In a datasheethttp://www.sparkfun.com/datasheets/S...etric/MQ-6.pdf
there is one spcification PRE-HEAT TIME=48hr
how does it matter while designing detector
can anybody plz tell....how can we get constant output across RL
The link didn't work, but it must be this one. http://www.sparkfun.com/products/9405
From a search on "gas sensor preheat time" it seems that after storage this is required to get a correct output, it is not required again if it is in regular use.
Just use the example circuit in the datasheet to preheat.