CN104374879A - Oxygen sensor calibration method and on-line calibration device - Google Patents
Oxygen sensor calibration method and on-line calibration device Download PDFInfo
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- CN104374879A CN104374879A CN201410663262.6A CN201410663262A CN104374879A CN 104374879 A CN104374879 A CN 104374879A CN 201410663262 A CN201410663262 A CN 201410663262A CN 104374879 A CN104374879 A CN 104374879A
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Abstract
The invention provides an oxygen sensor calibration method. The method comprises the following step: by using a change value of the content of oxygen in a closed space as a theoretical value and using the reading value of an oxygen sensor connected with the closed space as a measurement value, comparing the measurement value with a theoretical value to finish the calibration of the oxygen sensor. The invention further provides an on-line oxygen sensor calibration device. Through the adoption of the new calibration method provided by the invention, the calibration can be performed by using the self reading value of the sensor without removing the sensor and using other verification instruments and standard gas, the calibration is free of condition restriction, the instrument maintenance cost is reduced, the calibration can be performed any time any where, the calibration condition is simplified, and the implementation is convenient.
Description
Technical field
The present invention relates to oxygen and divide analysis field, particularly relate to a kind of lambda sensor online calibration method and caliberating device.
Background technology
In gas, oxygen content detecting sensor is widely used in the industries such as lithium electricity, nuclear energy, medical science, these fields usually relate to some processing steps extremely responsive to oxygen, need in a confined space, to build oxygen-free environment or oxygen content is limited in a less scope, therefore oxygen content scope is had high requirements, also very high request is correspondingly proposed to the precision of lambda sensor.
The lambda sensor be fixed on instrument usually needs to demarcate, and to guarantee its accuracy, ensures normally to use.But the demarcation now to lambda sensor, usually need sensor to take out from instrument and to compare detection with gas again, and then the installation of oxygen sensing instrument is gone back, or at timing signal, lambda sensor two is connected gas, so not only time-consuming trouble, and likely affect the precision of sensor when dismantling and install, or cause damage.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art existence, a kind of lambda sensor scaling method and on-line proving device are provided, realize the on-line proving of lambda sensor, simple and convenient, rapid and convenient.
For achieving the above object, technical scheme of the present invention is: a kind of lambda sensor scaling method, with the changing value of oxygen content in confined space for theoretical value, with the reading of the lambda sensor be connected with confined space for measured value, measured value and theoretical value are contrasted thus completes the demarcation of lambda sensor.
Wherein, the reference of known volume is injected known volume confined space, and the oxygen content change formulae discovery in confined space draws, is namely theoretical value; Reading on lambda sensor is measured value; By theoretical value compared with measured value, the demarcation to lambda sensor can be completed.
Wherein, described formula is Δ Ct=Cs × Vs/Vg;
Δ Ct is the theoretical value of oxygen content change;
Cs is oxygen content in reference;
Vs is the reference amount injected;
Vg is the volume of confined space.
Described reference is air, or the gas that any oxygen content is known.
The present invention also provides a kind of lambda sensor on-line proving device, for injecting quantitative reference to single or multiple in confined space, described lambda sensor on-line proving device is provided with injection port and outlet, described outlet and described confined space are tightly connected, and described lambda sensor on-line proving device also comprises:
Reference locker room, is connected with described injection port, for extracting and store quantitative reference;
Reference transporter, for being transported to the quantitative reference in described reference locker room in described confined space.
One embodiment of the present invention are, described reference transporter comprises:
Perfusor piston, comprise piston rod and be arranged at two piston plates on piston rod, described two piston plates mate with reference locker room inner wall sealing, and described two piston plates and reference locker room inwall form the pick up and store space of quantitative reference;
Reference transhipment room, one end open is arranged in confined space as outlet, the other end is connected with described reference locker room or one-body molded, and its inner wall size seals with described two piston plates mates, and the length of described reference transhipment room is more than or equal to the distance between two piston plates.
Described reference locker room is also connected with reference imported valve and reference outlet valve.
Also can optionally configuration driven device, move to transport the reference in described storage space for promoting perfusor piston.
