CN201096760Y - Catalyzing and oxidation thermal resistance gas phase color spectrum detector - Google Patents
Catalyzing and oxidation thermal resistance gas phase color spectrum detector Download PDFInfo
- Publication number
- CN201096760Y CN201096760Y CNU2007201703118U CN200720170311U CN201096760Y CN 201096760 Y CN201096760 Y CN 201096760Y CN U2007201703118 U CNU2007201703118 U CN U2007201703118U CN 200720170311 U CN200720170311 U CN 200720170311U CN 201096760 Y CN201096760 Y CN 201096760Y
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Abstract
Disclosed is a tester for a gas chromatographic instrument, comprising a main body of a cavity structure made of non-heat-conductive and non-conductive materials. A hollow working cavity is arranged inside the main body; a sensor is arranged at one end of the working cavity; the sensor comprises a basal body made of non-heat-conductive and non-conductive materials; a platinum component coated with a catalytic layer is arranged at the end face of the basal body and at the central part of the working cavity; both ends of the platinum component are led out from the other end of the basal body through conductive connecting pieces and are communicated with a measurement control unit; the other end of the basal body is in closed connection with the main body through a seal piece and a cover plate; the central part of the lower part of the working cavity is communicated with a chromatographic column through a connecting tube which is in closed connection with the main body; a waste gas outlet is arranged at the upper part of the working cavity; a gas inlet communicated with a combustion-supporting gas input device is arranged on the flank of the main body, facing the central part of the working cavity. With simple structure, small size, light weight and stable and reliable working, the tester is used in various industries for analyzing organic components (liquid, gas) with certain volatility and inorganic combustible gases.
Description
Technical field
The utility model relates to a kind of detecting device that is used for gas chromatograph, is by the catalytic oxidation to measured object specifically, causes the detecting element resistance change, and obtains corresponding electric signal, thereby measured object is carried out detecting device qualitative, quantitative measurement.
Background technology
Detecting device in the present gas chromatograph both domestic and external is thermal conductance type and ionization type two big classes.Heated filament in the thermal conductance type detecting device is a tungsten filament, because the restriction of tungsten filament length, and it is promptly disconnected to meet oxygen under "on" position, so can not contain oxygen etc. in low, easy burnings of sensitivity thread and the carrier gas is its fatal shortcoming.The former is much higher for the remolding sensitivity of ionization type detecting device, but strong excessively to the analyzing and testing Object Selection, sensing range is narrow.Have the sensing range broad of hydrogen flame ionization type detecting device in this type of detecting device only, but it must use again hydrogen to be combustion gas, do carrier gas with inert gas, and hydrogen belongs to high-risk flammable explosive gas, potential safety hazard is big during use; And ignition operation is cumbersome, is used for realizing that robotization detects almost cannot; The Sheng gas cylinder of a plurality of heavinesses makes it not have advantage portable and field condition work.
The utility model content
The technical problems to be solved in the utility model provides a kind of simple in structure, stable performance, and the detection sensitivity height, analyst coverage is wide, can use air or the inert gas catalytic oxidation heat resistance type gas chromatography detector as carrier gas.
The utility model catalytic oxidation heat resistance type gas chromatography detector comprising the main body of being made cavity body structure by non-heat conduction, conductive material, is provided with the hollow working chamber that one or two horizontal direction is settled in main body, sensor is housed in working chamber; Sensor comprises the body of being made by non-heat conduction, conductive material, body one end face is provided with the platinum assembly of coating Catalytic Layer, and be positioned at the centre of working chamber, outwards draw and the measurement and control unit electric connection from the other end of body by conducting connecting part at platinum assembly two ends, and the other end of body is connected with the main body sealing with cover plate by seal; Working chamber lower central position is communicated with chromatographic column by the connecting pipe that is connected with the main body sealing, and its top is provided with waste gas outlet, in the main body side, is provided with the air intake opening that is communicated with combustion-supporting gas input media over against the working chamber centre.
The utility model catalytic oxidation heat resistance type gas chromatography detector, wherein the platinum assembly is spiral fashion platinum filament or the platinum coating that platinum or platinum alloy material are made, and the continuous conduction length of labyrinth-like is scribed in refinement on coating.
The utility model catalytic oxidation heat resistance type gas chromatography detector, wherein the resistance of platinum assembly is greater than 20 Ω.
