2 CO220-en-US_V1.5 8/20
Introduction
Congratulations on your purchase of the Model CO220 Carbon Dioxide
Meter. This meter measures CO
2
concentration, air temperature, and
relative humidity. The CO200 includes a 99 Memory Datalogger for
storing and retrieving readings with date and time stamping.
The audible alarms make this is an ideal instrument for indoor air
quality (IAQ) diagnostics. Carbon dioxide (CO
2
) is a gaseous
component of the earth’s atmosphere. The concentration of CO
2
in
natural ambient air is approximately 0.04% or 400ppm.
This meter is shipped fully tested and calibrated and, with proper use,
will provide years of reliable service. Please visit our website
(www.extech.com) to check for the latest version of this User Guide,
Product Updates, and Customer Support.
FEATURES
Extra Large LCD simultaneously displays CO
2
Level, Air
Temperature, & Relative Humidity
Displayed Calendar Clock.
Six (6) icons indicate indoor air quality levels (350 / 450 / 700 /
1000 / 1250 / 5000ppm)
Stable NDIR sensor for CO
2
detection
Automatic Baseline Calibration (ABC) function
Audible high CO
2
concentration alarm with selectable high alarm
threshold
Dew Point and Wet Bulb temperature measurements