Another embodiment of the invention is, described reference transporter comprises: perfusor piston, comprise piston rod and be arranged at the piston plate on piston rod, described piston plate mates with reference locker room inner wall sealing, and described piston plate and reference locker room inwall form the pick up and store space of quantitative reference;
The other end of described reference locker room is connected with described outlet, described injection port and outlet are provided with one-way cock, when piston plate is positioned at bottom reference locker room or when being moved bottom reference locker room by outlet end, injection port one-way cock is opened, and outlet one-way cock is closed simultaneously; When piston plate is by when moving to outlet bottom reference locker room, injection port one-way cock is closed, and outlet one-way cock is opened simultaneously.
Also can optionally configuration driven device, move to transport the reference in described storage space for promoting perfusor piston.
Another embodiment of the invention is, described reference apotheca comprises reference batcher 42, reference entrance 45, prime three-way valve 41, reference outlet 46, rear class three-way valve 43; Described prime three-way valve outlet is communicated with described reference batcher one end, the other end of described reference batcher and described rear class three-way valve inlet communication, an outlet of described rear class three-way valve is communicated with the inlet valve of confined space, and another outlet of described rear class three-way valve is communicated with reference entrance with an entrance of prime three-way valve described in reference outlet;
Described reference transporter comprises inert gas pumping plant 441 and inert gas entrance 44, and described inert gas entrance is connected with another entrance of described prime three-way valve;
The entrance of described confined space is provided with valve 48.
When lambda sensor needs timing signal, the reference entrance 45 controlling prime three-way valve 41 is opened, and inert gas entrance 44 is closed, and the reference outlet 46 controlling rear class three-way valve 43 is opened, the valve 48 being communicated with confined space is closed, and allows reference be full of reference batcher 42; Then the reference entrance 45 controlling prime three-way valve 41 is closed, and inert gas entrance 44 is opened, and the reference outlet 46 controlling rear class three-way valve 43 is closed, and the valve 48 being communicated with confined space is opened, and allows reference enter confined space 1, completes single injected sampling; Sample introduction can be repeatedly; Reference batcher 42 specification size can be multiple, and plurality of specifications can use satisfied different sample introduction accuracy requirement simultaneously.
Lambda sensor on-line proving device of the present invention is arranged on glove box, to measure the oxygen content in Glove box body.
Present invention also offers a kind of glove box, described glove box is provided with foregoing lambda sensor caliberating device.
Except the demarcation of oxygen sensor, the present invention also can be used as the sensor on-line proving of other gases, and principle and device are all identical.
Compared with prior art, the present invention achieves following beneficial effect:
1, the present invention proposes a kind of new scaling method, does not need sensor to shift out, and does not also need, by other calibrating instruments, only can demarcate with sensor self reading, thus not limit by condition, reduce instrument maintenance cost.
2, the present invention achieves the on-line proving of lambda sensor easily, does not need to use calibrating instrument.Because in fixed position, in air, oxygen content is fixing, therefore when using air for gas, does not also need to use other gases, thus achieves and can demarcate whenever and wherever possible, simplified condition, conveniently implements.
Accompanying drawing explanation
Structural representation when Fig. 1 a is the closedown of embodiment 1 lambda sensor on-line proving device, structural representation when Fig. 1 b is the unlatching of embodiment 1 lambda sensor on-line proving device; Wherein, 1 is confined space; 21 is reference locker rooms; 22 is outlets; 23 is injection ports; 51 is piston rods; 521 and 531 is two piston plates; 522 and 532 is the O-ring seals on two piston plates; 6 is cylinders.
Fig. 2 a is the structural representation of embodiment 2 when closing, and Fig. 2 b is the structural representation of embodiment 2 when opening; Wherein, 1 is confined space to be measured, and 23 is reference locker rooms, and 52 and 53 is two piston plates, and 71 is reference imported valves, and 72 is reference outlet valves.
Structural representation when Fig. 3 a is the closedown of embodiment 3 lambda sensor on-line proving device, structural representation when Fig. 3 b is the unlatching of lambda sensor on-line proving device; Wherein, 1 is confined space; 21 is piston plates; 22 is outlet one-way cocks; 23 is reference locker rooms; 24 is piston rods; 25 is reference injection ports; 26 is injection port one-way cocks.
