MQ8 Hydrogen Gas Sensor Module
MQ8 overview
MQ8 is a Metal oxide semiconductor (MOS) type sensor from the MQ gas sensors family. MQ8 hydrogen gas sensor includes a detecting element like aluminum-oxide (Al₂O₃) based ceramic material that is covered with SnO2 (tin dioxide) and arranged in a stainless-steel mesh. The module is highly sensitive to Hydrogen gas and can be used to detect any leaks or presence of Hydrogen gas in the air. MQ8 gas sensor can detect hydrogen gas concentrations anywhere from 100-10000ppm (parts per million).
This sensor has a high sensitivity to hydrogen gas and a fast trigger response time. The sensor's output is analog resistance corresponding to the concentration of hydrogen gas in the vicinity. The drive circuit is very simple; all that is required to do is to power up the heater coil with 5V, add a load resistance, and connect the output to an ADC. MQ8 gas sensor is low cost and is suitable for all kinds of different applications for detecting poisonous concentrations of hydrogen (H2) gas.
Key specifications
Datasheet
MQ8 features
- Detects H2 Gas concentration in air
- Resistant to LPG, smoke, alcohol
- Heater power consumption: < 800mW
- Can detect H2 gas in the concentration range of 100-10000ppm
- Analog output is continuous
- Compact size
- Less cost
- Dual signal output
- Quick response
- Reliable and long service life
MQ8 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | VCC | This pin powers the module, typically the operating voltage is +5V |
| 2 | GND | Used to connect the module to the system ground |
| 3 | DO | You can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer |
| 4 | AO | This pin outputs 0-5V analog voltage based on the intensity of the gas. |
MQ8 specifications
| Operating Voltage | 5V DC |
|---|---|
| Size | 11 x 33 x 20 mm. |
| Range | 100-10000 ppm. |
| Characteristic gas | 100 ppm CO. |
| Sensitive resistance | 2 to 20 10 Kilo ohm/10 Kilo ohm at 100ppm CO. |
| Sensitivity | ≥ 3%. |
| Return time | ≤ 30 s. |
| Heating resistance | ± 31ohm 3ohm. |
| Heating current | ≤ 180 mA. |
| Reaction time | ≤ 1 s. |
| Heating voltage | 5.0V ± 2V / 1.5 ± 1V. |
| Heating power | approx. 350 mW. |
| Ambient temperature | -20 ° C to + 50 ° C. |
| Humidity | ≤ 95% RH. |
MQ8 applications
- Used in gas leakage detecting equipment for homes and industry.
- Industrial Hydrogen gas detector
- Portable H2 gas detectors
Comments 0
Leave a comment