Description The Grove - Gas Sensor module is useful for gas leakage detecting(in home and industry). It can detect LPG, i-butane, methane, alcohol, Hydrogen, somke and so on. Measurements can be taken as soon as possible based on its fast response time. Also the sensitivity can be adjusted by the potentiometer. Each Grove - Gas Sensor Kit consists of one gas sensor base and four detectors, including MQ2,MQ3, MQ5 and MQ9. Below is a contrast table of them. You can switch the detector on the base according to specific target gases. MQ-9 - Carbon Monoxide, Coal Gas, Liquefied Gas - 10-1000 ppm CO ; 100-10000PPm Gas Features - High sensitivity to Combustible gas in wide range - Stable performance, long life, low cost - Fast response - Wide detection range - Simple drive circuit Note Hot-swapping the grove may lead to IC burnout, please turn off the power of main board before swapping grove. For all Grove users (especially beginners), we provide you guidance PDF documents. Please download and read through Preface - Getting Started and Introduction to Grove before your using of the product. https://elecena.pl/product/9696415/101020045-arduino-grove-gas-sensor-mq9 2017-08-05 https://elecena.pl/product/9696415/101020045-arduino-grove-gas-sensor-mq9 2018-01-25 https://elecena.pl/product/9696415/101020045-arduino-grove-gas-sensor-mq9 2021-05-21 https://elecena.pl/product/9696415/101020045-arduino-grove-gas-sensor-mq9 2021-11-15 https://elecena.pl/product/9696415/101020045-arduino-grove-gas-sensor-mq9 2023-03-19 https://elecena.pl/product/9696415/101020045-arduino-grove-gas-sensor-mq9 2023-10-04 https://elecena.pl/product/9696415/101020045-arduino-grove-gas-sensor-mq9 2025-04-07