We offer sell sensor .5a-mp41-, low consumption, heating current within 80ma. 2-, small size, high sensitivity especial for ch4. 3-, long life, high stability. 4-, simple application circuit. 5-, widely used in house gas alarm, car gas alarm, common portable gas alarm, flammable heating water gas alarm, burning equipment gas alarm, and so on. model 5a-mp4sensor type semiconductor gas sensorstandard encapsulation metal captarget gas ch4, nature gas, butanetemperature range usage:1055storage:2075humidity range 95rhdetection range 30010000ppmstandard circuit conditions loop voltage vc 5v24vdcheater voltage vh 5v0.1vdcacload resistance rl adjustable (1k-20k)sensor character under standard test conditions heater resistance rh 8515 (room tem.)heater consumption ph 400mw(vh=5vih 80ma)sensitivity ls(rs) 0.6 rs3000ppmrsairsensitive resistance rs rs=vcvrl1*rlconcentration slope 0.6(r5000ppmr1000ppm ch4)respond time tx 10srevovery time th 30sstandard test conditions temp. Humidity 202655%rhstandard test circuit vh= vc=5v0.1vdc; rl=4.7k1%preheat time 12 hours calculation method of the sensor powerps= vc* vc* rs(rs+ rl)* (rs+ rl)