MQ-8
General Description:
A sensitive material MQ-8 Hydrogen Gas Sensor Module H2 Alarm Detection used in clean air low conductivity tin oxide (SnO2). When there is the environment in which the combustible gas sensor, the conductivity sensor with increasing concentration of combustible gases in the air increases.
Working Principle:
A gas sensor can detect the concentration of a specific gas in the air. Depending upon the concentration of the gas, the sensor generates a potential difference by changing the resistance of the sensing element, which can then be measured as the output voltage. MQ-8 hydrogen gas sensor consists of a sensing element which is aluminum-oxide-based ceramic, coated with tin dioxide (SnO2), enclosed in a stainless-steel mesh. In the case of any H2 in the air, the resistivity of the sensing element changes, and the change is measured to get the concentration of the gas present. MQ-8 sensor can detect H2 in the concentration range of 100-1000ppm.
Specifications:
- This sensor operates with 5V DC.
- It detects hydrogen concentration in the air.
- Resistant to smoke, LPG, and alcohol.
- Power consumption of heater is below 800mW.
- The gas detection range is from 100 to 1000ppm.
- Dual signal output (analog and digital).
- Quick response.
- Highly sensitive to hydrogen gas.
Requirements
| S. No. | Component Name | Values |
|---|---|---|
| 1 | LM393 (Voltage Comparator) IC | |
| 2 | MQ-8 Gas Sensor | |
| 3 | Resistors | 472 |
| 4 | Capacitors | 106, 104, 105 |
| 5 | Male connectors | 4 |
| 6 | Variable potentiometer | 10k |
| 7 | LED |
Pin Configuration:
| S. No. | Pins | Pin Description |
|---|---|---|
| 1 | VCC | Input voltage (3V to 5V) |
| 2 | GND | Ground |
| 3 | D0 | Digital pin |
| 4 | A0 | Analog pin |
Applications:
- This sensor is used to measure the hydrogen concentration within the air.
- It detects gas leakages within industries.
- The gas sensor is used in mines.
- Used in AC & refrigerators.