The utility model catalytic oxidation heat resistance type gas chromatography detector, wherein measurement and control unit comprises signals collecting and treatment circuit, also comprises the heater circuit to the platinum assembly, making the working temperature in the working chamber is 250 ℃～500 ℃.
The characteristics that the utility model compared with prior art has high-lighting are:
1, detection limit (sensitivity) is lower than 10
-10Gram is much better than thermal conductance type detecting device, near or reach 10 of hydrogen flame ion-type detecting device
-11Gram.
2, the sensor that adopts platinum metal material to make in the detecting device has the catalytic oxidation ability of nonflame heating, and intensity height, also can effectively prolong under the platinum assembly active length prerequisite, keep stability preferably, reduced the dead volume (less than 4 microlitres) of detecting device, this be prior art can't be obtained.
3, both the inorganic gas composition can be detected, also organic component can be detected.Both macro-analysis can be done, also microanalysis can be done.Overcome hydrogen flame ion-type detecting device and can not detect the deficiency that inorganic mechanisms of qi such as hydrogen, carbon monoxide and thermal conductance type detecting device can not be done microanalysis.
4, the air that uses a kind of most convenient to obtain is usually made work source of the gas (also can use nitrogen in case of necessity is single work source of the gas), overcoming existing detecting device must use multiple high-purity gas to make carrier gas and work source of the gas, thereby cause the bulky and heavy drawback of total system, the unsafe factor that particularly adopts high-risk hydrogen to bring.
5, this detector arrangement is simple, and volume is little, and is in light weight, and working stability is reliable, both has been suitable as conventional analysis equipment, also can be used for unattended automatic analysis equipment.Therefore it can be used for numerous analyses that certain volatile organic constituents (liquid, gas) and inorganic inflammable gas are arranged, and can be widely used in multiple industry such as chemical industry, oil, combustion gas, electric power, light industry, medicine, food, fire-fighting, environmental protection, teaching, public security and tobacco and the department.
Description of drawings
Fig. 1 is the utility model catalytic oxidation heat resistance type gas chromatography detector structure front elevational schematic (part section);
Fig. 2 is the schematic top plan view (left side is a section) of Fig. 1.
Embodiment
By Fig. 1, Fig. 2 as seen, the utility model catalytic oxidation heat resistance type gas chromatography detector comprises the main body 1 of being made cavity body structure by non-heat conduction, conductive material, in main body 1, be provided with the hollow working chamber 2 that two horizontal directions are settled, sensor be housed at the two ends of working chamber 2; Sensor comprises the body of being made by non-heat conduction, conductive material 3, body 3 one end faces are provided with the platinum assembly 4 of coating Catalytic Layer, and be positioned at the centre of working chamber 2, outwards draw and the measurement and control unit electric connection from the other end of body 3 by conducting connecting part at platinum assembly 4 two ends, and the other end of body 3 is connected with main body 1 sealing with cover plate 6 by seal 5.Platinum assembly 4 is spiral fashion platinum filament or the platinum coating that platinum or platinum alloy material are made, and applies Catalytic Layer on the surface of platinum filament or platinum coating; And the continuous conduction length of labyrinth-like is scribed in refinement on platinum coating; The resistance of platinum assembly is greater than 20 Ω.Working chamber 2 lower central positions are communicated with chromatographic column by the connecting pipe 7 that is connected with main body 1 sealing, and its top is provided with waste gas outlet 8, in main body 1 side, is provided with the air intake opening 9 that is communicated with combustion-supporting gas input media over against working chamber 2 centres.Measurement and control unit comprises signals collecting and treatment circuit, also comprises the heater circuit to platinum assembly 4, and making the working temperature in the working chamber 2 is 250 ℃～500 ℃.
Principle of work of the present utility model: detecting device is the critical component of gas chromatograph, in chromatograph, be communicated with the chromatographic column sealing by connecting pipe 7, the chromatographic column front end is communicated with vaporizer, from bottom upwards flows into working chamber with carrier gas through chromatographic column when measured object enters vaporizer.When each component of measured object after chromatographic column is separated, by being heated to the platinum assembly surface of 250 ℃～500 ℃ sensor in the working chamber, violent catalytic oxidation takes place one by one, also be called flameless burning.The burning of different component causes the temperature variation of platinum assembly, thereby cause the variation of platinum electrical component resistance, measurement bridge circuit in the measurement and control unit records the variable signal of resistance value, after processing and amplifying, be the chromatographic peak signal of this each component of measured object, thereby can calculate each components contents in the measured object.
