CN2695950Y - Harmful gas sensor - Google Patents
Harmful gas sensor Download PDFInfo
- Publication number
- CN2695950Y CN2695950Y CN 200420040398 CN200420040398U CN2695950Y CN 2695950 Y CN2695950 Y CN 2695950Y CN 200420040398 CN200420040398 CN 200420040398 CN 200420040398 U CN200420040398 U CN 200420040398U CN 2695950 Y CN2695950 Y CN 2695950Y
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- CN
- China
- Prior art keywords
- gas sensor
- microprocessor
- resistance
- control
- module
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The utility model provides a harmful gas sensor, comprising a microprocessor equipped at a crust, a control module, a gas sensor and a data acquisition module, wherein, the microprocessor is with a memorizer and an A/D change-over function. The utility model is characterized in that the control I/O end of the microprocessor is connected with the heating control end of the gas sensor via the control module and the output end of the gas sensor is connected with the microprocessor via the data acquisition module. The apparatus realizes the heating control of the gas sensor by the control module and the resistance connected at the output end of the gas sensor is as a sampling resistance. The output voltage reflects the concentration changes of harmful gas and the output voltage at both ends is delivered into the A/D input foot of the microprocessor to realize data sampling and make luminous indication by an indication module. When the gas concentration exceeds the set concentration, the apparatus issues an alarm signal and has the advantages of simple structure, convenient function and strong practicability, therefore, the apparatus is in particular acceptable for testing and alarming to manhole harmful gas concentration when electric communication branch personnel enters manhole operation.
Description
Affiliated technical field
The utility model provides a kind of harmful gas sensor, belongs to the gas concentration technical field of measurement and test.
Background technology
Toxic and harmful detecting instrument production and selling producer in China is also few in fact at present, and focuses mostly in the detection of inflammable gass such as family expenses coal gas and coal-mine gas, and majority is that fixed pure gas detects.Because the power consumption of harmful gas sensor is bigger, generally be not suitable for making handheld instrument.Though external toxic and harmful detecting instrument is more accurate, but price is higher, a detector price is several ten thousand even tens0000, this has brought difficulty with regard to the popularization of giving instrument, the general in actual applications in fact concentration that does not need to test harmful gas, and that whether the concentration that only need understand harmful gas can work the mischief to human body is just passable, that is to say that to need the instrument that can send alerting signal when harmful gas exceeds standard of a hand-held just enough.And the manufacturer of this instrument is seldom domestic, and it then is blank specially carrying out the instrument that the test of people's well harmful gas reports to the police at telecommunication department.
The utility model content
The purpose of this utility model provides and a kind ofly can overcome above-mentioned defective, simple in structure, multiple functional, cheap harmful gas sensor.Its technical scheme is:
Comprise the microprocessor, control module, gas sensor and the data acquisition module that are arranged in the housing, wherein microprocessor has storer and A/D translation function, it is characterized in that: the control I/O of microprocessor holds the heating control end that connects gas sensor through control module, and the output terminal of gas sensor connects microprocessor through data acquisition module.
Described harmful gas sensor, control module comprises resistance R 4, resistance R 7, resistance R 8 and triode V2, the base stage of a termination triode V2 of resistance R 7 wherein, the other end connects the control I/O end of microprocessor respectively and meets power supply VCC through resistance R 4 as the control end of control module, the grounded emitter of triode V2, collector connects the heating control end of gas sensor, and resistance R 8 is attempted by the two ends of triode V2 collector and emitter.
Resistance and electric capacity that described harmful gas sensor, data acquisition module comprise and connect, the A/D input end of the output terminal of a termination gas sensor of electric capacity and resistance and microprocessor wherein, its other end ground connection.
Described harmful gas sensor, the indicating module of setting up on housing comprises resistance and light emitting diode, wherein the positive pole of light emitting diode connects the control I/O end of microprocessor, the corresponding connecting resistance ground connection of its negative pole.
Described harmful gas sensor, the signal acquisition circuit of being made up of control module, gas sensor and data acquisition module has a plurality of, and wherein the output terminal correspondence of the control end of control module and data acquisition module connects the corresponding I/O pin of microprocessor.Adopt the gas sensor of a plurality of models like this, just can different harmful gas concentrations be detected, and indicate.
Its principle of work is: realized the effect of electronic switch gas sensor having been realized adding heat control by control module.When triode V2 conducting, the voltage that is added in gas sensor A, B two ends is VCC-0.7V, when not conducting of V2, and gas sensor and resistance R 8 dividing potential drops, the voltage at A, B two ends that is added in gas sensor is very little, and gas sensor stops heating.Resistance in the data acquisition module is sampling resistor, its output voltage has reflected the concentration change of harmful gas, its two ends output voltage is delivered to the A/D input pin of microprocessor, realize data sampling, the data of gathering exist in the storer, carry out luminous indication by indicating module, the duty of indication sensor and send the gaseous species of warning.
The utility model compared with prior art, can be by the detection of a plurality of gas sensors realizations to multiple gases concentration be set, measure accurately, cheap, simple in structure, easy to operate, practical, be particularly useful for before the telecommunication department staff enters people's well operations the harmful gas concentration of people's well being tested warning.
