Mq4

MQ‑4 Methane Gas Sensor – Compact, High‑Sensitivity Detection

The MQ‑4 is a low‑power metal‑oxide semiconductor sensor engineered for fast, reliable detection of methane (CH₄) as well as other combustible gases such as LPG, natural gas, and ethylene. Its thin‑film TiO₂ sensing element generates a measurable change in resistance when target vapors adsorb onto its surface, providing an analog voltage proportional to gas concentration. Ideal for portable safety devices, HVAC systems, and industrial monitoring, the MQ‑4 offers a compact footprint and minimal power consumption (max 40 mW). Its robust design tolerates temperatures up‑to 200 °C and operates comfortably across 5–20 VDC.

• Detection Range: 10 ppb – 10 % (vol/vol) methane
• Operating Voltage: 5–20 VDC (recommended 5 V)
• Response Time: < 10 s to reach 90 % steady‑state
• Common Use Case: Methane leak detection in residential and industrial environments, automotive tail‑pipe monitoring and safety alarms