炜盛 Manuals

Winsensor MQ-7 Semiconductor Gas Sensor Datasheet

The MQ-7 is a semiconductor gas sensor that detects carbon monoxide (CO) using a tin dioxide (SnO₂) sensing layer. It operates with a high‑temperature heating cycle (5 V) for cleaning and a low‑temperature cycle (1.5 V) for detection, providing a simple circuit to convert resistance changes into a concentration‑related output signal. Typical applications include home gas‑leak alarms, industrial CO alarms, and portable gas detectors.

Technical specifications include detection range 10‑1000 ppm CO, heating voltage 5.0 V±0.2 V (high) and 1.5 V±0.1 V (low), heating power ≤350 mW, and a surface resistance of 2 kΩ‑20 kΩ at 100 ppm CO. The document also outlines recommended circuit connections, temperature/humidity test conditions, and extensive handling precautions to maintain sensor performance. This manual is written in Chinese.

Covers: 产品说明书 · 特点 · 应用 · 技术指标 · 基本测试回路 · 灵敏度特性