The Grove - Gas Sensor module is useful for gas leakage detecting (in home and industry). It can detect LPG, i-butane, methane, alcohol, Hydrogen, some 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. Symbol MQ-2 MQ-3 MQ-5 MQ-9 Detect Gas Combustible Gas?Smoke Alcohol Vapor LPG, Natural Gas, Town Gas Carbon Monoxide, Coal Gas, Liquefied Gas Detect Concentration 300-10000ppm 0.04-4mg/L Alcohol 300-10000ppm 10-1000ppmCO;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 * Product number: Seeed 101020045 Resources * Manual * Product Wiki * Preface - Getting Started * Introduction to Grove Notes * Hot-swapping the grove may lead to IC burnout, please turn off the power of main board before swapping grove. https://elecena.pl/product/22716929/grove-gas-sensor-mq9-discontinued 2023-03-07 https://elecena.pl/product/22716929/grove-gas-sensor-mq9-discontinued 2023-12-27 https://elecena.pl/product/22716929/grove-gas-sensor-mq9-discontinued 2024-09-19 https://elecena.pl/product/22716929/grove-gas-sensor-mq9-discontinued 2024-11-29 https://elecena.pl/product/22716929/grove-gas-sensor-mq9-discontinued 2024-11-30