If our products have any problems, we can provide replacement / Return Service, welcome to contact us anytime!NDIR CO2 Sensor PWM NDIR Infrared Carbon Dioxide Sensor Module Serial Port 0-5000PPMDescription:1, working voltage: DC4-6V2, the working current: 50mA average | - peak 100mA3, the detection range: 0-5000ppm4, detection accuracy: ± 50ppm5, preheating time: 180S6, analog output voltage: 0.4-2V (linear output)7, digital output: serial data output (9600, N, 8,1)8, response time: ≤ 30S9, working temperature: 0 ~ 60 ℃10, working humidity: 0 ~ 90% RH11, storage temperature: -20 ~ 60 ℃12, the service life: 5 years13, size: 57mm × 35mm × 15mm14, the weight of size: 17gFeatures:1, three ways signal output; (analog output / serial port UCHAR output)2, the serial port Uchar signal can be accessed microcontroller IO serial port; (TTL level 9,600, N, 8,1)3, analog linear output 0.4-2V, the higher the concentration the higher the voltage;4, with PWM modulation waveform output, read more convenient;5, the module uses (NDIR) infrared technology for carbon dioxide has a good choice;6, the module is light weight, small size, long life, good stability and so on.This module can be widely used in HVAC and air quality monitoring, industrial process and monitoring, agricultural andlivestock production process monitoring, and fresh air system carbon dioxide detection.Package included:1 x NDIR CO2 Sensor