CN104297388B - Sampling device - Google Patents
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- CN104297388B CN104297388B CN201410570940.4A CN201410570940A CN104297388B CN 104297388 B CN104297388 B CN 104297388B CN 201410570940 A CN201410570940 A CN 201410570940A CN 104297388 B CN104297388 B CN 104297388B
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Abstract
The present invention relates to a kind of sampling device, relate to a kind of sampling device for gas chromatograph.The sampling device of the present invention is provided with six-way valve, this six-way valve can flow through the direction of chromatographic column by changing carrier gas, thus realize the blowing function to chromatographic column, significantly reduce the pollution of chromatographic column, decrease the interference that next sample gas is measured by a sample gas residual, when particularly separating the component of the big polarity of higher boiling, effect is especially apparent, this improves the accuracy of sample gas detection, improve the life-span of chromatographic column.Additionally, present invention further introduces ten-way valve, thus realize measuring two kinds of different materials of same sample gas simultaneously, substantially increase operating efficiency.
Description
Technical field
The present invention relates to a kind of sampling device.
Background technology
Currently for the detection of NMHC, great majority enter according to the method described in Chinese Ministry of Environmental Protection's standard HJ/T38-1999
Row is analyzed, but the analysis sample introduction to be separated of existing gas chromatograph, total hydrocarbon and methane, individually to analyze, reappearance is poor.By
The component residence time in the chromatography column of the big polarity of higher boiling in sample gas is longer, easily disturbs dividing of next sample gas
Analysis, and easily pollutes chromatographic column, shortens chromatographic column service life.
Summary of the invention
In view of this, when being necessary in fact to provide one to be applied to chromatograph, single injected sampling can measure simultaneously two kinds of compositions and
Improve the sampling device in chromatographic column service life.
Additionally, the present invention also provides for the application of this sampling device a kind of.
The purpose of the present invention is achieved through the following technical solutions:
A kind of sampling device, the gas chromatograph being used for being to be provided with the first chromatographic column, the second chromatographic column and fid detector carries
For sample gas to be detected, described sampling device includes ten-way valve, six-way valve, the first quantitative loop and the second quantitative loop；
Described ten-way valve is provided with ten openings, the respectively the tenth opening, the first opening, the second opening, the 3rd opening, the 4th
Opening, the 5th opening, the 6th opening, the 7th opening, the 8th opening and the 9th opening, described tenth opening is that sample gas to be measured is entered
Mouthful, described 9th opening is sample gas to be measured outlet；Described second opening and described 6th opening are carrier gas inlet；Described first opens
Mouth is connected by pipeline with described 4th opening, and described 5th opening is connected by pipeline with described 8th opening；Described first
Quantitative loop is located on the pipeline between the first opening and described 4th opening；Described second quantitative loop be located at described 5th opening with
On pipeline between described 8th opening；Described 3rd opening is used for connecting described gas chromatograph；
Described six-way valve is provided with six perforates, the respectively first perforate, the second perforate, the 3rd perforate, the 4th perforate, and the 5th
Perforate and the 6th perforate；Described 7th opening is connected with described 6th perforate pipeline；Described first perforate, the second perforate, the 3rd
Perforate, the 4th perforate are used to connect described gas chromatograph；
Described first quantitative loop and described second quantitative loop are for the most temporary sample gas to be measured；
Described six-way valve may select state one and state two；During detection, described six-way valve is in state one, and carrier gas divides two-way
Entering described ten-way valve, a road flows through described second opening, the first opening, the first quantitative loop, the 4th opening successively, the 3rd opens
Mouth, the second chromatographic column, deliver to described fid detector detection；Another road flow through successively described 6th opening, the 5th opening, second
Quantitative loop, the 8th opening, the 7th opening, the 6th perforate, the first perforate, flow through (as shown in Fig. 2 direction of arrow) in the first direction
Fid detector detection is delivered in described first chromatographic column, the 3rd perforate, the 4th perforate；
During blowback, described six-way valve is in state two, and carrier gas divides two-way to enter described ten-way valve, and a road flows through described successively
Second opening, the first opening, the first quantitative loop, the 4th opening, the 3rd opening, the second chromatographic column and fid detector；Another road depends on
Secondary flow through described 6th opening, the 5th opening, the second quantitative loop, the 8th opening, the 7th opening, the 6th perforate, the 3rd perforate, edge
Second direction (shown in Fig. 3 direction of arrow) flow through as described in the first chromatographic column, as described in the first perforate, the second perforate and FID detection
Device, described second direction is opposite to the first direction, when carrier gas is flowed in a second direction, can remove described first chromatographic column
In impurity.
