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![[Circular PCB] MQ Series Air Gas Quality Sensor Module](http://makerbazar.in/cdn/shop/files/Ha3a5021f498047078272a955853ad59a8.jpg?v=1716462355&width=800)
![[Circular PCB] MQ Series Air Gas Quality Sensor Module](http://makerbazar.in/cdn/shop/files/MQRoundGasSensor1_1.jpg?v=1716462537&width=800)
![[Circular PCB] MQ Series Air Gas Quality Sensor Module](http://makerbazar.in/cdn/shop/files/MQRoundGasSensor1_1024x.jpg?v=1716462328)
![[Circular PCB] MQ Series Air Gas Quality Sensor Module](http://makerbazar.in/cdn/shop/files/Ha3a5021f498047078272a955853ad59a8_1024x.jpg?v=1716462355)
![[Circular PCB] MQ Series Air Gas Quality Sensor Module](http://makerbazar.in/cdn/shop/files/MQRoundGasSensor1_1_1024x.jpg?v=1716462537)
Description
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.