The MH-Z19E carbon dioxide gas sensor is a general-purpose, intelligent, small sensor available in both pin and terminal versions. It utilizes the non-dispersive infrared (NDIR) principle to detect CO2 in the air, exhibiting excellent selectivity, oxygen independence, and long lifespan. It features built-in temperature compensation and offers both serial and PWM outputs for ease of use. This high-performance sensor is a result of the close integration of mature infrared absorption gas detection technology with precise optical path design and sophisticated circuit design.