Description

MQ Series Gas Sensor Detector Modules for DIY (MQ 2/3/4/5/6/7/8/9/135)

MQ Series gas sensors are a popular and cost-effective range of electrochemical sensors. They are designed to detect various gases and are widely used in air quality monitoring, industrial safety, and leak detection. Below is a detailed overview of each sensor in the series and the specific gas it detects:

Sensor Target Gas Other Sensitive Gases MQ-2 LPG, Smoke, H2 Methane, Butane, CO MQ-3 Alcohol (Ethanol) Methane, Benzene, Hexane MQ-4 Methane CNG MQ-5 LPG Propane, Butane MQ-6 LPG, Butane Propane MQ-7 Carbon Monoxide (CO) – MQ-8 Hydrogen (H2) – MQ-9 Smoke CO, Methane, LPG MQ-135 Ammonia (NH3), Benzene, Alcohol, Smoke CO2

While these sensors are versatile and useful, they do have some limitations:

Sensitivity: They can detect other gases besides their target gas, which might lead to false alarms.
Accuracy: Their readings can be affected by humidity and temperature changes.
Long-term Stability: Over time, their sensitivity can drift, necessitating periodic calibration.