CN203587548U - Automatic test system for gas sensitive element - Google Patents
Automatic test system for gas sensitive element Download PDFInfo
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- CN203587548U CN203587548U CN201320673304.5U CN201320673304U CN203587548U CN 203587548 U CN203587548 U CN 203587548U CN 201320673304 U CN201320673304 U CN 201320673304U CN 203587548 U CN203587548 U CN 203587548U
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Abstract
The utility model discloses an automatic test system for a gas sensitive element. The automatic test system comprises an automatic gas distribution device, a measurement circuit part, software control and a computer which are connected with each other, wherein the automatic gas distribution device comprises a gas sensitive element, a temperature measuring element, a heating element and a mass flow meter; the measurement circuit part comprises temperature measurement, flow control, a measurement circuit and signal collection; the software control comprises conversion of A/D (Analog to Digital) and D/A (Digital to Analog). The automatic test system is simple, stable, strong in signal, quick in response and capable of automatically controlling gas distribution and signal collection of the system.
Description
Technical field
The utility model relates to a kind of Auto-Test System, is specifically related to a kind of gas sensor Auto-Test System.
Background technology
Detect gas particularly volatile organic gas (VOC) in daily production and life, become more and more important, how convenient, fast and accurate detection they be research and the application direction of modern gas sensor.At present, for volatile organic gas, there is different detection methods, mainly contain: utilize the characteristics such as the refractive index of gas to light or light absorption to detect the optical method of gas, this method is more traditional, and it installs complicated, use and maintenance difficulty is large, cost is high; The electrochemical process of using electrode and electrolytic solution to detect gas, is also one of common method of gas detection, and it is widely used, but shortcoming is to be subject to environmental factor restriction more; The electric method that utilizes semiconductor gas sensor to detect is to apply in recent years a kind of maximum methods, develop very rapid, current one of output maximum in the world, most widely used sensor of having become.Compare with other gas detection methods, semiconductor gas sensor is having its unique advantage aspect gas detecting: highly sensitive, fast response time, simple in structure, easy to use, low price etc.In the process of gas sensor test gas, because much VOC gas is all harmful to health, and VOC gas responds rapidly in course of reaction, high volatility, manual measurement error are very large, and the raising of element sensitivity is directly affected.
Summary of the invention
The utility model provides a kind of gas sensor Auto-Test System, and it is simple and direct, stable, signal strong, respond Auto-Test System fast, can the functions such as the distribution of system and signals collecting be realized automatically and being controlled.
Technical solution of the present utility model:
A kind of gas sensor Auto-Test System, comprise interconnective automated gas divider, metering circuit part, software control and computing machine, its special character is: described automated gas divider comprises gas sensor, temperature element, heating element and mass flowmeter; Described metering circuit part comprises temperature survey, flow control, metering circuit and signals collecting; Described software control comprises the conversion of A/D and D/A.
In above-mentioned automated gas divider, carrier gas and gas to be measured are inputted drying chamber by mass flow controller respectively and are fully mixed, and are made into the test chamber in test gas sample input test device.
It is to realize in test chamber that above-mentioned gas detects, and the test gas sample that configures concentration enters the test chamber of relative sealing, and gas sensor is positioned in test chamber, has respectively 4 potential electrode and two heating electrodes on gas sensor;
The working temperature of described gas sensor is measured by K type contact thermocouple sensor.
The utility model has the advantage of: provide simple and direct, stable, signal strong, respond Auto-Test System fast, can the functions such as the distribution of system and signals collecting be realized automatically and being controlled.
Accompanying drawing explanation
Fig. 1 is the utility model catenation principle block diagram.
Embodiment
Referring to Fig. 1, a kind of gas sensor Auto-Test System, comprises interconnective automated gas divider, metering circuit part, and software control and computing machine, automated gas divider comprises gas sensor, temperature element, heating element and mass flowmeter; Described metering circuit part comprises temperature survey, flow control, metering circuit and signals collecting; Described software control comprises the conversion of A/D and D/A.
