A carbon monoxide sensor detects dangerous levels of carbon monoxide gas and triggers alarms to alert occupants of potential exposure hazards in buildings with combustion-based heating equipment. These sensors are critical safety devices that prevent poisoning incidents from malfunctioning furnaces, boilers, or ventilation system failures.
Technical Specifications
CO sensors measure concentrations in parts per million (ppm) and activate audible alarms at 70 ppm for 60 minutes or 35 ppm for 240 minutes per UL 2075 standards. Electrochemical and biomimetic sensor technologies offer improved sensitivity and accuracy over older models. Response time to dangerous concentrations typically occurs within 5 to 15 minutes. Sensors require calibration and battery replacement every 5 to 7 years to maintain accuracy.
Integration with HVAC Systems
Modern HVAC systems integrate CO sensors into return air paths and control logic to automatically shut down furnaces and trigger ventilation increases when dangerous concentrations are detected. Smart thermostats and home automation systems can log CO events and send notifications to building managers or occupants.
Regulatory Standards
Building codes require CO detectors in residences with attached garages, fuel-burning appliances, or fireplaces. Commercial buildings must install sensors in mechanical rooms and occupied areas with combustion equipment.