Descriptions: MH - Z19 C02 gas sensor is a common type, small sensors, using the non-dispersive infrared (NDIR) principle to detection of our fleet in the air, has good selectivity, no oxygen dependence, long life, built-in temperature compensation: lotus digital output and waveform output at the same time, easy to use. The sensor is a high performance sensor which combines mature infrared absorption gas detection technology with precision light path design and sophisticated circuit design. Features: This MH - Z19 C02 gas sensor has high sensitivity, high resolution. Providing a variety of forms output modes, such as UART and PWM wave. Anti-water vapor interference, no poisoning. With temperature compensation, excellent linear output. Low power consumption, good stability and long lifespan. It is widely used in the HVAC refrigeration and indoor air quality monitoring. Specifications: Product model: MH-Z19B Detection of gases: C02 Working voltage: 3.6V-5.5 V DC Average current: <18mA Shop mouth level: 3.3V Measuring range: 0-0.5%Vol Preheating time: 3min Working temperature: 0-50 ℃ Work humidity: 0-95%RH Size: as the picture Weight: 7 g Package Included: 1 x MH-Z19 Infrared CO2 Sensor