The core components of a smoke alarm are gas sensors and smoke detection modules, which monitor the environment in real time like an "electronic nose" to ensure that an alarm is sounded at the early stage of a fire. The following is the main information they collect:

1.Smoke particles (aerosols)

Detection principle: optical scattering (photoelectric) or ionization (ionization)

Detection target: tiny particles produced by combustion (such as PM2.5, PM10 level smoke)

Features:

Photoelectric: more sensitive to smoldering fire (such as cotton wool, wood smoldering)

Ion: faster reaction to open flames (rapid combustion)

2.Toxic/flammable gases

Carbon monoxide (CO): colorless and odorless, produced when combustion is incomplete (such as gas leaks)

Volatile organic compounds (VOCs): toxic gases released by the combustion of plastics, paints, etc.

Methane (CH₄)/liquefied petroleum gas (LPG): composite sensor for gas leaks

3.Environmental interference factors (anti-false alarm)

Temperature and humidity changes: avoid false triggering of water vapor and fog

Dust accumulation: automatic calibration to reduce false alarm rate

Airflow influence: optimize detection directionality and enhance stability

High-quality sensor upgrade function

✔ Multi-sensor fusion: smoke + CO + temperature three-in-one detection, accurate judgment of fire conditions

Detection gas	Module	Detection range	Picture
VOC	MQ-P5	1-1000PPM
Temp and Humidity	WHT20
CO	MQ2-CO φ14x5	0-5000ppm(Max 10000ppm)
CO	MQ2-CO φ14x14	0-1000ppm(Max 2000ppm)

✔ Intelligent algorithm: distinguish between cooking fumes, cigarette smoke and real fire

✔ Wireless networking: real-time push alarm information to mobile phones/fire protection systems

Want to know which sensor is suitable for your scenario? Consult now:

ShanXi TengXing Sensor Technology Co.,Ltd

Web: www.tensensor.com

Email: [email protected]