N SI G sxd u}w G iaMutn|m s B B W .u@ VC VH RL RH PH Tao Tas RH B. O2 C.FS /R B W ^q [q tq [q [\ W xs @ MQ-2 P F Xq /tV_ A AyG B BJ B J B J B C AC OR DC AC OR DC N 5V 0.1 5V 0.1 i 32[ 10% p 800 @ N -20J ~50J -20J ~70J p 95%Rh 21%( ) @|vVFS pj 2% N 3K[ -30K[ @d (1000ppm isobutene) 200ppm-5000ppm GMJ 300ppm-5000ppm BJ 5000ppm-2000ppm J 300ppm-5000ppm B 100ppm-2000ppm s W @v Rs Pq G(3000/10000) isobutane u@ w .c ~ 1 Ph 2 q 3 qquu 4 [ 5 6 z q G :20J 2J Vc:5V 0.1 :65% 5% Vh:5V 0.1 p 24 p ] (Au) (Pt) ` X TGT 100 h (Ni-Cr) (SUB316) 

7 d 8 y 9 w} (Ni-Cu) q (Ni-Cu) MQ tCPcz MQ-2 cM~p@ B SnO2 Ph A qqM[cPTwbs (c A or B),L AL2O3 A [?Fnu@ A 4 HX MQ-2 F } E.FSu TXF G A 2 [qy C n C 6 uw C G 20J G 65H G 21% @ RL=5K[ RsG bP 0G bbq A P@Uq C C 

4 XF -2 S G 20J A 33%RH C U A 1000ppm B q RsG P 1000ppm Bq A U A C C z C C ] A b 1000ppm A FOn A P@Pq .C F MQ-2 P F G Tq T : 1000ppm BJP A I]w{vT FEATURES Wide detecting scope Fast response and High sensitivity Stable and long life Simple drive circuitLeft Fig. shows the typical sensitivity characteristics of the MQ-2 for several gases. 

In their: Temp: 20? ? Humidity: 65%? O2 concentration 21% RL=5kO Ro: sensor resistance at 1000ppm of H2 in the clean air. Rs:sensor resistance at various concentrations of gases