TSI IAQ10 - Manual (Page 4)

2
SECTION 1
General Description
The Model IAQ10 is a hand-held meter to
measure Carbon Dioxide (CO
2
), 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 CO
2
molecules: CO
2
molecules absorb light at a specific wave-
length of 4.26 µm. This wavelength is in the
infrared (IR) range. High concentrations of
CO
2
molecules absorb more light than low