Used to monitor and alarm CO2 level and room temperature with a relay output or an 0~10VDC output optional 1) Special design for room CO2 indicator and alarm. For example in classrooms, offices and other public places 

2) Real-time detecting and display CO2 level during 0ppm to 20,000ppm CO2 range; Also detecting room temperature from 5 to 65

3) Optional real-time humidity from 5%RH to 95%RH

4) NDIR CO2 sensor technology of infrared self diffusion, 15 years lifetime

5) Self Calibration Algorithm makes it in using without calibration amending

6) Specially provide the altitude calibration

7) The three measured CO2 ranges for 3-LED indicator lights are set by end users

8) 3 LEDs brightness adjustable

9) Optional 1X dry contact output to control a ventilation device

10) Optional 1x0~10VDC output

11) Optional the buzzer alert for CO2 level

12) Optional RS485 interface to connect to a PC or another system

CO2 Indicator / Alert