The Research And Design Of Detecting And Alarming System For Combustible Gas

In recent years, combustible gases have already obtained widespread application as clean energy sources. This has played an enormous role in improving the life quality of residents. However, once gas let out will not merely cause the environmental pollution, even will cause the emergence of poisonning, exploding, death by accident. So, detecting and alarming system for combustible gas has already become a hot research subject of the safe precaution field. This article is designed just about this subject.Firstly, the article discussess the technological current situation and the development tendency of gas detecting and alarming system, pointing out the research meaning of this subject, studying mainly on the principle of combustible gas survey, RS-485 bus technology, design method of semiconductor type gas detector and configuration of detecting and alarming system, etc.Secondly, the paper puts forward the overall design plan of system for flammable gas, structures the systematic model, explains the composition structure and operation principle of the model, and explains in detail the hardware and software realization of each module.Thirdly, on the foundation of research and analysis on performance characteristics and a large number of experimental datas of the semiconductor type gas sensor, set up the mathematics model of temperature and humidity compensation on gas sensor, develop implementation method of software compensation. This method can realize wider temperature range compensation. Compared with the way of hardware compensation, it is more flexible and has good effects and low costs.Fourthly, analyse such factors influencing the warning dependability of system as environmental, impurity gas interfering, the components and parts generating heat, and provide the corresponding anti-interference measures in the software and hardware.Finally, carry on experiments to the system, educe the test datas in such key characteristics as sensitivity characteristic, temperature and humidity characteristic, long-term stability, etc., and analyse the result.The flammable gas detecting and alarming system designed in this paper can effectively monitor gas leakage in surroundings and guard against the accidents caused by gas leakage. It has such advantages as high reliability, big capacity, flexible group's network.