CO2 - Gas Sensor Module

The module CO2-4K-3M-P is designed to measure the
concentration of Carbon-dioxide in the air. This concentration is an
reliable indicator for the “quality” of the air in e.g. a conference
room. The higher the concentration of CO2 the worse is the quality
of the air. High values of CO2 concentration in the air make a
person tired and the mental performace will decrease. In “fresh
air” the concentration of CO2 is 0.034% (vol) which corresponds
to 340 ppm. The indoor concentration in offices should not exceed
1000 ppm, and the maximum allowable concentration is 5000 ppm.
The CO2 module CO2-4K-3M-P is based on an optical mesurement
principle. infrared radiation of wavelength 15 μm is emitted
from a light source and is detected by a wavelength selective
detector. Depending on the length of the optical path and the
concentration of CO2 the light is absorbed (and re-emitted in all
directions).
Measurement range is 400 ppm ... 4000 ppm with a resolution
of 20ppm. The response time is about 180 seconds and there is
no pump necessary to drive the module. Output format is PWM.