Sensitive material of MQ
-2 gas sensor is SnO
2,
which with lower conductivity in clean air. When the
target combustible gas exist, The
sensor’s conductivity is more hi
gher along with the
gas concentration
rising. Please use simple electroc
ircuit, Convert change of conductivi
ty to correspond output signal of
gas concentration.
MQ-2 gas sensor has high sensit
ity to LPG, Propane and Hydrogen,
also could be used to Methane
and other combustible steam, it is with low
cost and suitable for different application.