Fig. 4 is the structural representation of embodiment 4; Wherein, 1 is confined space; 41 is prime three-way valves; 42 is reference batchers; 43 is rear class three-way valves; 44 is inert gas entrances; 45 is reference entrances; 46 is reference outlets; 47 is outlets that rear class three-way valve leads between confined space valve; 48 is confined space inlet valves.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is further described, but the present invention is not limited to these embodiments.
Embodiment 1,
Illustrate with air a kind of lambda sensor caliberating device when being gas below.Structural representation when described lambda sensor caliberating device is closed as shown in Figure 1a, comprises O-ring seal 522 and 532, the cylinder 6 on reference locker room 21, outlet 22, injection port 23, piston rod 51, two piston plates 521 and 531, two piston plates.Wherein, certain volumetric spaces is formed between two piston plates 521,531 and reference locker room 21; Two piston plates are equipped with O-ring seal 522 and 532, play sealing function, for sealing the gas of certain volume amount up for safekeeping; Cylinder 6 control piston bar 51 is mobile in reference locker room 21, realizes opening and closing.
The lambda sensor caliberating device of embodiment 1 is installed on glove box, then the lambda sensor be arranged on equally on glove box is demarcated.
As Fig. 1 a, when cylinder 6 is not ventilated, be in closed condition, reference locker room 21 and contact air, isolated with Glove box body inside; Ventilation makes cylinder 6 open, promote piston rod 51 and be moved upward to unlatching maximum rating in reference locker room 21, as Fig. 1 b, now reference locker room 21 is connected with glove box, be isolated with air, a certain amount of like this air, namely oxygen reference is just incorporated in glove box from injection port through outlet, completes single injected sampling.Can sample introduction repeatedly, number of injections n.
Glove box volume Vg can calculate, reference and content of oxygen in air Cs known, the volumetric spaces Vs of inside, reference locker room 21 is a fixed value, thus introduce oxygen content that air formed in theory rising amount Δ Ct can calculate:
ΔCt＝Cs×Vs/Vg
Δ Ct is the theoretical value of oxygen content change;
Cs is content of oxygen in air;
Vs is the air capacity injected;
Vg is the volume of confined space, is the volume in Glove box body herein.
The lambda sensor simultaneously recorded on glove box is introducing the data before and after air, calculate the variation delta Co of reading on lambda sensor, then more whether rising amount Δ Ct is consistent with variation delta Co on lambda sensor, if two data consistents illustrate that lambda sensor is accurately, if the larger explanation lambda sensor of difference goes wrong.
In order to improve the accuracy of demarcation, different volumes air can also be injected and carry out multi-point calibration, or carrying out repeated multiple times demarcation.
Cylinder is the device of piston rod movement, and other modes also can be adopted to drive, as manual, electronic.
O-ring seal also can adopt other modes to replace.
Embodiment 2
As the another kind of mode of embodiment 1, the reference locker room of described lambda sensor caliberating device is also connected with reference imported valve 71 and reference outlet valve 72.
When lambda sensor needs timing signal, reference imported valve 71 is opened, and reference outlet valve 72 is closed, and allows reference be full of reference locker room; Piston rod 51 moves up, and reference is pushed confined space as in Glove box body; Then reference imported valve is closed, and reference outlet valve is opened, and completes single injected sampling; Sample introduction can be repeatedly.
Embodiment 3
A kind of lambda sensor on-line proving device, comprise reference apotheca and reference transporter, structure as shown in Figure 2 a and 2 b.State when Fig. 2 a is device closedown, state when Fig. 2 b is device unlatching.
Perfusor piston, the piston plate 21 comprising piston rod 24 and be arranged on piston rod, piston plate 21 mates with reference apotheca 23 inner wall sealing, and piston plate 21 and reference apotheca 23 inwall form the pick up and store space of quantitative reference;
The other end of reference locker room 23 is connected with outlet, and injection port 25 and outlet are provided with one-way cock, and injection port 25 one end connects reference gas source, and as gas, the other end connects one-way cock 26; When piston plate 21 is positioned at bottom reference locker room or when being moved bottom reference locker room by outlet end, injection port one-way cock 26 is opened, outlet one-way cock 22 is closed simultaneously; When piston plate 21 is by when moving to outlet bottom reference locker room, injection port one-way cock 26 is closed, and outlet one-way cock 22 is opened simultaneously, completes single injected sampling.
