MQ2

MQ‑2 Gas Sensor – Ultra‑Sensitive LPG & Smoke Detector

The MQ‑2 is a robust metal‑oxide semiconductor gas sensor designed to detect an array of combustible gases such as LPG, butane, propane, methane, and hydrogen, as well as alcohol vapors and smoke particles. It operates on a simple 5 V supply and outputs a continuously varying analog voltage proportional to gas concentration, making it ideal for low‑cost safety and monitoring applications.

Equipped with a temperature‑controlled ceramic heater and a low‑power consumption design, the MQ‑2 delivers quick, reliable readings with a typical response time of 10–20 seconds. Its wide dynamic range (0.02% to 5% V/V) and environmental immunity allow it to function reliably in both indoor and outdoor environments, from automotive diagnostics to industrial leak‑detection systems.

• Key Spec 1: Sensor Type – Metal‑oxide semiconductor (MOS) with a ceramic substrate and built‑in heater.
• Key Spec 2: Detected Gases – LPG, propane, butane, methane, hydrogen, alcohol, and particulate smoke (0.2 % to 5 % concentration).
• Key Spec 3: Output – 0 V to 5 V (analog) with optional digital threshold switching via external comparator.
• Common Use Case: Compact smoke/alarm sensors, automotive exhaust monitoring, industrial gas leak detection, and portable breath‑analysis devices.