CN202903754U - Inlet gas path automatic control structure of flame ionization detector of gas chromatograph - Google Patents
Inlet gas path automatic control structure of flame ionization detector of gas chromatograph Download PDFInfo
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- CN202903754U CN202903754U CN 201220627937 CN201220627937U CN202903754U CN 202903754 U CN202903754 U CN 202903754U CN 201220627937 CN201220627937 CN 201220627937 CN 201220627937 U CN201220627937 U CN 201220627937U CN 202903754 U CN202903754 U CN 202903754U
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- gas circuit
- automatic control
- control structure
- flame ionization
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Abstract
The utility model relates to an inlet gas path automatic control structure of a flame ionization detector of a gas chromatograph, which comprises an air path, a hydrogen gas path and a make-up gas path, wherein the air path is connected to the detector, and the hydrogen gas path and the make-up gas path are connected together and then are connected to the detector. The inlet gas path automatic control structure is characterized in that filter elements are installed on gas inlets of the three gas paths, proportional valves are installed on gas outlet pipes of the filter elements, pressure sensors are installed on gas outlet pipes of the proportional valves, current limiters are installed on gas outlet pipes of the pressure sensors, the current limiters are installed on a front section of a gas inlet of the detector, and pressure control rings are installed between the proportional valves and the pressure sensors. By using the inlet gas path automatic control structure, the disadvantages of complex regulation and low accuracy of the existing traditional gas flow regulating mode are overcome, automatic control over inlet gas flow is realized, and the sensitivity of the detector is guaranteed.
Description
Technical field
The utility model relates to technical field of analytical instruments, specifically just relates to the flame ionization detector in the gas chromatograph, and especially flame ionization detector air inlet gas circuit realizes the automatically structure of control.
Background technology
Gas chromatograph is the instrument that material is carried out qualitative and quantitative analysis with vapor-phase chromatography, be used for carrying out analyzing and testing to respectively forming to divide in the mixed gas, gas chromatograph is a kind of separation, analysis tool of many mixture, it is take gas as mobile phase, adopts the column chromatography technology of douche.When the amalyzing substances of many components enters into chromatographic column, because the gas phase of each component in chromatographic column is different with the partition factor between the immobile liquid liquid phase, therefore each component is also just different in the travelling speed of chromatographic column, through behind certain column length, order is left chromatographic column and is entered detecting device, be converted to afterwards after testing electric signal and deliver to the data processing work station, thereby finished the qualitative and quantitative analysis to measured matter.Gas chromatograph is used very wide at aspects such as oil, chemical industry, biological chemistry, medical and health, food industry, environmental protection.It is except being used for quantitatively and the qualitative analysis, can also fixing the physicochemical constants such as partition factor, activity coefficient, molecular weight and specific surface area of going up mutually by working sample.
Gas chromatograph system comprises five large ingredients: air-channel system, sampling system, piece-rate system, temperature control system and detection record system, the control of carrier gas flux directly has influence on the sensitivity of detecting device and the stability of detection signal in its air-channel system.In the detecting device of present gas chromatograph, the most frequently used a kind of detecting device is exactly flame ionization detector, the normal combustion of the hydrogen flame of flame ionization detector is the prerequisite of detecting device normal operation, and therefore hydrogen and combustion air flow being controlled is the important indicator that guarantees the stable raising accuracy of detection of carrier gas flux.
In traditional gas chromatograph flame ionization detector, every road gas all is to be flowed out by steel cylinder first, after reduction valve is depressured to required pressure, make gas purification by the purge drying pipe, again through pressure maintaining valve and spinner-type flowmeter, come adjusting gas flow by the aperture size of manual control mechanical valve, also need to detect gas flow at each several part by special gas meter simultaneously and whether reach normal value, at last with stable pressure, constant flow and the sample mix of gasification, sample gas brought in the chromatographic column separate.This method of operating is more loaded down with trivial details, and the control accuracy of mechanical valve is not high enough simultaneously, and then affects the sensitivity of detecting device or even go out peak area.
