Introduction
Congratulations on your purchase of this Model CO250 Meter. This meter measures CO2 (Carbon
Dioxide) levels, air temp., dew point, wet bulb temperature and humidity and is an ideal instrument
for indoor air quality (IAQ) diagnosis. This meter is shipped fully tested and calibrated and, with
proper use, will provide years of reliable service.
Meter Description
METER
1. Temperature and Humidity sensor
2. CO2 sensor (rear)
3. LCD display
4. AC Adaptor connector
5. RS232 port
6. Keypad
7. Battery compartment (rear)
LCD DISPLAY
1. CO2 concentration in ppm
2. Relative Humidity in %
3. Air Temperature, Dew Point or
Wet Bulb Temperature
SYMBOLS
TWA Time weighted average (8 hours)
STEL Short-term exposure limit (15 minutes weighted average)
HOLD Freezes current reading on display
MIN/MAX Minimum/Maximum readings
Low battery indicator
DP Dew point temperature
AIR Air temperature
WBT Wet bulb temperature
% Unit of relative humidity
C or F Celsius/Fahrenheit
KEYPAD
Turns the meter on and off.
Enters setup mode.
Sets as non-sleep mode with .
Exits setup page/mode.
Enters CO2 calibration with .
Enters RH calibration with
Freezes the current reading on display.
Cancels data hold function.
Activates or cancels the backlight.
Selects unit or increases value in setup.
Selects AIR, DP, WBT temps display.
Selects unit or decreases value in setup.
Activates MIN,MAX,STEL,TWA function.
Saves and finishes settings.
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