MQ sensors are physicochemical sensors for detecting a wide variety of gases, pollutants and fumes in the atmosphere . This table lists the main technical information and refers to the technical documentation as well as the calibration instructions found on the internet.
Warning. The sensor heats up after a few minutes of use. This is normal, it is the very principle of operation of all physicochemical sensors. Take this into account when designing your project.
| Sensor | Sensitive to | Preheating * | Technical documentation | Calibration | Example |
| MQ-2 | Methane, Butane, LPG and fumes | 48h | Read | Read | |
| MQ-3 | Alcohol, Ethanol and fumes | 24h | Read | Read the article of nootropicdesign (English) | |
| MQ-4 | Methane (CH4). From 300 to 10,000 ppm | 48h | Read | ||
| MQ-5 | Natural gas, LPG. From 300 to 50,000 ppm. Response time less than 10s | 24h | Read | ||
| MQ-6 | LPG, butane. From 200 to 10,000 ppm | 48 | Read | ||
| MQ-7 | Carbon monoxide (CO). From 20 to 2000 ppm | 48h | Read | ||
| MQ-8 | Hydrogen. From 100 to 10,000 ppm | 24h | Read | ||
| MQ-9 | Carbon monoxide, methane (CH4) | Read | Read the seeedstudio article | ||
| MQ131 | Ozone | Read | |||
| MQ135 | Air quality | 24h | Read | Read | |
| MQ136 | Gaseous hydrogen sulfide (H2S). From 1 to 1000 ppm | 24h | Read | ||
| MQ137 | Ammonia. From 5 to 500ppm | Read | |||
| MQ138 | Benzene, Toluene, Alcohol, Acetone, Propane, Formaldehyde, Hydrogen. From 10 to 1000ppm except for NH3, from 10 to 3000 ppm | 24h | Read | ||
| MQ214 | Methane (from 3000ppm to 20000ppm), LPG and propane (500ppm to 10000ppm, butane (500ppm to 10000ppm) | 24h | Read | ||
| MQ216 | Natural gas, coal gas, Propane, CH4 | 24h | Read | ||
| MQ303A | Alcohol, Ethanol, fumes | + 48h | Read | Read | |
| MQ306A | LPG, butane
Same as MQ-6 but with lower heating voltage (0.9V) |
+ 48h | Read | ||
| MQ307A | Carbon monoxide (CO)
Identical to MQ-7 but with a voltage varying from 0.2 to 0.9V |
+ 48h | Read | ||
| MQ309A | Carbon monoxide, flammable gases
Identical to MQ-9 but with a voltage varying from 0.2 to 0.9V |
+ 48h | Read |
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