The MH-Z19E carbon dioxide gas sensor (hereinafter referred to as the sensor) is a general-purpose intelligent small sensor. It has two products: pin and terminal. It uses the principle of non-dispersive infrared (NDIR) to detect CO2 in the air and has good selectivity. No oxygen dependence, long life, etc.<br> The sensor is a high-performance sensor made by closely combining mature infrared absorption gas detection technology with precise optical circuit design and sophisticated circuit design.<br> High sensitivity, low power consumption<br> Excellent stability<br> Temperature compensation, excellent linear output<br> Provide serial port (UART), PWM waveform and other output methods<br> long lasting<br> Anti-water vapor interference, no poisoning<br> Application:<br> HVAC equipment<br> Air quality monitoring equipment<br> Fresh air system<br> Air purification equipment<br> Smart home<br> school<br> Parameters:<br> Product model: MH-Z19E<br> Detection gas: carbon dioxide<br> Power supply voltage: DC(5.0 +/- 0.1)V<br> Average current: less than 40mA (@5V power supply)<br> Peak current: 125 mA (@5V power supply)<br> Interface level: 3.3V (compatible with 5V)<br> Measuring range: 400~5000ppm optional<br> Output signal: serial port (UART) (TTL level 3.3V); PWM<br> Warm-up time: 1min<br> Response time: T90 less than 120s<br> Working temperature: -10℃~50℃<br> Storage temperature: -20℃~60℃<br> Working humidity: 0~95%RH (non-condensing)<br> Type: A: Row Pin<br> Colour: As Shown<br> Material: PC+Metal<br> Package Contents:<br> 1 x MH-Z19E IR Infrared CO2 Sensor Module<br> Only the above package content, other products are not included.<br> Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.