Preferably, described sampling device farther includes flow controller, and carrier gas is divided into first by described flow controller
Branch road and the second branch road, described first branch road is connected by pipeline and the second opening, and described second branch road passes through pipeline and the 6th
Opening connects.
Preferably, described sampling device farther includes molecular sieve filtration pipe, and described carrier gas is filtered through molecular sieve filtration pipe
Laggard inbound traffics controller.
Preferably, the state switching of described six-way valve is switched over by manually or automatically mode.
Preferably, described sampling device is further provided with ecp assembly, and described ecp assembly is used for controlling institute
State the state switching of six-way valve.
The application of a kind of above-mentioned sampling device, it is characterised in that this sampling device is applied to the detection of NMHC.
Preferably, described sampling device farther includes flow controller, and carrier gas is divided into first by described flow controller
Branch road and the second branch road, described first branch road is connected by pipeline and the second opening, and described second branch road passes through pipeline and the 6th
Opening connects.
Preferably, described sampling device farther includes molecular sieve filtration pipe, and described carrier gas is filtered through molecular sieve filtration pipe
Laggard inbound traffics controller.
Preferably, the state switching of described six-way valve is switched over by manually or automatically mode.
Preferably, described sampling device is further provided with ecp assembly, and described ecp assembly is used for controlling institute
State the state switching of six-way valve.
Compared with prior art, sampling device of the present invention has the advantages that
(1) sampling device of the present invention is provided with six-way valve, and this six-way valve can flow through the side of chromatographic column by changing carrier gas
To, thus realize the blowing function to chromatographic column, significantly reduce the pollution of chromatographic column, decrease a sample gas and remain next
The interference that individual sample gas is measured, when particularly separating the component of the big polarity of higher boiling, effect is especially apparent, and this improves sample gas
The accuracy of detection, extends the life-span of chromatographic column.
(2) additionally, present invention further introduces ten-way valve, thus realize measuring two kinds of different materials of same sample gas simultaneously,
Substantially increase operating efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the quantitative state of chromatographic analysis system sample gas of present pre-ferred embodiments.
Fig. 2 is the structural representation of the chromatographic analysis system detection state of present pre-ferred embodiments.
Fig. 3 is the structural representation of the chromatographic analysis system blowback state of present pre-ferred embodiments.
Fig. 4 is the structural representation of the chromatographic analysis system sample gas detection state of another embodiment of the present invention.
Fig. 5 is the structural representation of the chromatographic analysis system blowback state of another embodiment of the present invention.
Here the component names corresponding to each reference is listed:
400 chromatographic analysis system 10 flow controllers
100 sampling device 11 first branch roads
13 second branch road 515 the 5th perforates
30 ten-way valve 516 the 6th perforates
311 first opening 60 second quantitative loop
312 second opening 70 molecular sieve filtration pipes
313 the 3rd opening 90 ecp assemblies
314 the 4th opening 901 entrances
315 the 5th opening 200 gas chromatographs
316 the 6th opening 210 first chromatographic columns
317 the 7th opening 211 first ends
318 the 8th opening 213 the second ends
319 the 9th opening 230 second chromatographic columns
310 the tenth opening 231 first ports
40 first quantitative loop 233 second ports
50 six-way valve 250 damping columns
511 first perforate 251 first ends
512 second perforate 253 the second ends
513 the 3rd perforate 270 fid detectors
514 the 4th perforate 290 injection ports
Detailed description of the invention
As a example by the chromatographic analysis system of the present invention is for detection gas, in the preferred embodiment, should with it
It is illustrated as a example by measuring the NMHC in air and waste gas.
As the chromatographic analysis system 400 of Fig. 1 present pre-ferred embodiments includes sampling device 100 and gas chromatograph 200,
Described sampling device 100 provides gas to be detected or carrier gas for gas chromatograph 200.Described gas chromatograph 200 includes first
Chromatographic column the 210, second chromatographic column 230, damping column 250 and flame ionization ditector (Flame Ionization
Detector, fid detector) 270.Described sampling device 100 includes flow controller 10, ten-way valve 30 and six-way valve 50.Inspection
During survey, flow through described flow controller 10 carrier gas formed tow channel gas stream respectively after ten-way valve 30, a road air-flow will treat test sample
Air-blowing is delivered to FID detector 270 after entering the second chromatographic column 230 and damping column 250 and is detected；Another road air-flow is by sample gas to be measured
After damping column 250, deliver to FID detector 270 after being blown into six-way valve 50 and the first chromatographic column 210 detect, it is achieved thereby that
Detect while two kinds of components in same sample gas.
