Under test gas is remaining after a sensor
Oxygen again by subsequent sensor absorption detecting to such a series of sensor is more, and oxygen is by sensor under test gas
What is absorbed is more abundant, and more thorough, extra oxygen is fewer, and the accuracy of detection of sensor group is higher.
Each transducer range in parallel is different, and precision is different, according to detection needs, selects the required accuracy and the sensing of range
Device detects.Such OTR oxygen transmission rate test equipment, can there are many detection ranges and precision.
Embodiment 6
As shown in fig. 6, on the basis of embodiment 1 and embodiment 2, the difference is that sensor group senses for connection in series-parallel
Device group, it can be single sensor that the connection in series-parallel sensor group, which has several groups sensors in series, one group of sensors in series,
Or parallel sensor group.
Each transducer range in parallel is different, and precision is different, according to detection needs, selects the required accuracy and the sensing of range
Device detects.Such OTR oxygen transmission rate test equipment, can there are many detection ranges and precision.
Several concatenated oxygen sensors, under test gas by pipeline followed by each sensor, if concatenated
Successively from large to small, the precision of sensor is gradually got higher the range of dry sensor.Under test gas is remaining after a sensor
Oxygen again by subsequent sensor absorption detecting to such a series of sensor is more, and oxygen is by sensor under test gas
What is absorbed is more abundant, and more thorough, extra oxygen is fewer, and the accuracy of detection of sensor group is higher.
Certainly, above-mentioned specific implementation mode, only example for example, in the above embodiment is carried out using triple valve
The switching of pipeline, but can also utilize selecting switch, multiple pipelines in fact, is provided with solenoid valve on each pipeline, by giving pair
The solenoid valve answered is to electricity, with the conducting etc. for controlling connecting line.
It, should be with the size, the pipeline that need to carry out measurement system in the corresponding switching of selection or selector or circuit
Arrangement mode etc. be adapted, with the optimization of multiple influence factors such as cost of implementation and circuit design.
The foregoing is merely the preferred embodiments of the application, are not intended to limit this application, for the skill of this field
For art personnel, the application can have various modifications and variations.Within the spirit and principles of this application, any made by repair
Change, equivalent replacement, improvement etc., should be included within the protection domain of the application.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (11)
1. a kind of OTR oxygen transmission rate test device, it is characterized in that：Including at least one test chamber, sensor module and derailing switch
Part, the sensor module include the different lambda sensor of at least two in parallel ranges or/and precision, and oxygen is by that can hold
It receives the test chamber of sample, the break-make of connection test chamber and the connecting line of each lambda sensor is controlled by switching device.
2. a kind of OTR oxygen transmission rate test device as described in claim 1, it is characterized in that：It is in parallel in the sensor module
Lambda sensor at least there are three, and at least range or precision are different between each two lambda sensor.
3. a kind of OTR oxygen transmission rate test device as described in claim 1, it is characterized in that：The sensor module includes at least
Two lambda sensor branches in parallel, at least one lambda sensor branch includes multiple concatenated lambda sensors, along air-flow side
To the concatenated lambda sensor precision increases successively.
4. a kind of OTR oxygen transmission rate test device as described in claim 1, it is characterized in that：The sensor module includes at least
Two lambda sensor branches in parallel, at least one lambda sensor branch include multiple concatenated oxygen sensor elements, each oxygen
Sensor unit is a lambda sensor or the lambda sensor of multiple parallel connections, along airflow direction, the concatenated lambda sensor essence
Degree increases successively.
5. a kind of OTR oxygen transmission rate test device as described in claim 1, it is characterized in that：The test chamber is multiple, and institute
State in parallel between test chamber, each test chamber is connected to by respective connecting line at sensor module.
6. a kind of OTR oxygen transmission rate test device as described in claim 1, it is characterized in that：It further include at least one and test chamber
The gas exhaust piping of connection, by the lower intracavity gas direct emission of test chamber.
7. a kind of OTR oxygen transmission rate test device as described in claim 1, it is characterized in that：Further include oxygen feeding tube road, Mei Gejin
Oxygen pipeline is connected to the epicoele of test chamber, is sent into oxygen；
Or/and further include gas-carrier pipeline, each gas-carrier pipeline is connected to the cavity of resorption of test chamber, is sent into carrier gas；
Further, the sensor module is directly connected to by gas circuit with into gas-carrier pipeline.
8. a kind of OTR oxygen transmission rate test device as described in claim 1, it is characterized in that：Control is provided on the connecting line
Valve processed.
9. a kind of OTR oxygen transmission rate tests system, it is characterized in that：It include the test device as described in any one of claim 1-8
And data processor, the data processor are connect with each oxygen sensor, receive its detection data, are sensed according to each oxygen
The data of device, obtain test result.
10. a kind of OTR oxygen transmission rate test method, it is characterized in that：Include the following steps：
1), test gas is passed through epicoele：Oxygen enters the epicoele of each test chamber；
2), carrier gas purge cavity of resorption：Carrier gas flows through the cavity of resorption of each test chamber；
3) zero value, is obtained：Start to test, cavity of resorption gas is introduced into air, range oxygen compatible with oxygen transit dose is selected to pass
Sensor, the oxygen concentration that lambda sensor is read at this time is zero pipeline oxygen concentration value z, and the z values after stabilization are denoted as zero oxygen concentration；
4) oxygen concentration of sample infiltration, is measured：Zero gas pass is entered air, the gas of cavity of resorption, which is introduced corresponding oxygen, to be sensed
Device, the oxygen concentration value a that sample of the oxygen concentration that lambda sensor is read at this time between upper and lower cavity is permeated, when record is stablized
A values are denoted as the oxygen concentration of sample, and the difference of oxygen concentration value a and zero oxygen concentration z is exactly the oxygen concentration that sample is permeated.
11. a kind of OTR oxygen transmission rate test method as claimed in claim 10, it is characterized in that：In the oxygen transit dose for not knowing sample
In the case of, the first lambda sensor for selecting range larger tests zero oxygen concentration, then test infiltration oxygen concentration, if surveyed
The oxygen concentration value a of the test chamber measured is more than the maximum range of the second smaller lambda sensor of range, continues with the first oxygen biography
Sensor measures；
If it find that gas in the measurement range of the second lambda sensor, is then introduced the second oxygen and passed by the oxygen concentration value a of test chamber
Sensor, repeats above-mentioned test process, and oxygen concentration value a and zero oxygen concentration z should all be measured by the second smaller lambda sensor of range.
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| CN201810779272.4A CN108613915A (en) | 2018-07-16 | 2018-07-16 | A kind of OTR oxygen transmission rate test device, system and method |
| PCT/CN2018/099575 WO2020015030A1 (en) | 2018-07-16 | 2018-08-09 | Oxygen permeability testing device, system, and method |
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| CN201810779272.4A CN108613915A (en) | 2018-07-16 | 2018-07-16 | A kind of OTR oxygen transmission rate test device, system and method |
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