MQ Gas Sensor

Other Hardware Sensors
1

Hi everyone,

I get some information from Arduino Playground - MQGasSensors

There are many kinds of sensors in MQ series ( MQ-2, MQ-3, MQ-4, MQ-5, MQ-6, MQ-7, etc. )

but their sensing material all are SnO2 !!!

Why these sensors will be sensitive for particular compound,

what are the differences between these sensors.

Thanks.

2

The Tin_dioxide is doped with other materials to make them most sensible to a certain family of gases.

3

So that's how it is !! Thanks !!

By the way, I want to detect the heavier compound like SVOC,

I don't know which is suitable for me.

can somebody recommend a sensor for me?

4

As I understand this, you want to detect gas from some sort of material? (one sensor VERY close , the other a short distans away from the object)

You have to make a qualified guess of what to find - and select a sensor based on that guess.