ChrisTenone,
actually, the sensor functions well. When i breath on it, the value (which was around 40) increases, then decreases.
I believe this value, is the resistance value of the sensor. Because the Sensor measures the quality of Air, and therefore of NH3, C02, Alcohol, ... . I think i am supposed to use the Graph in the Datasheet to pull out the CO2 level in the air. I wanted to make sure that the values that i receive from the sensor, really are the Resistance of the Sensor (... or are they the quotient?).