MQ Air Quality Gas Sensor Module [Rectangular PCB]

$1.00 $1.99

MQ-2
MQ-3
MQ-4
MQ-5
MQ-7
MQ-8
MQ-9
MQ-135

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Air Quality Monitoring Alcohol Detection Ammonia Detection Arduino Gas Sensor Projects CO Detection CO2 Detection DIY Gas Sensor Projects Electronic Nose Gas Detection Technology Gas Sensor Applications Gas Sensor Module Tutorials Home Automation Gas Sensors Hydrogen Detection LPG Detection Methane Detection MQ Sensor Calibration MQ Sensor Integration MQ Series Gas Sensors MQ135 Gas Sensor MQ2 Gas Sensor MQ3 Gas Sensor MQ4 Gas Sensor MQ5 Gas Sensor MQ6 Gas Sensor MQ7 Gas Sensor MQ8 Gas Sensor MQ9 Gas Sensor Raspberry Pi Gas Sensor Projects Sensor Module Datasheets Smoke Detection

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Environmental & Gas Sensors

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MQ Series Gas Sensor Detector Modules for DIY (MQ 2/3/4/5/6/7/8/9/135)

MQ Series gas sensors are a popular and cost-effective range of electrochemical sensors. They are designed to detect various gases and are widely used in air quality monitoring, industrial safety, and leak detection. Below is a detailed overview of each sensor in the series and the specific gas it detects:

Sensor	Target Gas	Other Sensitive Gases
MQ-2	LPG, Smoke, H2	Methane, Butane, CO
MQ-3	Alcohol (Ethanol)	Methane, Benzene, Hexane
MQ-4	Methane	CNG
MQ-5	LPG	Propane, Butane
MQ-6	LPG, Butane	Propane
MQ-7	Carbon Monoxide (CO)	-
MQ-8	Hydrogen (H2)	-
MQ-9	Smoke	CO, Methane, LPG
MQ-135	Ammonia (NH3), Benzene, Alcohol, Smoke	CO2

While these sensors are versatile and useful, they do have some limitations:

Sensitivity: They can detect other gases besides their target gas, which might lead to false alarms.
Accuracy: Their readings can be affected by humidity and temperature changes.
Long-term Stability: Over time, their sensitivity can drift, necessitating periodic calibration.