Described ten-way valve 30 is used for described first chromatographic column 210 and described second chromatographic column 230 being carried out sample introduction simultaneously, from
And realize in single injected sampling, detect two kinds of different components in sample gas, containing of such as detection Determination of Total Hydrocarbon In Atomsphere and methane simultaneously
Amount.Described six-way valve 50 is used for controlling gas flow direction, it is achieved from forward, sample gas is delivered to described first chromatographic column 210 and carries out
Separate detection, carrier gas is reversely sent into described first chromatographic column 210, described first chromatographic column 210 is carried out blowback, to remove look
The sample gas of residual in spectrum post.
Described six-way valve 50 is for controlling the direction of the first chromatographic column 210 described in airflow passes, and forward flows through and carries out sample gas
Separate；Flow counterflow through and described first chromatographic column 210 is carried out blowback.The present invention realizes polarity look by increasing six-way valve 50
The sample gas of residual is removed in the blowback of spectrum post, improves the accuracy of sample gas detection, extends the life-span of polarity chromatographic column.
Described flow controller 10 includes the first branch road 11 and the second branch road 13, in the preferred embodiment, institute
State the first branch road 11 identical with the air pressure of the second branch road 13.Preferably, the pressure of the first branch road 11 and the second branch road 13 is
80kpa.Described ten-way valve 30 is provided with ten openings, the respectively the tenth opening the 310, first opening the 311, second opening the 312, the 3rd
Opening the 313, the 4th opening the 314, the 5th opening the 315, the 6th opening the 316, the 7th opening the 317, the 8th opening 318 and the 9th opening
319.Described tenth opening 310 is sample gas import, and described 9th opening 319 exports for sample gas.Described second opening 312 and described
6th opening 316 is carrier gas inlet.Described first opening 311 is connected by pipeline (figure is not marked) with described 4th opening 314,
Pipeline between described first opening 311 and described 4th opening 314 is provided with the first quantitative loop 40；Described 5th opening 315
It is connected by pipeline with described 8th opening 318, on the pipeline between described 5th opening 315 and described 8th opening 318
It is provided with the second quantitative loop 60.Described first quantitative loop 40 and described second quantitative loop 60 are for the most temporary sample gas to be measured.
Described ten-way valve 30 has the first state (as shown in Figure 1) and the second state (as shown in Figure 2), described first state
And can switch between described second state.Described switching both can manually control, it is also possible to passes through electric controlled pneumatic control
Realize.When described ten-way valve 30 is in described first state, sample gas is injected from described tenth opening 310, is flowed through institute successively
State the first opening 311, described first quantitative loop 40, described 4th opening 314, described 5th opening 315, described second quantitative loop
60, described 8th opening 318, is finally flowed out by described 9th opening 319, this be sample gas quantitative time air flow direction process, gas
Flow path direction is as shown in Fig. 1 direction of arrow.
As in figure 2 it is shown, when described ten-way valve 30 is in described second state, carrier gas is flowed from described flow controller 10
Enter, form two-way gas.One road gas enters described second opening 312 from described first branch road 11, through described first opening
311, the sample gas in described first quantitative loop 40 is taken out of, flow through described 4th opening 314, described 3rd opening 313 successively, enter
Enter described second chromatographic column 230 separate after, through described damping column 250, finally enter fid detector and quantitatively detect.
Another road gas enters described 6th opening 316 from described second branch road 13, through described 5th opening 315, determines described second
Sample gas in amount ring 60 is taken out of, flows through described 8th opening 318, described 7th opening 317, described six-way valve 50 successively, enters
After described first chromatographic column 210 separates, through described damping column 250, finally enter fid detector and quantitatively detect.
Described six-way valve 50 is provided with six perforates, the respectively first perforate 511, the second perforate 512, the 3rd perforate 513, and
Four perforates 514, the 5th perforate 515 and the 6th perforate 516.Described six-way valve 50 has two states, and respectively state one is (such as figure
Shown in 2) and state two (as shown in Figure 3), can mutually switch between described state one and described state two.Described switching action
Both can manually control, it is also possible to realized by electric controlled pneumatic control.
