Design of a high precision instrument for combustible gas detection and alarm
Using semiconductor gas sensor MQ 2,design an instrument for flammable gas volume fraction detection and alarm,which is composed of combustible gas sensor,analog/digital conversion circuit,microcontroller,display circuit,acousto optic alarm circuit.MQ 2 sensor converts gas volume fraction to voltage signal,transmit to A/D conversion circuit,signal after conversion is transmitted to STC89C52 MCU for processing,then gas volume fraction is displayed by control display unit,at the same time control and driving alarm circuit to achieve sound and light alarm.Experiments show that gas detection precision of the detection and alarm instrument on isobutane,methane,natural gas and other combustible gas reaches 0.01 ,it has characteristics of stable detection performance,good linearity,simple circuit,low cost,miniaturization,and convenient debugging.