MQ-2 (Smoke sensor-HBO, LPG, Alcohol, Propane, Hydrogen, Methane and Carbon Monoxide)

Description:

Where to use MQ-2:

MQ2 Smoke Gas Sensor Module is a general purpose gas sensor and this Sensor is used to detect the gas leakage of  LPG, Smoke, Alcohol, Propane, Hydrogen, Methane and Carbon Monoxide concentrations ranging from 200 to 10000 ppm. This sensor has a high sensitivity and fast response time. The module outputs a voltage from 0 to 5V relative to the gas concentration. Great with the project for safety purposes.

The MQ2 sensor is one of the most widely used in the MQ sensor series. It is a MOS (Metal Oxide Semiconductor) sensor. Metal oxide sensors are also known as Chemiresistors because sensing is based on the change in resistance of the sensing material when exposed to gasses.

Note: 

The MQ2 gas sensor detects multiple gases, but cannot identify them! That is normal; most gas sensors operate in this manner. Therefore, it is best suited for measuring changes in a known gas density rather than detecting which one is changing.

Internal structure of MQ2 Gas Sensor:  

The MQ2 is a heater-driven sensor. It is therefore covered with two layers of fine stainless steel mesh known as an “anti-explosion network”. It ensures that the heater element inside the sensor does not cause an explosion because we are sensing flammable gasses.

It also protects the sensor and filters out suspended particles, allowing only gaseous elements to pass through the chamber. A copper-plated clamping ring secures the mesh to the rest of the body.

Technical Specifications:

Input Voltage: DC5V
Power Dissipation: 150mA
DO Output: 0.1-5V
AO Output: 0.1-0.3V
Detectable Concentration: 300-10000ppm
With a signal output instruction
Dual signal output (analog output, and TTL level output)

TTL output:

0~5V analog output voltage, the higher the concentration the higher the voltage
The gas, natural gas, city gas, smoke better sensitivity
With a long service life and reliable stability
Rapid response and recovery characteristics