MQ4 Combustible Methane Gas Sensor Module

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MQ4 combustible methane gas sensor is a MOS (metal oxide semiconductor) type sensor, belonging to the MQ gas sensor family. MQ4 gas sensor is generally used to detect the methane gas concentration within any vicinity; either in-home or a factory & generates output like analog voltage by reading it. Here, the range of concentration for sensing ranges from 300 pm – 10,000 ppm which is appropriate for the detection of a leak. The module mainly includes a detecting element like ceramic based on aluminum-oxide (Al₂O₃), coated with Tin dioxide (SnO2) and arranged within a stainless-steel mesh.

MQ4 gas sensors are mainly used in gas leakage detecting equipment, as they are suitable for the detection of CH4, Natural gas, and LNG while avoiding the noise throughput of alcoholic and cooking fumes as well as cigarette smoke.

MQ4-Combustible-Methane-Gas-Sensor-Module

MQ4 Gas Sensor Key Features

  • Good sensitivity to Combustible gas in a wide range
  • High sensitivity to CH4, Natural gas.
  • Small sensitivity to alcohol, and smoke.
  • Fast response Stable and long life
  • Simple drive circuit

MQ4 Gas Sensor Pinout

MQ4-Pinout
Pin NamePin No.Description
VCC1This pin powers the module, typically the operating voltage is +5V
GND2Used to connect the module to the system ground
DO3You can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer
AO4This pin outputs 0-5V analog voltage based on the intensity of the gas.

Specifications MQ4

  • Sensor Type Semiconductor
  • Power requirements: VCC – 5V±0.1
  • DO output: TTL digital 0 and 1 (0.1 and 5V)
  • AO output: 0.1-0 .3 V (relative to pollution), the maximum concentration of a voltage of about 4V
  • Detection Gas: Natural gas/Methane
  • Detection Concentration: 200-10000ppm (Natural gas / Methane)
  • Interface: 1 TTL compatible input (HSW), 1 TTL compatible output (ALR)
  • Heater consumption: less than 750mw
  • Operating temperature: 14 to 122 °F (-10 to 50°C)
  • RH Related humidity less than 95%Rh
  • O2 Oxygen concentration is 21% (standard condition) – Oxygen concentration can affect sensitivity
  • Load resistance: 20KΩ
  • Sensing Resistance Rs: 10KΩ- 60KΩ (1000ppm CH4)
  • Preheat time: Over 24 hour
  • Standard Encapsulation Bakelite, Metal cap

Applications

  • Used in gas leakage detecting equipment for homes and industry. They are suitable for detecting CH4 and CNG.
  • Industrial Combustible gas detector
  • Portable gas detectors

Datasheet

You can download the datasheet for MQ4 Combustible Methane Gas Sensor Module by clicking the link given below:

See Also: SIM900A Dual Band GSM/GPRS Module | DS3231 Precision I2C Real-Time Clock Module | MT8870D Integrated ISO2-CMOS DTMF Receiver Module