Also can configuration driven device as required, for promoting the quantitative reference that perfusor piston moves to transport in reference storage space.
Same, the volume Vg of confined space can calculate, and in reference, oxygen content Cs is known, and the volumetric spaces Vs of inside, reference locker room 23 is a fixed value, thus introduce oxygen content that reference formed in theory rising amount Δ Ct can calculate:
ΔCt＝Cs×Vs/Vg
Δ Ct is the theoretical value of oxygen content change;
Cs is oxygen content in reference;
Vs is the reference amount injected;
Vg is the volume of confined space.
The lambda sensor simultaneously recorded on confined space is introducing the data before and after reference, calculate the variation delta Co of reading on lambda sensor, then more whether rising amount Δ Ct is consistent with variation delta Co on lambda sensor, if two data consistents illustrate that lambda sensor is accurately, if the larger explanation lambda sensor of difference goes wrong.
In order to improve the accuracy of demarcation, different volumes reference sample can also be injected and carry out multi-point calibration, or carrying out repeated multiple times demarcation.
Embodiment 4
A kind of lambda sensor on-line proving device, comprises reference locker room and reference transporter.
Reference locker room comprises reference batcher 42, reference entrance 45, prime three-way valve 41, reference outlet 46, rear class three-way valve 43, the outlet of prime three-way valve is communicated with reference batcher one end, the other end of reference batcher and rear class three-way valve inlet communication, an outlet of rear class three-way valve is communicated with the inlet valve of confined space 1, another outlet of rear class three-way valve exports 46 with reference and is communicated with, an entrance of prime three-way valve is communicated with reference entrance 45, another entrance of prime three-way valve is communicated with inert gas entrance 44,
Reference transporter comprises inert gas pumping plant 441 and inert gas entrance 44, and inert gas entrance 44 is connected with another entrance of prime three-way valve;
The entrance of confined space is provided with valve 48.
When lambda sensor needs timing signal, the reference entrance 45 controlling prime three-way valve 41 is opened, and inert gas entrance 44 is closed, and the reference outlet 46 controlling rear class three-way valve 43 is opened, the valve 48 being communicated with confined space is closed, and allows reference be full of reference batcher 42; Then the reference entrance 45 controlling prime three-way valve 41 is closed, and inert gas entrance 44 is opened, and the reference outlet 46 controlling rear class three-way valve 43 is closed, and the valve 48 being communicated with confined space is opened, and allows reference enter confined space 1, completes single injected sampling; Sample introduction can be repeatedly; Reference batcher 42 specification size can be multiple, and plurality of specifications can use satisfied different sample introduction accuracy requirement simultaneously.
Same, the volume Vg of confined space can calculate, in reference oxygen sample and reference, oxygen content Cs is known, and the volumetric spaces Vs of reference batcher 42 inside is a fixed value, thus introduce oxygen content that reference formed in theory rising amount Δ Ct can calculate:
ΔCt＝Cs×Vs/Vg
The lambda sensor simultaneously recorded on confined space is introducing the data before and after reference, calculate the variation delta Co of reading on lambda sensor, then more whether rising amount Δ Ct is consistent with variation delta Co on lambda sensor, if two data consistents illustrate that lambda sensor is accurately, if the larger explanation lambda sensor of difference goes wrong.
The invention provides a kind of lambda sensor caliberating device, the on-line proving of lambda sensor can be realized easily, do not need to use calibrating instrument.Because in fixed position, in air, oxygen content is fixing, therefore when using air for gas, does not also need to use other gases, thus achieves and can demarcate whenever and wherever possible, simplified condition, conveniently implements.
The present invention also can be used as the sensor on-line proving of other gases, and principle and device are all identical.
Above-described is only the preferred embodiment of the present invention, it should be pointed out that for the person of ordinary skill of the art, and without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (11)
1. a lambda sensor scaling method, it is characterized in that, described lambda sensor scaling method is with the changing value of oxygen content in confined space for theoretical value, with the reading of the lambda sensor be connected with confined space for measured value, measured value and theoretical value is contrasted thus completes the demarcation of lambda sensor.
