MQ Air Quality Gas Sensor Module [Rectangular PCB]

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:

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.