CN204807523U - Thermal conductivity detector - Google Patents
Thermal conductivity detector Download PDFInfo
- Publication number
- CN204807523U CN204807523U CN201520475059.6U CN201520475059U CN204807523U CN 204807523 U CN204807523 U CN 204807523U CN 201520475059 U CN201520475059 U CN 201520475059U CN 204807523 U CN204807523 U CN 204807523U
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- Prior art keywords
- detection cell
- pond
- tracheae
- reference gas
- thermal conductivity
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Abstract
The utility model discloses a thermal conductivity detector, including detecting the pond, be equipped with a detection electrode, the 2nd detection electrode in the measuring pond, a detection electrode with the 2nd detection electrode separates through the air current flow distribution plate mutually, the air current flow distribution plate with detect the equal contactless of inner chamber wall in pond, a side that detects the pond is equipped with reference gas entry, the 2nd reference gas entry, first reference trachea, second reference trachea are connected respectively to reference gas entry, the 2nd reference gas entry, first reference trachea, second reference trachea pass through the switch and selectively connect reference gas input tube, a side that detects the pond still is equipped with and sweeps the gas entry, it sweeps the gas input tube to sweep the gas entry linkage, another side that detects the pond is connected to the chromatographic column through the injector, still be equipped with the drain on the detection pond, the drain is equipped with the atmospheric valve. The utility model discloses can realize the switching control of reference gas input and can realize sweeping in detecting the pond.
Description
Technical field
The utility model belongs to scientific analysis Instrument technology field, is specifically related to a kind of thermal conductivity detector (TCD).
Background technology
Thermal conductivity detector (TCD) examines hot device also known as conductance cell or heated filament, is the most frequently used a kind of detecting device of vapor-phase chromatography.The principle of different thermal conductivities is had and the thermal conductivity detector worked based on different component and carrier gas.Sensitive element is heated filament, as tungsten filament, platinum filament, rhenium silk, and forms electric bridge by heated filament.
After passing through steady current, tungsten filament temperature raises, and tungsten filament temperature raises, and its heat is passed to pool wall through the carrier gas molecules of surrounding.When tested component enters conductance cell together with carrier gas, because the thermal conductivity of combination gas is different from pure carrier gas, normally lower than the thermal conductivity of carrier gas, the heat that tungsten filament is transmitted to pool wall also changes, tungsten filament temperature is caused to change, its resistance also changes thereupon, and then makes bridge output produce uneven current potential and export as signal.Thermal conductivity detector (TCD) occurs the earliest and most widely used detecting device in gas chromatography.
In recent years, although in many aspects it replace by the various detecting devices of sensitiveer more specificity, due to it, to have structure simple, stable performance, sensitivity is suitable for, and the range of linearity is wide, there is response to the various material making chromatogram, the most applicablely do microanalysis (ppm level).
Analytical test in, thermal conductivity detector (TCD) not only for analyzing organic contaminant, and for analyzing the inorganic gas that some cannot detect with other detecting devices, as hydrogen, oxygen, nitrogen, carbon monoxide, carbon dioxide etc.
But current detecting device is generally only be provided with a carrier gas inlet, carrier gas outlet, is inconvenient to use, and is inconvenient to the pool wall realized detecting device inside and clears up.
Utility model content
The purpose of this utility model is solve above-mentioned technical matters and provide a kind of convenient thermal conductivity detector (TCD) switching reference gas input.
For realizing the purpose of this utility model, the utility model provides a kind of thermal conductivity detector (TCD), comprise detection cell, the first detecting electrode, the second detecting electrode is provided with in described detection cell, described first detecting electrode and described second detecting electrode are separated by air splitter plate, described air splitter plate does not all contact with the internal chamber wall of described detection cell, and a side of described detection cell is provided with the first reference gas inlet, the second reference gas inlet; Described first reference gas inlet, the second reference gas inlet connect the first reference tracheae, the second reference tracheae respectively, described first reference tracheae, the second reference tracheae selectively connect reference gas input pipe by switch, one side of described detection cell is also provided with sweep gas entrance, described sweep gas entrance connects sweep gas input pipe, and another side of described detection cell is connected to chromatographic column by injector; Described detection cell is also provided with drain, and described drain is provided with atmospheric valve.
Described air splitter plate is placed in the inner chamber medium position of described detection cell.
Described switch is an elastic tube, and one end of described elastic tube is selected a selection with described reference gas input pipe, the other end with described first reference tracheae, the second reference tracheae and is connected.
The utility model compared with prior art, by being provided with the first detecting electrode, the second detecting electrode in detection cell, described first detecting electrode and described second detecting electrode are separated by air splitter plate, described air splitter plate does not all contact with the internal chamber wall of described detection cell, and a side of described detection cell is provided with the first reference gas inlet, the second reference gas inlet; Described first reference gas inlet, the second reference gas inlet connect the first reference tracheae, the second reference tracheae respectively, described first reference tracheae, the second reference tracheae selectively connect reference gas input pipe by switch, one side of described detection cell is also provided with sweep gas entrance, described sweep gas entrance connects sweep gas input pipe, and another side of described detection cell is connected to chromatographic column by injector; Described detection cell is also provided with drain, described drain is provided with atmospheric valve, the switching that can realize the input of reference gas controls and passes through to purge the setting of gas port, can realize purging in detection cell, solves the problem that existing detecting device can not realize purging function and switching reference gas.