As in figure 2 it is shown, described six-way valve 50 is in state one, lead to when air-flow flows into described six from described 7th opening 317
During valve 50, flow through successively described 6th perforate 516, described first perforate 511, forward enter described first chromatographic column 210 carry out
After separation, through described damping column 250, finally enter fid detector and quantitatively detect (i.e. detection process air flow direction).Such as figure
Shown in 3, described six-way valve 50 is in state two, when air-flow flows into described six-way valve 50 from described 7th opening 317, flows successively
Through described 6th perforate 516, described 3rd perforate 513, reversely flow into described first chromatographic column 210, then flow through described the successively
One perforate 511, described second perforate 512, described damping column 250, finally enter fid detector and discharge (the most anti-by residuals
Blow over journey air flow direction).
Described first chromatographic column 210 includes first end 211 and relative the second end 213.Described second chromatographic column 230
Including the first port 231 and the second relative port 233.Described damping column 250 includes first end 251 and the second relative end
Portion 253.In the preferred embodiment, described first chromatographic column 210 is polarity capillary column, and described polarity capillary column is three
Al 2 O capillary column or molecular sieve capillary column.Described second chromatographic column 230 and described damping column 250 are hollow capillary
Post.For using packed column, when described first chromatographic column 210 and described second chromatographic column 230 are capillary column, inspection
Carrier gas consumption required during survey is less, and chromatogram peak out is sharper, it is to avoid conditions of streaking, improves the accurate of sample gas separation
Degree.When described six-way valve 50 carries out state switching, the fluid flow in pipeline can be undergone mutation, and described damping column 250 is used for
Buffer fluid flow sudden change caused during the switching of described six-way valve 50 state, prevent described fid detector 270 from stopping working.Described
Fid detector 270 is for carrying out quantitative analysis to the outflow component after separating.
Described first branch road 11 is connected with described second opening 312 pipeline, described second branch road 13 and described 6th opening
316 pipelines connect.Described 7th opening 317 is connected with described 6th perforate 516 pipeline.The first of described first chromatographic column 210
End 211 is connected with described first perforate 511 pipeline.The second end 213 and described 3rd perforate of described first chromatographic column 210
513 pipelines connect.First port 231 of described second chromatographic column 230 is connected with described 3rd opening 313 pipeline.Described second
Second port 233 of chromatographic column 230 respectively with described second perforate 512, described 4th perforate 514, the of described damping column 250
Two end 253 pipelines connect.The first end 251 of described damping column 250 is connected with described fid detector 270 pipeline.
In the preferred embodiment, described sampling device 100 is further provided with molecular sieve filtration pipe 70, carrier gas warp
Cross and be delivered to flow controller 10 pipeline after molecule is sieved through the purification of chimney filter 70 and connect.
In the preferred embodiment, described sampling device 100 is further provided with ecp assembly 90.Described electricity
Control Pneumatic assembly 90 is provided with carrier gas inlet 901, and is connected with switching switch (not shown) pipeline of described six-way valve 50.When
When needing the state switching described six-way valve 50, starting carrier gas, described six-way valve 50 just promotes described six under the air pressure of carrier gas
Logical valve 50 switches between described state one and state two.
Sample gas dosing process: as it is shown in figure 1, described ten-way valve 30 is in described first state, sample gas is opened from the described tenth
Mouthfuls 310 inject, and flow through described first opening 311, described first quantitative loop 40, described 4th opening 314 successively, the described 5th open
Mouth 315, described second quantitative loop 60, described 8th opening 318, finally flowed out by described 9th opening 319, and this is that sample gas is quantitative
Time air flow direction process, airflow direction is as shown in Fig. 1 direction of arrow.When full described first quantitative loop 40 and described second is determined
During amount ring 60, stop sample introduction, complete dosing process.
