Standard Specification  
Operating Principle Non-dispersive infrared (NDIR)
Measured gas Carbon dioxide (CO2)
Measurement range CO2 0.04 to 2% Volume CO21
Accuracy ±0.02% volume CO2 ±3% of reading
Dimensions 33.5 mm x 20 mm x 8.5 mm
Maintenance Maintenance-free2
Life Expectancy > 15 years (in normal commercial environments)
Operation temperature range 0 to 50 °C
Operation humidity range 0 to 85% RH (non-condensing)
Power supply 4.5 V to 5.25 V
Power Consumtion 300 mA peak, 30 mA average
Serial communication UART, Modbus protocol
Outputs  
Alarm output (open collector) Open >8500 ppm, closed
PWM output 0 to 100% duty cycle for 0 to 20 000 ppm