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.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.High sensitivity, low power consumptionExcellent stabilityTemperature compensation, excellent linear outputProvide serial port (UART), PWM waveform and other output methodslong lastingAnti-water vapor interference, no poisoningApplication:HVAC equipmentAir quality monitoring equipmentFresh air systemAir purification equipmentSmart homeschoolParameters:Product model: MH-Z19EDetection gas: carbon dioxidePower supply voltage: DC(5.0 +/- 0.1)VAverage current: less than 40mA (@5V power supply) current: 125 mA (@5V power supply)Interface level: 3.3V (compatible with 5V)Measuring range: 400~5000ppm optionalOutput signal: serial port (UART) (TTL level 3.3V); PWMWarm-up time: 1minResponse time: T90 less than 120sWorking temperature: -10~50Storage temperature: -20~60Working humidity: 0~95%RH (non-condensing)Type: B: terminalColour: As ShownMaterial: PC+MetalPackage Contents:1 x MH-Z19E IR Infrared CO2 Sensor ModuleOnly the above package content, other products are not included.Note: Light 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.