2. lambda sensor scaling method as claimed in claim 1, is characterized in that, the reference of known volume is injected known volume confined space, and the oxygen content change formulae discovery in confined space draws, is namely theoretical value; Reading on lambda sensor is measured value; By theoretical value compared with measured value, the demarcation to lambda sensor can be completed.
3. lambda sensor scaling method as claimed in claim 2, it is characterized in that, described formula is Δ Ct=Cs × Vs/Vg;
Wherein, Δ Ct is the theoretical value of oxygen content change;
Cs is oxygen content in reference;
Vs is the reference amount injected;
Vg is the volume of confined space.
4. the lambda sensor scaling method as described in as arbitrary in claims 1 to 3, it is characterized in that, described reference is air, or the gas that any oxygen content is known.
5. a lambda sensor on-line proving device, for injecting quantitative reference to single or multiple in confined space, described lambda sensor on-line proving device is provided with injection port and outlet, and described outlet and described confined space are tightly connected, and described lambda sensor on-line proving device also comprises:
Reference locker room, is connected with described injection port, for extracting and store quantitative reference;
Reference transporter, for being transported to the quantitative reference in described reference locker room in described confined space.
6. lambda sensor on-line proving device as claimed in claim 5, it is characterized in that, described reference transporter comprises:
Perfusor piston, comprise piston rod and be arranged at two piston plates on piston rod, described two piston plates mate with reference locker room inner wall sealing, and described two piston plates and reference locker room inwall form the pick up and store space of quantitative reference;
Reference locker room, one end open is arranged in confined space as outlet, and the other end is communicated with reference, and its inner wall size seals with described two piston plates mates, and the length of described reference locker room is more than or equal to the distance between two piston plates.
7. lambda sensor on-line proving device as claimed in claim 6, it is characterized in that, described reference locker room is also connected with reference imported valve and reference outlet valve.
8. lambda sensor on-line proving device as claimed in claim 5, it is characterized in that, described reference transporter comprises:
Perfusor piston, comprise piston rod and be arranged at the piston plate on piston rod, described piston plate mates with reference locker room inner wall sealing, and described piston plate and reference locker room inwall form the pick up and store space of quantitative reference;
The other end of described reference locker room is connected with described outlet, described injection port and outlet are provided with one-way cock, when piston plate is positioned at bottom reference locker room or when being moved bottom reference locker room by outlet end, injection port one-way cock is opened, and outlet one-way cock is closed simultaneously; When piston plate is by when moving to outlet bottom reference apotheca, injection port one-way cock is closed, and outlet one-way cock is opened simultaneously.
9. lambda sensor on-line proving device as claimed in claim 5, is characterized in that, described reference locker room comprises reference batcher, reference entrance, prime three-way valve, reference outlet, rear class three-way valve; Described prime three-way valve outlet is communicated with described reference batcher one end, the other end of described reference batcher and described rear class three-way valve inlet communication, an outlet of described rear class T-valve is communicated with the inlet valve of confined space, another outlet of described rear class three-way valve and reference outlet, an entrance of described prime three-way valve is communicated with reference entrance;
Described reference transporter comprises inert gas pumping plant and inert gas entrance, and described inert gas entrance is connected with another entrance of described prime three-way valve;
The entrance of described confined space is provided with valve.
10. the lambda sensor on-line proving device as described in as arbitrary in claim 5 ~ 9, it is characterized in that, described lambda sensor on-line proving device is arranged on glove box.
11. 1 kinds of glove boxes, is characterized in that, described glove box be provided with as arbitrary in claim 5 ~ 9 as described in lambda sensor on-line proving device.
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| CN201410663262.6A CN104374879B (en) | 2014-11-19 | 2014-11-19 | Oxygen sensor calibration method and on-line calibration device |
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| EP3109635A1 (en) * | 2015-06-24 | 2016-12-28 | Don Whitley Scientific Limited | Sensor calibration system and method for a controlled atmosphere workstation |
| GB2569901A (en) * | 2015-06-24 | 2019-07-03 | Whitley Don Scient Ltd | Sensor calibration system and method for a controlled atmosphere workstation |
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| CN104374879B (en) | 2017-01-18 |
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