... -5000ppm 2. Detection Principle: NDIR 3.Power: 3.0W/highest, 700MW/average Carbon dioxide CO2 Alarm Specification Main features1. Infrared self ... . Temperature sensing element: NTC Thermal resistance6. Power: 3.0W/highest, 700MW/average7. Accuracy: 22°C(72°F)±30ppm+5%Reading8. Operating ...