MQ-8 is a Metal oxide semiconductor (MOS) type sensor from the series of MQ gas sensors (MQ-2, MQ-3, MQ-4, and so on). The module is highly sensitive to Hydrogen gas and can be used to detect any leaks or presence of Hydrogen gas in the air.
Features
High sensitivity to hydrogen gas (H₂).
Detects hydrogen concentrations ranging from 100 to 10000ppm.
Provides both analog and digital output signals.
Fast response and recovery times for timely detection.
Simple drive circuit for easy implementation.
Long service life with stable performance.
Adjustable sensitivity via onboard potentiometer.
Compact design suitable for various applications.
Specifications
Parameter
Value
Sensor Type
Semiconductor (SnO₂)
Target Gas
Hydrogen (H₂)
Detection Range
100–10000ppm
Operating Voltage
5VDC
Heater Voltage (VH)
5.0V±0.1V AC or DC
Load Resistance (RL)
Adjustable
Heater Resistance (RH)
29Ω±3Ω (Room Temp)
Heater Consumption
≤900mW
Sensitivity (S)
Rs(in air)/Rs(1000ppm H₂) ≥5
Preheat Time
≥24 hours
Operating Temperature
-10°C to 50°C
Operating Humidity
≤95% RH
PINOUT
Pin
Function
Description
VCC
Input Power Supply
Provides the power supply to the sensor (typically 5V).
GND
Supply Ground
Ground connection for the sensor module.
DO
Digital Output
Provides a digital output signal (high or low) depending on hydrogen gas concentration.
AO
Analog Output
Outputs a variable analog voltage that corresponds to the hydrogen gas concentration.
Applications
Hydrogen gas leak detectors in residential and industrial settings.
Safety systems in hydrogen-powered vehicles and fuel cells.
Industrial process monitoring involving hydrogen gas.
Environmental monitoring for hydrogen emissions.
Integration into microcontroller-based projects for hydrogen detection.
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