MH-Z19B NDIR Infrared CO2 Sensor Module Applications MH-Z19B NDIR infrared gas module is widely used in * HVAC refrigeration * Indoor air quality monitoring. * Smart home appliances * School * Air cleaner MH-Z19B NDIR Infrared CO2 Sensor Module Technical parameters * Main Functions and Features * High sensitivity, high resolution * Low power consumption * Output modes: UART and PWM wave * Temperament compensation, excellent linear output * Good stability * Long lifespan * Anti-water vapor interference * No poisoning MH-Z19B NDIR Infrared CO2 Sensor Module Technical Parameters * Target Gas: CO2 * Working voltage: 4.5~ 5.5 V DC * Average current: < 60mA(@5V) * Peak current: 150mA (@5V) * Interface level: 3.3 V(Compatible with 5V) * Preheat time: 3 min * Response Time: T90 < 120s * Working temperature: 0 ~ 50 deg C * Working humidity: 0~ 90% RH (No condensation)