Description of drawings
Fig. 1 is the principle of work block diagram of the utility model embodiment;
Fig. 2 is the circuit diagram of the utility model embodiment.
Embodiment
1, housing
Microprocessor U1 adopts the PlC16C712 chip, its 6 pin is successively through K switch 1, the calibration circuit that resistance R 13 is formed meets power supply VCC, gas sensor adopts two, wherein gas sensor U2 adopts the MQ-9 model, be mainly used in and detect CO, CH4 concentration, it is 1 years old, 2,3 pin meet power supply VCC, its heating control end 5 pin correspondences connect the collector of triode V1 and through resistance R 6 ground connection, the grounded emitter of triode V1, its base stage is held 12 pin and resistance R 2 through the control I/O that resistance R 3 meets microprocessor U1 respectively, another termination power VCC of resistance R 2, microprocessor U1 leaves and closes the heat control that adds that has just realized gas sensor U2 by triode V1 like this, when triode V1 conducting, be added in 2 pin of gas sensor U2, the voltage at 5 pin two ends is VCC-0.7V, when not conducting of V1, and gas sensor U2 and resistance R 6 dividing potential drops, be added in 2 pin of gas sensor U2,5 pin two ends voltage very little, gas sensor U2 carries out low pressure heating.Resistance R 5 in the data acquisition module is a sampling resistor, with the output terminal of capacitor C 2 back one termination gas sensor U2 in parallel and A/D input end 18 pin of microprocessor U1, other end ground connection, the output voltage of resistance R 5 has promptly reflected the concentration change of harmful gas, its two ends output voltage is delivered to the A/D input end of microprocessor U1, realizes data sampling; Another gas sensor U3 adopts the MQ-136 model, is mainly used in to detect H
2S concentration, its connected mode and principle of work are with gas sensor U2.Light emitting diode L1～3 are arranged on the housing 1, are used to indicate H
2S, CO and CH
4Whether report to the police, wherein the anodal correspondence of the light emitting diode L1～3 control I/O that meets microprocessor U1, its negative pole correspondence is through resistance R 10～11 ground connection if holding 7 pin, 8 pin, 9 pin.
According to actual conditions, a plurality of signal acquisition circuits of being made up of control module, gas sensor and data acquisition module can also be set, detect more gas concentration.
Claims (5)
1, a kind of harmful gas sensor, comprise the microprocessor, control module, gas sensor and the data acquisition module that are arranged in the housing (1), wherein microprocessor has storer and A/D translation function, it is characterized in that: the control I/O of microprocessor holds the heating control end that connects gas sensor through control module, and the output terminal of gas sensor connects microprocessor through data acquisition module.
2, harmful gas sensor as claimed in claim 1, it is characterized in that: control module comprises resistance R 4, resistance R 7, resistance R 8 and triode V2, the base stage of a termination triode V2 of resistance R 7 wherein, the other end connects the control I/O end of microprocessor respectively and meets power supply VCC through resistance R 4 as the control end of control module, the grounded emitter of triode V2, collector connects the heating control end of gas sensor, and resistance R 8 is attempted by the two ends of triode V2 collector and emitter.
3, harmful gas sensor as claimed in claim 1 is characterized in that: resistance and electric capacity that data acquisition module comprises and connects, the A/D input end of the output terminal of a termination gas sensor of electric capacity and resistance and microprocessor wherein, its other end ground connection.
4, harmful gas sensor as claimed in claim 1, it is characterized in that: the indicating module of setting up on housing comprises resistance and light emitting diode, wherein the positive pole of light emitting diode connects the control I/O end of microprocessor, the corresponding connecting resistance ground connection of its negative pole.
5, harmful gas sensor as claimed in claim 1, it is characterized in that: the signal acquisition circuit of being made up of control module, gas sensor and data acquisition module has a plurality of, and wherein the output terminal correspondence of the control end of control module and data acquisition module connects the corresponding I/O pin of microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420040398 CN2695950Y (en) | 2004-05-15 | 2004-05-15 | Harmful gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420040398 CN2695950Y (en) | 2004-05-15 | 2004-05-15 | Harmful gas sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2695950Y true CN2695950Y (en) | 2005-04-27 |
Family
ID=34774293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420040398 Expired - Fee Related CN2695950Y (en) | 2004-05-15 | 2004-05-15 | Harmful gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2695950Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101609593B (en) * | 2009-07-21 | 2011-01-19 | 中国科学技术大学 | Toxic and harmful gas alarm circuit system with automatic adjustment function |
| CN102116751A (en) * | 2010-12-16 | 2011-07-06 | 北京华科仪电力仪表研究所 | Intelligent combustible/toxic gas sensor |
-
2004
- 2004-05-15 CN CN 200420040398 patent/CN2695950Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101609593B (en) * | 2009-07-21 | 2011-01-19 | 中国科学技术大学 | Toxic and harmful gas alarm circuit system with automatic adjustment function |
| CN102116751A (en) * | 2010-12-16 | 2011-07-06 | 北京华科仪电力仪表研究所 | Intelligent combustible/toxic gas sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050427 Termination date: 20100515 |