Smoke and Gas

Question 1

Which gas do MQ-2 detect?

Answer 1

Flammable gas and smoke

Question 2

Which gas do MQ-3/MQ-303A detect?

Answer 2

Alcohol (ethanol)

Question 3

Which gas do MQ-4 detect?

Answer 3

Methane (CH4)

Question 4

Which gas do MQ-7 detect?

Answer 4

Carbon monoxide (CO)

Question 5

Which gas do MQ-8 detect?

Answer 5

Hydrogen

Question 6

Which gas do MQ-9 detect?

Answer 6

Carbon monoxide, methane, LPG (propane/butane)

Question 7

How does MQ-2 operate?

Answer 7

• Reports smoke by voltage level it puts out
• The more smoke the higher the voltage
• It has built in potentiometer to adjust sensitivity