If by the component after the chromatographic column separation is not combustible, when it passes through the platinum assembly surface, also can obtain a corresponding signal, what only at this moment obtain is not the signal that violent catalytic oxidation produces, but cooling signal, also obtain a corresponding chromatographic peak, pass through processing and amplifying equally after, can obtain corresponding quantitative result.
When measured object must use that the chromatographic column of oxytolerant is not separated, can use inert gas (nitrogen, argon gas or helium etc.) as carrier gas, counting air intake opening 9 automatic input airs from main body one side in addition enters in the working chamber 2, finish the catalytic oxidation process of each component in the measured object, can obtain their chromatographic peak signal equally, thereby effectively widen the use object of chromatographic column, make the sensing range of detecting device more extensive.
Claims (4)
1, a kind of catalytic oxidation heat resistance type gas chromatography detector, it is characterized in that it comprises the main body (1) of being made cavity body structure by non-heat conduction, conductive material, in described main body (1), be provided with the hollow working chamber (2) that one or two horizontal direction is settled, in described working chamber (2), sensor be housed; Described sensor comprises the body of being made by non-heat conduction, conductive material (3), described body (3) one end faces are provided with the platinum assembly (4) of coating Catalytic Layer, and be positioned at the centre of described working chamber (2), outwards draw and the measurement and control unit electric connection from the other end of described body (3) by conducting connecting part at described platinum assembly (4) two ends, and the other end of described body (3) is connected with described main body (1) sealing with cover plate (6) by seal (5); Described working chamber (2) lower central position is communicated with chromatographic column by the connecting pipe (7) that is connected with described main body (1) sealing, its top is provided with waste gas outlet (8), in described main body (1) side, be provided with the air intake opening (9) that is communicated with combustion-supporting gas input media over against described working chamber (2) centre.
2,, it is characterized in that spiral fashion platinum filament or platinum coating that described platinum assembly (4) is made for platinum or platinum alloy material, and the continuous conduction length of labyrinth-like is scribed in refinement on platinum coating according to the described catalytic oxidation heat resistance type gas chromatography detector of claim 1.
3, according to the described catalytic oxidation heat resistance type gas chromatography detector of claim 2, the resistance that it is characterized in that described platinum assembly (4) is greater than 20 Ω.
4, according to the described catalytic oxidation heat resistance type gas chromatography detector of claim 3, it is characterized in that described measurement and control unit comprises signals collecting and treatment circuit, also comprise the heater circuit to described platinum assembly (4), making the working temperature in the described working chamber (2) is 250 ℃～500 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201703118U CN201096760Y (en) | 2007-08-21 | 2007-08-21 | Catalyzing and oxidation thermal resistance gas phase color spectrum detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201703118U CN201096760Y (en) | 2007-08-21 | 2007-08-21 | Catalyzing and oxidation thermal resistance gas phase color spectrum detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201096760Y true CN201096760Y (en) | 2008-08-06 |
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ID=39923813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201703118U Expired - Fee Related CN201096760Y (en) | 2007-08-21 | 2007-08-21 | Catalyzing and oxidation thermal resistance gas phase color spectrum detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201096760Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324166A (en) * | 2015-07-03 | 2017-01-11 | 中国科学院大连化学物理研究所 | Gas chromatography detector |
| CN107589182A (en) * | 2016-07-07 | 2018-01-16 | 阿尔法莫斯公司 | Gas chromatograph |
| CN115201386A (en) * | 2022-07-08 | 2022-10-18 | 昆明摩创科技有限公司 | Gas chromatography catalytic combustion ionization and hot wire detection system and method |
-
2007
- 2007-08-21 CN CNU2007201703118U patent/CN201096760Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324166A (en) * | 2015-07-03 | 2017-01-11 | 中国科学院大连化学物理研究所 | Gas chromatography detector |
| CN106324166B (en) * | 2015-07-03 | 2017-11-03 | 中国科学院大连化学物理研究所 | A kind of gas chromatography detector |
| CN107589182A (en) * | 2016-07-07 | 2018-01-16 | 阿尔法莫斯公司 | Gas chromatograph |
| CN115201386A (en) * | 2022-07-08 | 2022-10-18 | 昆明摩创科技有限公司 | Gas chromatography catalytic combustion ionization and hot wire detection system and method |
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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: 20080806 Termination date: 20140821 |
|
| EXPY | Termination of patent right or utility model |