In automated gas divider, carrier gas and gas to be measured are inputted drying chamber by mass flow controller respectively and are fully mixed, and are made into the test chamber in test gas sample input test device.
It is to realize in test chamber that gas detects, and the test gas sample that configures concentration enters the test chamber of relative sealing, and gas sensor is positioned in test chamber, has respectively 4 potential electrode and two heating electrodes on gas sensor; The working temperature of gas sensor is measured by K type contact thermocouple sensor.
In work, the test gas sample of variable concentrations makes sensitive element surface to gas absorption amount difference, and its resistance value also can cause corresponding variation, metering circuit by Real-time Collection to voltage signal be sent in testing software.The measuring-signal that metering circuit detects is by PCI-83l9 photoelectricity isolation mode incoming interface card input computer-controlled program.In real work, in order to meet the needs of distribution concentration broadness and to guarantee precision, the output of Standard Gases sample is not a road, but is divided into two-way or multichannel, the mass flow controller of respectively hanging oneself is connected with proving installation, realizes respectively the mixing match requirement of gas with various under variable concentrations.Mass rate control, precision is ± 0 .l% F. S(full scale).The mass rate (without temperature pressure compensation) of its employing kapillary heat transfer temperature difference calorimetric principle measurement gas.Sensor is heated to the flow signal recording and send into amplifier, the flow detection voltage after amplification compares with measuring voltage, then removes regulating and controlling valve after difference signal is amplified, and the flow that passage is flow through in closed-loop control makes it to equate with the flow of setting.The flow detection voltage of controller output is directly proportional to the mass rate that flows through passage, and flow detection output voltage is+5 V.The flow control scope of mass flow controller is that 2%～l00%F. S(range ratio is 50:l), flow resolution is 0 .l%F. S.
Claims (3)
1. a gas sensor Auto-Test System, comprises interconnective automated gas divider, metering circuit part, and software control and computing machine, is characterized in that: described automated gas divider comprises gas sensor, temperature element, heating element and mass flowmeter; Described metering circuit part comprises temperature survey, flow control, metering circuit and signals collecting; Described software control comprises the conversion of A/D and D/A.
2. gas sensor Auto-Test System according to claim 1, it is characterized in that: in described automated gas divider, carrier gas and gas to be measured are inputted drying chamber by mass flow controller respectively and fully mixed, be made into the test chamber in test gas sample input test device.
3. according to gas sensor Auto-Test System described in claim 1 or 2, it is characterized in that: it is to realize in test chamber that described gas detects, the test gas sample that configures concentration enters the test chamber of relative sealing, gas sensor is positioned in test chamber, has respectively 4 potential electrode and two heating electrodes on gas sensor; The working temperature of described gas sensor is measured by K type contact thermocouple sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320673304.5U CN203587548U (en) | 2013-10-29 | 2013-10-29 | Automatic test system for gas sensitive element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320673304.5U CN203587548U (en) | 2013-10-29 | 2013-10-29 | Automatic test system for gas sensitive element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203587548U true CN203587548U (en) | 2014-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320673304.5U Expired - Fee Related CN203587548U (en) | 2013-10-29 | 2013-10-29 | Automatic test system for gas sensitive element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203587548U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021777A (en) * | 2015-07-31 | 2015-11-04 | 湖北大学 | Multifunctional gas sensor testing system |
| CN107271704A (en) * | 2015-11-13 | 2017-10-20 | 大连民族大学 | Semiconductor gas sensor test system |
-
2013
- 2013-10-29 CN CN201320673304.5U patent/CN203587548U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021777A (en) * | 2015-07-31 | 2015-11-04 | 湖北大学 | Multifunctional gas sensor testing system |
| CN107271704A (en) * | 2015-11-13 | 2017-10-20 | 大连民族大学 | Semiconductor gas sensor test system |
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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: 20140507 Termination date: 20151029 |
|
| EXPY | Termination of patent right or utility model |