Greisinger co transmitter gt10 co2 1r greisinger gt10 co2 p the greisinger gt10 co2 1r is a high quality and precise co sup2 transmitter works according to the infrared principle ndir an auto calibration procedure compensates aging effects this ensures the excellent long term stability of this transmitter p p due to the fact that co sup2 is an important indicator for air quality in rooms it is very important for modern climate control to measure the co sup2 content p p due to