CN1094514A - Gas sampling and testing instrument - Google Patents
Gas sampling and testing instrument Download PDFInfo
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- CN1094514A CN1094514A CN 93104864 CN93104864A CN1094514A CN 1094514 A CN1094514 A CN 1094514A CN 93104864 CN93104864 CN 93104864 CN 93104864 A CN93104864 A CN 93104864A CN 1094514 A CN1094514 A CN 1094514A
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Abstract
Gas sampling and testing instrument by test probe respectively with power supply, temperature control equipment, test shows and the time is controlled and links to each other, said time control shows with test and links to each other, said test demonstration links to each other with temperature control, and said temperature control links to each other with power supply, constitutes a test macro.The present invention is simple in structure, and test accurately carries out gas sampling and test simultaneously, is widely used in environment and health and epidemic prevention department and carries out the on-the-spot detection of harmful gas in real time.
Description
The invention belongs to aspects such as environmental monitoring, health and epidemic prevention and carry out gas sampling test.
At present for air environmental pollution mainly from air content of harmful gas such as sulphuric dioxide, chlorine dioxide, ozone and carbon dioxide whether be above standard and judge.The method of monitoring mainly is to adopt the gas spot sampling, and the laboratory is with traditional species analysis method, as spectrophotometric method, and infra-red sepectrometry, means such as galvanochemistry are carried out analyzing and testing.Though analytical approach itself is very accurate, because intermediate link is many, have influence on the accuracy of test, and method is time-consuming, require great effort, more can not accomplish on-the-spot detection in real time.
Purpose of the present invention is exactly the deficiency that will overcome existing method, utilizes the gas with various sensor sensitive is carried out the detection of gas concentration, accomplishes gas sampling and tests and can carry out simultaneously, can on-the-spotly detect in real time.Principal feature of the present invention is that test probe links to each other with power supply, temperature control equipment, test demonstration and time control respectively, said time control shows with test and links to each other, said test demonstration links to each other with temperature control, and said temperature control links to each other with power supply, constitutes a side test system.
The present invention is simple in structure, and test accurately carries out gas sampling and test simultaneously, and the departments such as environment, health and epidemic prevention that are widely used in carry out the on-the-spot detection of harmful gas in real time.
Fig. 1 is sampling tester structured flowchart.
Fig. 2 is the test probe structure.
Vacuum pump (1), air chamber (2), solenoid valve (3), gas sensor (4), temperature sensor (5), heating source (6), air intake opening (7).
The present invention is described in detail below in detail: because gas sensor generally is the surface action type, be that gas absorption is on the surface of sensitive material, the electricity that causes is led the concentration that changes with gas certain relation, and the electricity of sensitive material leads to change with gas absorption has relation in its surperficial adsorbance.Quantitative according to HENRY:
Γ＝Γtbp （1）
Wherein Γ is the adsorbance of gas, and Γ t is the concentration of gas at absorption position, and P is the pressure of gas, and b is an absorption constant and the ratio of desorption constant.As everyone knows, absorption constant is relevant with desorption constant and temperature, as seen, in the measurement environment of reality, make variation that sensor electrical leads and gas concentration accurate corresponding be unusual difficulty.In addition, for the NO that utilizes the preparation of CuPc organic semiconductor sensitive material
2Gas sensor, the intrinsic electricity of sensitive material lead to change with temperature following relation
σ＝σoexp（-E/2KT） （2）
σ is a surface conductivity in the formula, and σ o is a constant, and E is an energy of activation, and k is the Boltzmann constant, and T is a temperature.Because the intrinsic electricity of temperature effect sensitive material is led, thereby has influence on the sensitivity of sensitive chip to gas, this is make that gas sensor accurately measures one a very important problem.