Detection process: as in figure 2 it is shown, after quantitatively completing, described ten-way valve 30 is adjusted to described second state, by described
Six-way valve 50 adjusts to described state one.Carrier gas, such as nitrogen, after described molecular sieve filtration pipe 70 purifies, through described flow
Controller 10, forms two-way gas.One road gas enters described second opening 312 from described first branch road 11, through described first
Opening 311, the sample gas in described first quantitative loop 40 is taken out of, flow through described 4th opening 314, described 3rd opening successively
313, enter described second chromatographic column 230 separate after, through described damping column 250, finally enter fid detector and carry out quantitatively
Detection.Another road gas enters described 6th opening 316 from described second branch road 13, through described 5th opening 315, by described
Sample gas in two quantitative loop 60 is taken out of, flows through described 8th opening 318, described 7th opening 317, described 6th perforate successively
516, described first perforate 511, enters (forward entrance) described first look from the first end 211 of described first chromatographic column 210
After spectrum post 210 separates, through described damping column 250, finally enter fid detector and quantitatively detect.
Blowback process: as it is shown on figure 3, described ten-way valve 30 is still in described second state, described six-way valve 50 is adjusted
To state 2.Carrier gas, such as nitrogen, after described molecular sieve filtration pipe 70 purifies, through described flow controller 10, form two-way
Gas.One road gas enters described second opening 312 from described first branch road 11, through described first opening 311, by described first
Sample gas in quantitative loop 40 is taken out of, flows through described 4th opening 314, described 3rd opening 313 successively, enters described second chromatogram
After post 230 separates, through described damping column 250, finally enter fid detector and quantitatively detect.Another road gas is from institute
State the second branch road 13 and enter described 6th opening 316, through described 5th opening 315, by the sample gas in described second quantitative loop 60
Take out of, flow through successively described 8th opening 318, described 7th opening 317, described 6th perforate 516, described 3rd perforate 513,
After the second end 213 of described first chromatographic column 210 enters (being redirected back into) described first chromatographic column 210, flow through institute successively
State the first perforate 511, described second perforate 512, described damping column 250, finally enter fid detector and will remain in described first
Impurity in chromatographic column 210 is discharged..
As shown in Figure 4, in another embodiment of the invention, described chromatographic analysis system 400 includes six-way valve 50 and gas
Chromatography 200.
Described six-way valve 50 includes six perforates, the respectively first perforate 511, the second perforate 512, the 3rd perforate 513,
Four perforates 514, the 5th perforate 515 and the 6th perforate 516.Described six-way valve 50 has two states, and respectively state one is (such as figure
Shown in 4) and state two (as shown in Figure 5), can mutually switch between described state one and described state two.Described switching action
Both can manually control, it is also possible to realized by electric controlled pneumatic control.
Described gas chromatograph 200 includes the first chromatographic column 210, damping column 250, fid detector 270 and injection port 290.
Described first chromatographic column 210 includes first end 211 and relative the second end 213.Described damping column 250 includes first end
251 and relative the second end 253.In the preferred embodiment, described first chromatographic column 210 is polarity capillary column,
Described polarity capillary column is alundum (Al2O3) capillary column or molecular sieve capillary column.Described damping column 250 is hollow capillary column.
Described injection port 290 is connected with described 6th perforate 516 pipeline.The first end 211 of described first chromatographic column 210
It is connected with described first perforate 511 pipeline；The second end 213 and described 3rd perforate 513 pipeline of described first chromatographic column 210
Connect.The first end 251 of described damping column 250 is connected with described fid detector pipeline；Second end of described damping column 250
Portion 253 is connected with described second perforate 512, described 4th perforate 514 pipeline respectively.
In the preferred embodiment, described chromatographic analysis system 400 is further provided with molecular sieve filtration pipe 70, carries
Gas enters described six-way valve from described injection port after the purification of molecular sieve filtration pipe 70.
In the preferred embodiment, described chromatographic analysis system 400 is further provided with ecp assembly 90.Institute
State ecp assembly 90 and be provided with carrier gas inlet 901, and switch (not shown) pipeline even with the switching of described six-way valve 50
Connect.When needing the state switching described six-way valve 50, starting carrier gas, described six-way valve 50 just promotes institute under the air pressure of carrier gas
State six-way valve 50 to switch between described state one and state two.
Detection process: as shown in Figure 4, described six-way valve 50 is in described state one.Sample gas is entered from described injection port 290
Enter, successively through described 6th perforate 516, described first perforate 511, enter from the first end 211 of described first chromatographic column 210
After (forward entrance) described first chromatographic column 210 separates, through described damping column 250, finally enter fid detector and carry out determining
Amount detection.
