Mq9

Robust Dual Gas Detection: MQ‑9 – Precision Flame & LPG Sensor

The MQ‑9 is a compact, low‑power sensor built around a high‑temperature p‑type tin dioxide (SnO₂) element. It is engineered to provide rapid, reliable detection of both LPG (propane/ethane) and flame, making it ideal for industrial safety, home leak alarms, and fire suppression systems.

Its low power consumption (≈35 mA) and analog/digital output options allow easy integration into microcontroller‐based monitoring systems. The built‑in heater maintained at 300 °C ensures stable semiconductor behavior, while the sensor’s low tolerance for humidity and temperature drift enhances accuracy across a wide operating range.

• Key Spec 1: Supply Voltage: 4.5 V–5.5 V (±10 %) – ensures compatibility with standard 5 V logic levels.
• Key Spec 2: Detection Range: 5–2000 ppm LPG, 500–2000 ppm butane, 1–1000 ppm oxidizing gases – versatile for multiple gas types.
• Key Spec 3: Response Time: 50 ms (digital) – 4 s (analog) – enabling both rapid alarm and precise trend monitoring.
• Common Use Case: Integrated into fire‑safety panels, portable leak detectors, and smart home kits for early warning of LPG leaks or flame presence.