The present invention is intended to reduce to greatest extent the influence of environmental factor to accurate measurement.Its course of work is as follows, opens vacuum pump (1), the air chamber of finding time (2), close vacuum pump, open solenoid valve (3), make environmental gas to be measured enter air chamber automatically, close air chamber to get rid of the influence of variations in flow, obtain a constant compression force like this gas absorption amount.Airtight air chamber makes again and obtains a stationary temperature easily by the temperature control unit of being made up of temperature probe (5) and heating source (6), therefore, got rid of the influence that temperature is led etc. absorption constant and sensitive material intrinsic electricity again.NO
2Gas sensor (4) transfers gas signal to electric signal after to the gas test in the air chamber, and its result shows on display.Utilize this device can create the test environment of a constant temperature and pressure, by to test procedure: the valve of finding time → open → test → find time → ..., carry out time control and form normalized method of testing, can improve the accuracy of gas sensor to greatest extent.Therefore such device can be used for department such as environmental health epidemic prevention and carries out the on-the-spot detection of harmful gas in real time.
Claims (3)
1, gas sampling and testing instrument have that probe, power supply, temperature control equipment, test show, time control it is characterized by test probe respectively with power supply, temperature control equipment, test shows with time control and links to each other, said time control shows with test and links to each other, said test demonstration links to each other with temperature control, and said temperature control links to each other with power supply; Constitute a test macro.
2, it is characterized by said test probe by the described tester of claim 1 is linked to each other with air intake opening (7) with solenoid valve (3) by air chamber (2) one ends, the other end links to each other with vacuum pump (1), in air chamber (2), be placed with gas sensor (4), temperature probe (5) and heating source (6).
3, it is characterized by gas sensor by claim 1 or 2 described testers is NO
2Sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93104864 CN1094514A (en) | 1993-04-29 | 1993-04-29 | Gas sampling and testing instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93104864 CN1094514A (en) | 1993-04-29 | 1993-04-29 | Gas sampling and testing instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1094514A true CN1094514A (en) | 1994-11-02 |
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ID=4985420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93104864 Pending CN1094514A (en) | 1993-04-29 | 1993-04-29 | Gas sampling and testing instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1094514A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101819195A (en) * | 2010-04-09 | 2010-09-01 | 成都兴邦泰实业有限责任公司 | Centralized room gas detection system |
| CN101241093B (en) * | 2007-02-07 | 2011-01-05 | 中国科学院微电子研究所 | Gas sensor calibration and reliability test system |
| CN106442640A (en) * | 2015-08-06 | 2017-02-22 | 宏达国际电子股份有限公司 | Gas detection apparatus and gas detection method using gas detection apparatus |
| CN106680417A (en) * | 2016-12-29 | 2017-05-17 | 湖北锐意自控系统有限公司 | Device and method for rapidly detecting ash content and heat value of coal |
| US10520490B2 (en) | 2015-08-06 | 2019-12-31 | Htc Corporation | Gas detecting device and gas detecting method using the same |
-
1993
- 1993-04-29 CN CN 93104864 patent/CN1094514A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101241093B (en) * | 2007-02-07 | 2011-01-05 | 中国科学院微电子研究所 | Gas sensor calibration and reliability test system |
| CN101819195A (en) * | 2010-04-09 | 2010-09-01 | 成都兴邦泰实业有限责任公司 | Centralized room gas detection system |
| CN106442640A (en) * | 2015-08-06 | 2017-02-22 | 宏达国际电子股份有限公司 | Gas detection apparatus and gas detection method using gas detection apparatus |
| US10520490B2 (en) | 2015-08-06 | 2019-12-31 | Htc Corporation | Gas detecting device and gas detecting method using the same |
| CN106680417A (en) * | 2016-12-29 | 2017-05-17 | 湖北锐意自控系统有限公司 | Device and method for rapidly detecting ash content and heat value of coal |
| CN106680417B (en) * | 2016-12-29 | 2019-05-24 | 湖北锐意自控系统有限公司 | A kind of device and method of quick detection coal quality ash content and calorific value |
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