Description:_x000D_ MH-Z14A CO2 gas sensor is a general intelligent small sensor, using the non-dispersive infrared (NDIR) principle to detect carbon dioxide in air, and has a good selectivity and no oxygen dependence, long service life.It has built-in temperature compensation, as well as digital output, analog output and PWM output, convenient to use.This is a high-performance sensor combined with infrared absorption gas detecting technology, precision optical path design, excellent circuit design. _x000D_ _x000D_ _x000D_ Features: _x000D_ Gas chamber adopts gold plating processing, waterproof and anti-corrosion, long service life. _x000D_ High sensitivity, low power consumption, excellent stability, resistant to moisture. _x000D_ Temperature compensation, remarkable linear output(the more CO2, the higher voltage). _x000D_ It provides a serial port (UART), analog (DAC) and PWM waveform output. _x000D_ Widely used for heating and refrigeration equipment, air purification equipment, air quality monitoring equipment, fresh air system at smart home and school. _x000D_ _x000D_ _x000D_ Specifications:_x000D_ Working Voltage: DC4-6V_x000D_ Working Current: 50mA (average); 100mA(peak)_x000D_ Detection Range: 0-5000ppm _x000D_ Accuracy: 50ppm_x000D_ Preheat Time: 180S_x000D_ Analog Output Voltage: 0.4-2V (linear output)_x000D_ Digital Output: Serial data output (9600, N, 8, 1)_x000D_ Response Time: 30S_x000D_ Operating Temperature: 0~60_x000D_ Operating Humidity: 0~90%RH_x000D_ Storage Temperature: -20~60_x000D_ Size: 5.7*3.5*1.5cm/2.24*1.38*0.59in _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 1 x Carbon Dioxide Sensor _x000D_ 1 x Cable