The utility model content
Technical barrier to be solved in the utility model is loaded down with trivial details for the air inlet gas path control method of existing gas chromatograph flame ionization detector, the manual control precision is not high, affect the defective of detector sensitivity, the utility model provides gas chromatograph flame ionization detector air inlet gas circuit automatic control structure, realize the automatic control to charge air flow, guaranteed the sensitivity of detecting device.
Technical scheme
In order to solve the problems of the technologies described above, the utility model designs a kind of gas chromatograph flame ionization detector air inlet gas circuit automatic control structure, it comprises the air gas circuit, hydrogen gas circuit and make-up gas? gas circuit, the air gas circuit is received on the detecting device, the hydrogen gas circuit with receive together detecting device after the tail gas gas circuit is connected, it is characterized in that: described three tunnel gas circuit air intake opening places are equipped with filter core, on the filter core outlet pipe proportioning valve is installed, on the proportioning valve outlet pipe pressure transducer is installed, restrictor 8 is installed on the pressure transducer outlet pipe, 8 '; 8 " restrictor is installed in detecting device air intake opening leading portion, and the pressure control loop is housed between described proportioning valve and the pressure transducer.
Described three gas circuit air intake opening gaseous tensions are at 3 kilograms.
Described filter core is metal net mask, and the guard aperture is 0.005～0.010mm.
Described pressure transducer is the Honeywell pressure transducer.
Described restrictor is the vapour lock in 0.0050～0.0010mm aperture.
Beneficial effect
The utility model mainly makes gas flow control finish regulating rotary by simple manual intervention and is changed to and transfers to electronic control part fully and finish, it is loaded down with trivial details to have changed the adjusting that present traditional adjusting gas flow mode exists, the shortcoming that precision is not high, selected high-precision pressure transducer, the vapour lock of selecting to be fit to gas with various density and flow range is done restrictor, adopted the miniature precision electromagnetic proportional valve of suitable small-flow gas control, finished the conversion between gaseous tension and the gas flow, realize the automatic control to charge air flow, guaranteed the sensitivity of detecting device.
Description of drawings
Accompanying drawing 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
As shown in Figure 1, a kind of gas chromatograph flame ionization detector air inlet gas circuit automatic control structure, it comprises air gas circuit 1, hydrogen gas circuit 2 and make-up gas? gas circuit 3, air gas circuit 1 is received on the detecting device 4, hydrogen gas circuit 2 is connected with the tail gas gas circuit and is received together detecting device 4 after connecting, it is characterized in that: described three gas circuit air intake opening places are equipped with filter core 5,5 '; 5 " filter core 5,5 '; 5 " proportioning valve 6 is installed on the outlet pipe, 6 '; 6 " proportioning valve 6,6 '; 6 " pressure transducer 7 is installed on the outlet pipe, 7 '; 7 " pressure transducer 7,7 '; 7 " restrictor 8 is installed on the outlet pipe, 8 '; 8 " restrictor 8,8 '; 8 " be installed in detecting device 4 air intake opening leading portions, described proportioning valve 6,6 '; 6 " with pressure transducer 7,7 '; 7 " between pressure control loop 9 is housed, 9 '; 9 "
Described three gas circuit air intake opening gaseous tensions are at 3 kilograms.
Described filter core 5,5 ', 5 " be metal net mask, the guard aperture is 0.005～0.010mm.
Described pressure transducer 7,7 ', 7 " be the Honeywell pressure transducer.
Described restrictor 8,8 ', 8 " be the vapour lock in 0.0050mm aperture.
The utility model mainly makes gas flow control finish regulating rotary by simple manual intervention and is changed to and transfers to electronic control part fully and finish, it is loaded down with trivial details to have changed the adjusting that present traditional adjusting gas flow mode exists, the shortcoming that precision is not high, selected high-precision pressure transducer, the vapour lock of selecting to be fit to gas with various density and flow range is done restrictor, adopted the miniature precision electromagnetic proportional valve of suitable small-flow gas control, finished the conversion between gaseous tension and the gas flow, realize the automatic control to charge air flow, guaranteed the sensitivity of detecting device.
