MQ-9

MQ‑9 Carbon Monoxide Detection Sensor – Rapid, High‑Sensitivity CO Monitoring

The MQ‑9 is a compact, low‑power semiconductor sensor engineered for detecting carbon monoxide (CO) across a wide concentration range. It employs a heated metal‑oxide surface that changes resistance in response to CO molecules, enabling quick analog voltage output proportional to gas concentration. Its rugged design and low operating voltage (5–30 V) make it ideal for portable safety units, automotive exhaust monitoring, and industrial HVAC systems.

• Operating Voltage: 5–30 V DC
• Detection Range: 20 – 1000 ppm CO
• Response / Recovery Time: Approximately 10 s/10 s
• Common Use Case: Real‑time CO level monitoring in residential, commercial, and automotive environments for safety compliance and air‑quality analytics