CN204649672U - A kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor - Google Patents
A kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor Download PDFInfo
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- CN204649672U CN204649672U CN201520174709.3U CN201520174709U CN204649672U CN 204649672 U CN204649672 U CN 204649672U CN 201520174709 U CN201520174709 U CN 201520174709U CN 204649672 U CN204649672 U CN 204649672U
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Abstract
The utility model provides a kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor, comprise conductance cell detecting unit, signal processing unit, storage unit, keyboard, constant current source, temperature acquisition and A/D converting unit, micro-control unit and liquid crystal display, conductance cell detecting unit connection signal processing unit, signal processing unit connects temperature acquisition and A/D converting unit, constant current source connects conductance cell detecting unit, storage unit is connected micro-control unit respectively with keyboard, temperature acquisition is connected micro-control unit with A/D converting unit, micro-control unit connects liquid crystal display, the utility model is reasonable in design, easy to use, measuring speed is fast, measuring accuracy is high, signal to noise ratio (S/N ratio) is high, there is good application prospect.
Description
Technical field
The utility model is specifically related to a kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor.
Background technology
Thermal conductivity sensor belongs to physical property gas sensor, mainly for detection of the volume fraction of the gases such as hydrogen, nitrogen, argon gas and sulphuric dioxide in mixed gas.There is the problems such as detection sensitivity is low, zero point drift is large, ambient temperature compensation is difficult in traditional thermal conductivity cell detector.
Utility model content
The purpose of this utility model is for solving above-mentioned deficiency, provides a kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor.
The purpose of this utility model is achieved through the following technical solutions:
A kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor, comprise conductance cell detecting unit, signal processing unit, storage unit, keyboard, constant current source, temperature acquisition and A/D converting unit, micro-control unit and liquid crystal display, conductance cell detecting unit connection signal processing unit, signal processing unit connects temperature acquisition and A/D converting unit, constant current source connects conductance cell detecting unit, storage unit is connected micro-control unit respectively with keyboard, temperature acquisition is connected micro-control unit with A/D converting unit, and micro-control unit connects liquid crystal display.
The utility model also has some technical characteristics like this:
Micro-control unit adopts P89V51DDR2 singlechip chip.
Temperature acquisition and A/D converting unit adopt AD590 ic temperature transducer and ADS1110 modulus conversion chip.
Signal processing unit comprises precise rectification circuit and low-pass filter circuit.
The input voltage of precise rectification circuit makes the clean input voltage of integrated transporting discharging produce very small change, changes the duty of diode, thus arrives the object of precision rectifying.
The utility model has effect useful as follows:
The utility model is reasonable in design, easy to use, and measuring speed is fast, measuring accuracy is high, signal to noise ratio (S/N ratio) is high, has good application prospect.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present utility model;
Fig. 2 is conductance cell testing circuit of the present utility model;
Fig. 3 is constant-current source circuit figure of the present utility model;
Fig. 4 is temperature acquisition of the present utility model and A/D change-over circuit;
Fig. 5 is precise rectification circuit of the present utility model;
Fig. 6 is low-pass filter circuit of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described:
As shown in Figure 1, a kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor, comprise conductance cell detecting unit 1, signal processing unit 2, storage unit 3, keyboard 4, constant current source 5, temperature acquisition and A/D converting unit 6, micro-control unit 7 and liquid crystal display 8, conductance cell detecting unit 1 connection signal processing unit 2, signal processing unit 2 connects temperature acquisition and A/D converting unit 6, constant current source 5 connects conductance cell detecting unit 1, storage unit 3 is connected micro-control unit 7 respectively with keyboard 4, temperature acquisition is connected micro-control unit 7 with A/D converting unit 6, micro-control unit 7 connects liquid crystal display 8, micro-control unit adopts P89V51DDR2 singlechip chip, temperature acquisition and A/D converting unit adopt AD590 ic temperature transducer and ADS1110 modulus conversion chip, signal processing unit comprises precise rectification circuit and low-pass filter circuit, the input voltage of precise rectification circuit makes the clean input voltage of integrated transporting discharging produce very small change, change the duty of diode, thus arrive the object of precision rectifying.
Form Wheatstone bridge by 4 rhenium tungsten filaments in conductance cell, adopt current constant mode to power, rhenium tungsten filament R1, R4 is reference wall, and rhenium tungsten filament R2, R3 are gage beam, R1, R4 exist together with reference gas, and resistance is identical, R2, R3 is in together in tested gas, and resistance is also identical, and the resistance of reference arm remains unchanged always, and the resistance value of gage beam can change according to the volume fraction change of tested gas, thus make the manageable voltage signal of brachium pontis output signal processing circuit.
Claims (5)
1. the high-accuracy survey nitrogen instrument based on thermal conductivity sensor, comprise conductance cell detecting unit, signal processing unit, storage unit, keyboard, constant current source, temperature acquisition and A/D converting unit, micro-control unit and liquid crystal display, it is characterized in that: conductance cell detecting unit connection signal processing unit, signal processing unit connects temperature acquisition and A/D converting unit, constant current source connects conductance cell detecting unit, storage unit is connected micro-control unit respectively with keyboard, temperature acquisition is connected micro-control unit with A/D converting unit, micro-control unit connects liquid crystal display.
2. a kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor as claimed in claim 1, is characterized in that: described micro-control unit adopts P89V51DDR2 singlechip chip.
3. a kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor as claimed in claim 1, is characterized in that: described temperature acquisition and A/D converting unit adopt AD590 ic temperature transducer and ADS1110 modulus conversion chip.
4. a kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor as claimed in claim 1, is characterized in that: described signal processing unit comprises precise rectification circuit and low-pass filter circuit.
5. a kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor as claimed in claim 4, it is characterized in that: the input voltage of described precise rectification circuit makes the clean input voltage of integrated transporting discharging produce very small change, change the duty of diode, thus arrive the object of precision rectifying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520174709.3U CN204649672U (en) | 2015-03-26 | 2015-03-26 | A kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520174709.3U CN204649672U (en) | 2015-03-26 | 2015-03-26 | A kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204649672U true CN204649672U (en) | 2015-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201520174709.3U Expired - Fee Related CN204649672U (en) | 2015-03-26 | 2015-03-26 | A kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN204649672U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557130A (en) * | 2017-09-25 | 2019-04-02 | 中国石油化工股份有限公司 | A kind of measurement and control method for detection gas thermal conductivity |
-
2015
- 2015-03-26 CN CN201520174709.3U patent/CN204649672U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557130A (en) * | 2017-09-25 | 2019-04-02 | 中国石油化工股份有限公司 | A kind of measurement and control method for detection gas thermal conductivity |
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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: 20150916 Termination date: 20160326 |
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| CF01 | Termination of patent right due to non-payment of annual fee |