The MH-Z19C Infrared Gas Module is a small sensor that uses the non-dispersive infrared (NDIR) principle to detect the concentration of CO2 in air. The sensor features good selectivity and operates independently of oxygen. It has a built-in temperature compensation and outputs the data via a UART or PWM output. Compared to the previous model (MH-Z19B), the preheating time has been reduced from 3 to 1 minute and the power consumption has been optimized. The sensor calibrates itself every 24 hours (can be switched on and off by command), but a zero point calibration can also be activated manually. Technical data:- https://elecena.pl/product/18417563/mh-z19c-ph-infrared-co2-sensor-mh-z19c-pin-header-rm-2-54 2021-05-10 https://elecena.pl/product/18417563/mh-z19c-ph-infrared-co2-sensor-mh-z19c-pin-header-rm-2-54 2021-05-30 https://elecena.pl/product/18417563/mh-z19c-ph-infrared-co2-sensor-mh-z19c-pin-header-rm-2-54 2021-11-21 https://elecena.pl/product/18417563/mh-z19c-ph-infrared-co2-sensor-mh-z19c-pin-header-rm-2-54 2023-01-06 https://elecena.pl/product/18417563/mh-z19c-ph-infrared-co2-sensor-mh-z19c-pin-header-rm-2-54 2023-08-17 https://elecena.pl/product/18417563/mh-z19c-ph-infrared-co2-sensor-mh-z19c-pin-header-rm-2-54 2023-09-03 https://elecena.pl/product/18417563/mh-z19c-ph-infrared-co2-sensor-mh-z19c-pin-header-rm-2-54 2025-08-08