Blowback process: as it is shown in figure 5, described six-way valve 50 is in described state two.Carrier gas, such as nitrogen, through described point
Son be sieved through chimney filter 70 purify after, flow through successively described injection port 290, described 6th perforate 516, described 3rd perforate 513, from institute
State the second end 213 of the first chromatographic column 210 enter (being redirected back into) described first chromatographic column 210 after, flow through described successively
One perforate 511, described second perforate 512, described damping column 250, finally enter fid detector and will remain in described first chromatogram
Impurity in post 210 is discharged.
The invention is not limited in above-mentioned embodiment, if various changes or deformation to the present invention are without departing from the present invention
Spirit and scope, if these are changed and within the scope of deformation belongs to claim or the equivalent technologies of the present invention, then this
Bright being also intended to comprises these changes and deformation.
Claims (4)
1. a sampling device, for the gas chromatograph offer for being provided with the first chromatographic column, the second chromatographic column and fid detector
Sample gas to be detected, it is characterised in that described sampling device includes ten-way valve, six-way valve, the first quantitative loop and the second quantitative loop；
Described ten-way valve is provided with ten openings, the respectively the tenth opening, the first opening, the second opening, the 3rd opening, the 4th opens
Mouth, the 5th opening, the 6th opening, the 7th opening, the 8th opening and the 9th opening, described tenth opening is sample gas import to be measured,
Described 9th opening is sample gas to be measured outlet；Described second opening and described 6th opening are carrier gas inlet；Described first opening
Being connected by pipeline with described 4th opening, described 5th opening is connected by pipeline with described 8th opening；Described first is fixed
Amount ring is located on the pipeline between described first opening and described 4th opening；Described second quantitative loop is located at described 5th opening
And on the pipeline between described 8th opening；Described 3rd opening is used for connecting described gas chromatograph；
Described six-way valve is provided with six perforates, the respectively first perforate, the second perforate, the 3rd perforate, the 4th perforate, the 5th perforate
And the 6th perforate；Described 7th opening is connected with described 6th perforate pipeline；Described first perforate, the second perforate, the 3rd perforate,
4th perforate is used to connect described gas chromatograph；
Described first quantitative loop and described second quantitative loop are for the most temporary sample gas to be measured；
Described six-way valve may select state one and state two；During detection, described six-way valve is in state one, and carrier gas divides two-way to enter
Described ten-way valve, a road flow through successively described second opening, the first opening, the first quantitative loop, the 4th opening, the 3rd opening,
Two chromatographic columns, deliver to described fid detector detection；Another road flows through described 6th opening, the 5th opening, second quantitative successively
Ring, the 8th opening, the 7th opening, the 6th perforate, the first perforate, in the first direction flow through described first chromatographic column, the 3rd perforate,
Fid detector detection is delivered in 4th perforate；
During blowback, described six-way valve is in state two, and carrier gas divides two-way to enter described ten-way valve, and a road flows through described second successively
Opening, the first opening, the first quantitative loop, the 4th opening, the 3rd opening, the second chromatographic column and fid detector；Another road is flowed successively
Through described 6th opening, the 5th opening, the second quantitative loop, the 8th opening, the 7th opening, the 6th perforate, the 3rd perforate, along second
Direction flows through described first chromatographic column, described first perforate, the second perforate and fid detector, described second direction and described the
One is in opposite direction, when carrier gas is flowed in a second direction, can remove the impurity in described first chromatographic column；
Described sampling device farther includes flow controller, and carrier gas is divided into the first branch road and second by described flow controller
Road, described first branch road is connected by pipeline and the second opening, and described second branch road is connected by pipeline and the 6th opening.
Sampling device the most according to claim 1, it is characterised in that described sampling device farther includes molecular sieve filtration
Pipe, described carrier gas filters laggard inbound traffics controller through molecular sieve filtration pipe.
3. according to the sampling device described in any one of claim 1-2, it is characterised in that the state of described six-way valve switches by hand
Dynamic or automated manner switches over.
Sampling device the most according to claim 1, it is characterised in that described sampling device is further provided with ecp group
Part, described ecp assembly is for controlling the state switching of described six-way valve.
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| CN109696495A (en) * | 2018-12-29 | 2019-04-30 | 苏州天蓝分析仪器有限公司 | A kind of VOC monitoring device and method that accurate quantification sampling may be implemented |
| CN114235941A (en) * | 2022-02-28 | 2022-03-25 | 华电智控（北京）技术有限公司 | Direct detection device and method for non-methane total hydrocarbons in ambient air |
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