可燃气体报警器电路设计摘 要随着可燃性气体种类和应用围的增加，其使用场所和贮气仓库气体的泄漏、火灾爆炸事故日益增多，因此研制一种检测可燃性气体自动报警和自动打开排气装置的一种报警器是非常必要的。本次设计的可燃气体报警器电路，可以检测多种可燃性气体并对其进行报警，在本设计中选用了气敏传感器 GS-A2，利用 GS-A2 检测可燃气体的浓度，当浓度达到报警临界值时进行声光报警。气体信号检测部分主要由传感器 GS-A2 和分压电阻构成，然后通过运算放大器构成的滞回比较电路和反向比例运算电路输出控制信号。由于气敏传感器 GS-A2 开始通电时会有一段时间阻值很小，为了防止其发生误报警，检测电路需配合延时电路才能保证其准确性。控制信号通过报警电路实现声光报警与控制机外排风设备等联动装置，从而实现可燃气体报警器的电路设计。关键词：报警器；GS-A2；误报警；控制信号 The Circuit Design of Flammable Gas Alarm ApparatusABSTRACTWith the increase of combustible gas types and application scope, the use place of gas leakage, fire and gas storage warehouse explosion accidents are increasing, so develop an automatic detecting combustible gas alarm and automatically open the exhaust device of an alarm system is very necessary. The design of the flammable gas alarm circuit can detect a variety of flammable gas and alarm it. In this design chose gas sensor GS - A2, using GS - A2 testing the concentration of the combustible gas, to sound and light alarm when the concentration reaches a critical value. The gas sensor signal detecting section mainly consisted by GS-A2 and the voltage dividing resistors, and output a control signal through the hysteretic comparator circuit constituted by operational amplifier and reverse proportional arithmetic circuit. Since gas sensor GS-A2 starts when power is minimal resistance for some time, in order to prevent false alarms, the detection circuit must comply with in order to ensure its accuracy delay circuit....