Accompanying drawing explanation
The structural representation of the thermal conductivity detector (TCD) that Fig. 1 provides for the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and beneficial effect clearly understand, below in conjunction with embodiment, the utility model is further elaborated.Should be understood to specific embodiment described herein only in order to explain the utility model, be not limited to protection domain of the present utility model.
As shown in Figure 1, the utility model provides a kind of thermal conductivity detector (TCD), comprise detection cell, the first detecting electrode 2, second detecting electrode 3 is provided with in described detection cell 1, described first detecting electrode and described second detecting electrode are separated by air splitter plate 4, described air splitter plate does not all contact with the internal chamber wall of described detection cell, and a side of described detection cell is provided with the first reference gas inlet, the second reference gas inlet; Described first reference gas inlet, the second reference gas inlet connect the first reference tracheae 5, second reference tracheae 6 respectively, described first reference tracheae, the second reference tracheae selectively connect reference gas input pipe 8 by switch 7, one side of described detection cell is also provided with sweep gas entrance, described sweep gas entrance connects sweep gas input pipe 9, and another side of described detection cell is connected to chromatographic column 11 by injector 10; Described detection cell is also provided with drain (not shown), and described drain is provided with atmospheric valve.
Wherein, in specific implementation, described air splitter plate is placed in the inner chamber medium position of described detection cell.
In specific implementation, described switch is an elastic tube, and one end of described elastic tube is selected a selection with described reference gas input pipe, the other end with described first reference tracheae, the second reference tracheae and is connected.
Described elastic tube can be connected by threaded connector with described reference gas input pipe, also the mode of socket can be adopted to connect, described elastic tube can be directly be socketed with described first reference tracheae, the second reference tracheae, or the mode adopting threaded connector to be connected realizes connecting realization switching control.
The utility model compared with prior art, by being provided with the first detecting electrode, the second detecting electrode in detection cell, described first detecting electrode and described second detecting electrode are separated by air splitter plate, described air splitter plate does not all contact with the internal chamber wall of described detection cell, and a side of described detection cell is provided with the first reference gas inlet, the second reference gas inlet; Described first reference gas inlet, the second reference gas inlet connect the first reference tracheae, the second reference tracheae respectively, described first reference tracheae, the second reference tracheae selectively connect reference gas input pipe by switch, one side of described detection cell is also provided with sweep gas entrance, described sweep gas entrance connects sweep gas input pipe, and another side of described detection cell is connected to chromatographic column by injector; Described detection cell is also provided with drain, described drain is provided with atmospheric valve, the switching that can realize the input of reference gas controls and passes through to purge the setting of gas port, can realize purging in detection cell, solves the problem that existing detecting device can not realize purging function and switching reference gas.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (3)
1. a thermal conductivity detector (TCD), it is characterized in that, comprise detection cell, the first detecting electrode, the second detecting electrode is provided with in described detection cell, described first detecting electrode and described second detecting electrode are separated by air splitter plate, described air splitter plate does not all contact with the internal chamber wall of described detection cell, and a side of described detection cell is provided with the first reference gas inlet, the second reference gas inlet; Described first reference gas inlet, the second reference gas inlet connect the first reference tracheae, the second reference tracheae respectively, described first reference tracheae, the second reference tracheae selectively connect reference gas input pipe by switch, one side of described detection cell is also provided with sweep gas entrance, described sweep gas entrance connects sweep gas input pipe, and another side of described detection cell is connected to chromatographic column by injector; Described detection cell is also provided with drain, and described drain is provided with atmospheric valve.
2. thermal conductivity detector (TCD) according to claim 1, it is characterized in that, described air splitter plate is placed in the inner chamber medium position of described detection cell.
3. thermal conductivity detector (TCD) according to claim 1, it is characterized in that, described switch is an elastic tube, and one end of described elastic tube is selected a selection with described reference gas input pipe, the other end with described first reference tracheae, the second reference tracheae and is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520475059.6U CN204807523U (en) | 2015-06-29 | 2015-06-29 | Thermal conductivity detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520475059.6U CN204807523U (en) | 2015-06-29 | 2015-06-29 | Thermal conductivity detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204807523U true CN204807523U (en) | 2015-11-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520475059.6U Expired - Fee Related CN204807523U (en) | 2015-06-29 | 2015-06-29 | Thermal conductivity detector |
Country Status (1)
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| CN (1) | CN204807523U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112378954A (en) * | 2020-12-10 | 2021-02-19 | 江阴金属材料创新研究院有限公司 | Online circulating hydrogen analysis detector |
-
2015
- 2015-06-29 CN CN201520475059.6U patent/CN204807523U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112378954A (en) * | 2020-12-10 | 2021-02-19 | 江阴金属材料创新研究院有限公司 | Online circulating hydrogen analysis detector |
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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: 20151125 Termination date: 20190629 |
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| CF01 | Termination of patent right due to non-payment of annual fee |