Claims (5)
1. gas chromatograph flame ionization detector air inlet gas circuit automatic control structure, it comprises air gas circuit (1), hydrogen gas circuit (2) and make-up gas? gas circuit (3), air gas circuit (1) is received on the detecting device (4), hydrogen gas circuit (2) is connected 3 with the tail gas gas circuit) receive together detecting device (4) after connecting, it is characterized in that: described three tunnel gas circuit air intake opening places are equipped with filter core (5,5 '; 5 "), filter core (5,5 '; 5 ") proportioning valve (6 is installed on the outlet pipe, 6 '; 6 "), proportioning valve (6,6 '; 6 ") pressure transducer (7 is installed on the outlet pipe, 7 '; 7 "), pressure transducer (7,7 '; 7 ") restrictor (8 is installed on the outlet pipe, 8 '; 8 "), restrictor (8,8 '; 8 ") be installed in detecting device (4) air intake opening leading portion, described proportioning valve (6,6 '; 6 ") and pressure transducer (7,7 '; 7 ") between pressure control loop (9 is housed, 9 '; 9 ").
2. a kind of gas chromatograph flame ionization detector air inlet gas circuit automatic control structure as claimed in claim 1, it is characterized in that: described three tunnel gas circuit air intake opening gaseous tensions are at 3 kilograms.
3. a kind of gas chromatograph flame ionization detector air inlet gas circuit automatic control structure as claimed in claim 1 is characterized in that: and described filter core (5,5 ', 5 ") be metal net mask, the guard aperture is 0.005～0.010mm.
4. a kind of gas chromatograph flame ionization detector air inlet gas circuit automatic control structure as claimed in claim 1 is characterized in that: and described pressure transducer (7,7 ', 7 ") be the Honeywell pressure transducer.
5. a kind of gas chromatograph flame ionization detector air inlet gas circuit automatic control structure as claimed in claim 1 is characterized in that: described restrictor (8,8 ', 8 ") is the vapour lock in 0.0050mm aperture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220627937 CN202903754U (en) | 2012-11-23 | 2012-11-23 | Inlet gas path automatic control structure of flame ionization detector of gas chromatograph |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220627937 CN202903754U (en) | 2012-11-23 | 2012-11-23 | Inlet gas path automatic control structure of flame ionization detector of gas chromatograph |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202903754U true CN202903754U (en) | 2013-04-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220627937 Expired - Fee Related CN202903754U (en) | 2012-11-23 | 2012-11-23 | Inlet gas path automatic control structure of flame ionization detector of gas chromatograph |
Country Status (1)
| Country | Link |
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| CN (1) | CN202903754U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018381A (en) * | 2012-11-23 | 2013-04-03 | 上海仪电分析仪器有限公司 | Automatic control structure for gas chromatograph flame ionization detector air inlet path |
| CN115469048A (en) * | 2022-11-03 | 2022-12-13 | 广东铭沁环保科技有限公司 | FID (flame ionization detector) for supplying pure water by electrolysis |
-
2012
- 2012-11-23 CN CN 201220627937 patent/CN202903754U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018381A (en) * | 2012-11-23 | 2013-04-03 | 上海仪电分析仪器有限公司 | Automatic control structure for gas chromatograph flame ionization detector air inlet path |
| CN115469048A (en) * | 2022-11-03 | 2022-12-13 | 广东铭沁环保科技有限公司 | FID (flame ionization detector) for supplying pure water by electrolysis |
| CN115469048B (en) * | 2022-11-03 | 2023-09-01 | 广东铭沁环保科技有限公司 | FID tester for pure water electrolysis and gas supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130424 Termination date: 20151123 |