2
SECTION 1
General Description
The Model IAQ10 is a hand-held meter to
measure Carbon Dioxide (CO2), displayed
in units of parts per million (ppm). An
NDIR sensor in the top end of the meter
measures gas content by diffusion through
sensing holes.
The IAQ10 ships in a pouch that provides a
small amount of protection to the display
and the sensing holes in the top of the
instrument case. The instrument ships with
batteries (which are not installed), a
calibration sheet, and this Owner’s Manual.
SECTION 2
Theory of Operation: NDIR Sensor
The IAQ10 measures carbon dioxide
concentration by relying on one of the
natural properties of CO2 molecules: CO2
molecules absorb light at a specific wave-
length of 4.26 µm. This wavelength is in the
infrared (IR) range. High concentrations of
CO2 molecules absorb more light than low