It is indispensable in many working environments such as oil refinery, chemical plant, oil depot, liquefied gas/gas station, etc.
It is inevitable that combustible gas or liquid vapor will leak. If the leaked combustible gas or liquid
The steam was not found in time, and the gas concentration accumulated continuously, thus reaching a certain explosion limit.
Then there may be serious accidents such as fire or explosion at any time. To protect this man
Meet the safety requirements of flammable and explosive gases in industrial places; And an alarm device
It is of great significance to develop a low-power combustible gas alarm.
It is necessary.
1. combustible gas alarm principle
T GS-8 13 semiconductor ceramic combustible gas sensor and its
PIC 16F877 single chip microcomputer is the control core of the alarm.
TGS-8 13 semiconductor ceramic combustible gas sensor is mainly composed of alkanes.
A broad-spectrum semiconductor sensor with good sensitivity to various combustible gases. Equipment spirit
Moderate sensitivity, good response and recovery characteristics, fast initial recovery characteristics, and long-term stable and heavy work.
It has excellent performance, such as reproducibility, tolerance to ambient atmosphere, temperature and humidity, and high quality and reliability.
Low-cost gas sensors are widely used in various alarm devices.
The tiny signal corresponding to the concentration of combustible gas sent by the sensor is amplified and sent to the microcontroller.
Device, after A/D conversion, concentration comparison, linearization data processing, converted into the corresponding decimal.
When the combustible gas concentration exceeds, the concentration value, actual combustible gas concentration and various states are displayed.
When the set limit value is reached, an audible and visual alarm will be given and the time will be locked.
Because the gas sensor needs to work in a heated state, the higher the temperature, the faster the reaction and the louder the sound.
The faster the response time and recovery time. In order to improve the response time and ensure the accuracy and stability of the sensor
In order to work effectively, the alarm needs to continuously output 5V voltage to the gas sensor. To ensure that it
Reliability, fault monitoring when outputting 5V voltage. When the sensor heats the wire, or
When the cable and sensor are disconnected or in poor contact, a fault alarm will be given.
There are many related documents on the periodical website:
1 Design of combustible gas monitoring alarm based on ADμC8 12 single chip microcomputer Gao Jingwei Modern Electronic Technology 2008/02
2 development of combustible gas alarm based on Ethernet Zhang Junjie sensor world 2007/ 10
3 Analysis of characteristics of ignition source of combustible gas explosion in goaf Liu Zhijian Coal Technology 2007/09
4 design of combustible gas detection and alarm system based on P89LPC935 Pan Xiaoqing Journal of Jiangxi University of Science and Technology 2007/04
5 Experimental Study on Oxygen Concentration of Combustible Gas Explosion in Coal Mine Deng Jun Coal Mine Safety 2007/06
6 Three-dimensional numerical simulation of flammable gas leakage and diffusion near obstacles Meng Zhipeng Chemical Equipment Technology 2007/02
7 Application of combustible gas and toxic gas monitoring system Wang Jian Petrochemical Automation 2006/05
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13 experimenter of combustible gas combustion and detonation Tian gairong teaching instruments and experiments 2005/04
14 determination of minimum oxygen concentration of combustible gas (vapor) Journal of Liu Bin Shijiazhuang Railway Engineering Vocational and Technical College 2004/04
15 determination of critical oxygen concentration of combustible mixed gas12 fu Zhiyuan industrial safety and environmental protection 2004/.
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18 design introduction of automatic start-stop exhaust device for combustible gas alarm Xin Chen electric explosion-proof 2004/0 1
19 numerical simulation of leakage and diffusion of flammable and toxic gases near obstacles Meng zhipeng chemical equipment technology 2004/0 1
20 the use and maintenance of combustible gas detector Wang Xiang oil depot and gas station 2003/0 1
2 1 XP-3 1 1A Use and maintenance of combustible gas detector Zhu Business Technology 2003/0 1
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24 Safe use and detection of combustible gas Yang Xue China Metrology 2003/ 10.
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29 Industrial experiment of combustible gas catalytic gas sensor Journal of Yunnan University in Wu Zhihong (Natural Science Edition) 2002/S 1
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38 Bus Combustible Gas Monitoring System Journal of Wang Huaxiang China Scientific Instruments 200 1/S 1
39 SP- 1 12 Portable Flammable Gas Detection Alarm Device Fire Technology and Product Information 2000/04
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4 1 Application of combustible gas escape index in evaluation of tree species combustibility Wang Dexiang Journal of Southwest Forestry College 1999/03.
42 SP- 1 102 fire protection technology and product information of combustible gas detection probe 1999/08.
43 Flammable gas explosion-proof experiment Ren Youliang Journal of Shangluo Teachers College 1999/02
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45 IR5000 infrared open-circuit combustible gas detection system Zhu Wei Petrochemical Automation 1999/06
Development of 46 combustible gas monitoring alarm instrument! Fushun mailbox 109 PVC 1999/04
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49 New Digital Display Combustible Gas Transmitter Sindeqiang Information Technology 1999/04
Study on dynamic gas distribution technology of 50 ternary combustible mixed gas Wu Xinmin Coal Mine Electromechanical 1999/02