家用小型甲烷浓度监测报警装置的设计

Design of small methane concentration monitoring home alarm device

由于煤气、天然气泄漏、爆炸造成的事故时有发生,极大威胁着人民的生命和财产安全。为了避免类似灾难的发生,设计了一种以气敏传感器为主要元件的小型便携式甲烷浓度监测报警装置电路。采用TGS813气敏传感器,利用在不同气体浓度中传感器有不同的导电率这一特性,将传感器与负载串联,气体浓度变化即引起负载电压变化,读取这一变化电压,经比较、放大后实现报警功能。该设计电路简单,成本低廉,操作方便,适合家庭安装使用。

Gas and natural gas leak and explosion accidents have occurred to be a great threat to peoples′ lives and property.In order to avoid similar disasters,a small portable alarm circuit is designed,which uses gas sensors as the main component to monitor the methane concentration.The device uses gas sensor named TGS813 series-connecting with the load.As the sensor has a property of showing different conductivities in different gas concentrations,the change of gas concentration could therefore cause the change of the load voltage.The device achieves the alarm function by reading,comparing and amplifying the change of the voltage.This design of the circuit is simple,low cost and easy to operate for home use.