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The MH-Z19B carbon dioxide (here in after referred to as the sensor) is a general-purpose intelligent small sensor that uses the principle of non-dispersive infrared(NID IR) to detect the presence of CO2 the air. It has good selectivity, no oxygen de-pendence, and long life. Features; built-in temperature compensation; at the same time with serial output, PWM output, easy touse The sensor is a high-performance sensor made by closely combining mature infrared absorption gas detection technology with optical design and sophisticated circuit. Features: Wide Application -- For HAVC equipment/ Air quality monitoring equipment/ Fresh air system/ Air purification equipment/ Smart home/ Schoo and other pubulic space, to take control for carbon dioxide gas. High Sensitivity CO2 Sensor -- MH-Z19 NDIR infrared gas module using non-dispersive infrared (NDIR) principle to detect the existence of CO2 in the air, with good selectivity, non-oxygen dependent, low power consumption and longevity. Easy to Use -- Built-in temperature compensation, excellent linear output; The CO2 sensor modual with serial output ( UART) , analog output and PWM PWM waveform output methods, good stability, very easy to use. Premium Quality Long Lasting -- Gas chamber with gold plating, waterproof and corrosion resistant, -water vapor interference, not poisoning. What CO2 Sensor Do -- Accurate CO2 Generator Control. CO2 is a greenhouse gas that is natural and in small quantities but as levels rise it can be to your health. Most commonly produced by the air exhale, CO2levels concentrate indoors with less ventilation. Specification: Product model number: MH-Z19B Gas Detection: Carbon Dioxide Supply voltage: 4.5~5.5V DC Average current: <20mA (@5V power supply) Peak current: 150 (@5V supply) Interface level: 3.3V (5V compatible) Measurement : 0~10000ppm can be selected within the Warm-up time: 3min Response time: T90<120s Working temperature: 0～50°C Operating Humidity: 0 to 95% RH (non-condensing) Packing List: 1 * MH-Z19 MH-Z19B Infrared CO2 Sensor Module

Wide Application -- For HAVC equipment/ Air quality monitoring equipment/ Fresh air system/ Air purification equipment/ Smart home/ Schoo and other pubulic space, to take control for carbon dioxide gas. High Sensitivity CO2 Sensor -- MH-Z19 NDIR infrared gas module using non-dispersive infrared (NDIR) principle to detect the existence of CO2 in the air, with good selectivity, non-oxygen dependent, low power consumption and longevity. Easy to Use --Built-in temperature compens