MQ2 Sensor

A GAS sensor or a GAS Detector is defined as a chemical sensor that detects/measures the concentration of gas in its vicinity. MQ2 sensor also known as Chemiresistor ideal for detection or measuring of  LPG, Alcohol, Propane, Hydrogen, CO, and even methane. It offers very good sensitivity and a fast response time makes it ideal such as used in air quality monitors and gas leakage alarm systems. The MQ2 sensor operates at a voltage of 5V DC and draws around 800mW. It provides a lower conductivity to clean the air as a gas sensing material.

MQ2 sensor is a Tin oxide semiconductor sensor designed with higher sensitivity to liquefied petroleum gas, propane, hydrogen, and other combustible vapours. It detects gases anywhere in a range from 200 to 10000ppm. This sensor can detect gas either by digital pin or by analogue pin. The digital low signal light is accessed through the IO ports on the Microcontroller. The analogue output is a concentration, i.e. increasing voltage is directly proportional to increasing concentration. By using the external load resistance the resistance variation is converted into a suitable voltage variation. A small potentiometer in this sensor permits the adjustment of the sensitivity of the sensor circuit. This sensor features long life, low cost, and reliable stability make it particularly suitable for Air quality monitoring applications.

MQ2 sensors are enclosed in two-layer stainless steel that provides an Anti Explosion Network. This is enclosed in order to avoid the heater element explosion, as we are sensing flammable gases. It also provides protection for the sensor and filters out suspended particles so that only gaseous elements pass through the chamber.

Applications:

• Detects or measure Gases like LPG, Alcohol, Propane, Hydrogen, CO, and even methane
• Air quality monitor
• Gas leak alarm
• Safety standard maintenance
• Maintaining environmental standards in hospitals