Comfort Chek
400 Operation Manual
1509-9000 Rev 2
1
1. OVERVIEW
1.1. Welcome
Thank you for purchasing the Comfort
Chek
400 indoor environmental quality
monitor. The Comfort Chek
400 is an easy-
to-use, portable device for monitoring indoor
air quality. It utilizes an infrared CO
2
sensor
plus temperature and relative humidity (RH)
sensors.
The Comfort Chek
400 is a rugged, hand-
held, battery-powered IAQ instrument for
measuring and displaying carbon dioxide
(CO
2
), Temperature and RH indoors. It
operates from internal alkaline batteries or
wall adapter.
The Comfort Chek
400 is equipped with
integral CO
2
, temperature and RH sensors to
aid in verifying readings providing an
indication of air quality.
NOTE:
Calibration and repair are available at
our manufacturing facility and through some
of our authorized and trained distributors.
If after reading the manual you have any
questions, please contact our customer
service department for technical support.
Figure 1-1. Comfort Chek
400
Figure 1-2. Comfort Chek
400 Kit