Feature: 1. LONG TERM STABILITY: The stability of the NDIR CO2 sensor basically depends on the light source, and the long term stability of the NDIR is extremely excellent compared to other types of gas sensors when the light source is not abnormal 2. WIDE RANGE OF MEASUREMENT CONCENTRATION: The working principle of the NDIR CO2 sensor is to detect the infrared energy of the infrared absorption band of the measured gas. The characteristic of the signal is that when there is no measured gas, the signal strength is maximum. The heavier the concentration, the smaller the signal, and the measured concentration can reach 5000PPM 3. APPLICATION SCENARIO: Carbon dioxide sensor is suitable for air quality monitoring equipment, air purification equipment, fresh air system, HAVC system, car air purification, smart home 4. STABLE AND RELIABLE: The CO2 concentration detection sensor has high sensitivity, low power consumption and good stability. The measurement interval is 2 seconds, and the self calibration cycle defaults to 7 days 5. DURABLE MATERIAL: The CO2 gas sensor adopt ABS and metal material. Waterproof and corrosion resistant, possess long service life, provide great convenience for your life Specification: Item Type: Carbon Dioxide Sensor Material: ABS, metal Measured Gas Type: CO2 Measurement Principle: NDIR Measuring Concentration Range: 400ppm-5000ppm Measurement Interval: 2 Seconds Measurement Accuracy: ± (50ppm +5% of reading) Response Time: 90 Seconds Operating Temperature Range: 0-50℃ Operating Humidity Range: 0-90%RH (non condensing) Storage Temperature Range: -20℃-60℃ Life Span: 10+ Years Communication Interface: Uart/ⅡC PWM Output: Period: 1004ms, Pulse: 2ms-1002ms (0-5000ppm) Alarm Output: Concentration >1000ppm, output 1, concentration <800ppm, output 0, pin is open leakage output mode, non sunction Self Calibration Period: The default self calibration period is 7 days. Package List: 1 x Carbon Dioxide Sensor