The MQ-2 is a tin dioxide (SnO₂)–based semiconductor gas sensor designed for the detection of flammable gases and smoke. It is widely used in gas leakage detectors, fire alarms, and air quality monitoring systems.
Function: Gas Sensor
Package: Module Type
Manufacturer: Unspecified
Image
Description
They are used in gas leakagedetecting equipments in family and industry, are suitable for detecting of LPG, i-butane, propane, methane,alcohol, Hydrogen, smoke.
Sensitive material of MQ-2 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist, The sensor’s conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration.
Image and Pinouts:
Electrical Characteristics
| Parameter | Typical Value |
|---|---|
| Operating Voltage | 5 V |
| Heater Voltage (VH) | 5 V ± 0.2 V |
| Heater Resistance | ~33 Ω |
| Heater Power | ≈ 900 mW |
| Load Resistance (RL) | 4.7 kΩ – 47 kΩ |
| Detecting Range | 300 ppm – 10,000 ppm (combustible gases/smoke) |
| Preheat Time | > 24 h (first use), a few minutes after |
Features
1. Sensitive for LPG, propane, hydrogen
2. Output voltage boosts along with the concentration of the measured gases increases
3. Fast response and recovery
4. Features boost circuit
5. Adjustable sensitivity
6. Signal output indicator
7. Wide detecting scope
8. Fast response and High sensitivity
9. Stable and long life
10. Simple drive circuit
Comparison Table
| Feature / Sensor | MQ-2 | MQ-6 |
|---|---|---|
| Main target gases | LPG, methane, butane, hydrogen, alcohol, smoke | LPG, butane, propane |
| Detection range | 300 – 10,000 ppm | 300 – 10,000 ppm |
| Sensitivity characteristics | Broad sensitivity to multiple gases and smoke | Narrow, selective sensitivity (focused on LPG/propane) |
| Best applications | Fire detection, gas leakage alarms, broad air quality monitoring | LPG leak detectors, propane storage safety, kitchen/camping gas monitors |
| Cross-sensitivity | High (responds to many gases, less selective) | Lower (more selective to LPG/propane) |
| Accuracy for specific gas | Lower, requires calibration | Higher for LPG/propane detection |
Applications:
1. Gas leakage detector
Reference Site: https://wiki.seeedstudio.com/Grove-Gas_Sensor-MQ2/
Other data sheets are available within the file: MQ2
MQ-2 Datasheet PDF Download
