MQ-9 Semiconductor Sensor for CO/Combustible Gas Sensitive material of MQ-9 gas sensor is SnO 2, which with lower conductivity in clean air. It make detection by method of cycle high and low temperature, and detect CO when low temperature (heated by 1.5V). The sensor’s conductivity is more higher along with the gas concentration rising. When high LM35 is commonly used temperature sensor that can be used to measure temperature with an electrical o/p comparative to the temperature (in °C). It can measure temperature more correctly compare with a thermistor. This sensor generates a high output voltage than thermocouples. Overview. This methane gas sensor detects the concentration of methane gas in the air and ouputs its reading as an analog voltage. The concentration sensing range of 300 ppm to 10,000 ppm is suitable for leak detection. 2014 - MQ4 GAS SENSOR. Abstract: MQ4 Sensor Text: ) sensor to your design. Itâ s suitable for designing gas leakage equipment. The board features an MQ-4 sensor , a calibration potentiometer, a mikroBUSâ ¢ host socket, two jumpers and a power indicator LED , concentrations from 200 to 10000ppm. The MQ-4 methane sensor has a sensor layer made ... MQ-2 Smoke Sensor Circuit Built with an Arduino. In this project, we will go over how to build a smoke sensor circuit with an arduino board. The smoke sensor we will use is the MQ-2. This is a sensor that is not only sensitive to smoke, but also to flammable gas. The MQ-2 smoke sensor reports smoke by the voltage level that it outputs. MQ-5 LPG Gas Sensor Datasheet Download Summary . MQ-5 LPG (Propane) Gas Sensor manufacturer datasheet including full specifications, ratings and package dimensions.