Description: 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. Features: Gas chamber adopts gold plating processing, waterproof and anti-corrosion, long service life. High sensitivity, low power consumption, excellent stability, resistant to moisture. Temperature compensation, remarkable linear output(the more CO2, the higher voltage). It provides a serial port (UART), analog (DAC) and PWM waveform output. Widely used for heating and refrigeration equipment, air purification equipment, air quality monitoring equipment, fresh air system at smart home and school. Specifications: Working Voltage: DC4-6V Working Current: 50mA (average); 100mA(peak) Detection Range: 0-5000ppm Accuracy: ±50ppm Preheat Time: 180S Analog Output Voltage: 0.4-2V (linear output) Digital Output: Serial data output (9600, N, 8, 1) Response Time: ≤30S Operating Temperature: 0~60℃ Operating Humidity: 0~90%RH Storage Temperature: -20~60℃ Size: 5.7*3.5*1.5cm/2.24*1.38*0.59in Package Includes: 1 x Carbon Dioxide Sensor 1 x Cable .