Congratulations on your purchase of this Extech Meter. The Carbon Dioxide (CO
2
) Monitor is designed
for air quality control and health control by measuring Carbon Dioxide level in areas where CO
2
could
be a concern. The measured CO
2
value in ppm (parts-per-million), Temperature, Humidity and Time
will be displayed on the LCD along with three CO
2
status indications: Good (0 to 800ppm), Normal
(800 to1200ppm), Poor (>1200ppm). An acoustic alarm sounds when the CO
2
level exceeds a dened
level. This meter is shipped fully tested and calibrated and, with proper use, will provide years of
reliable service.
Operation
1. Power button (rear)
Turns the unit on or o.
2. (rear) HOLD button
Freezes the current reading in the display.
3. (rear) °C/°F button
Selects °C or °F
4. (rear) Clock button
Press and hold this button for 2 seconds to
enter into clock mode. Press the “ ” or “▲ ▼”
button to adjust the ashing digits. Press the
clock button again to step through the
settings (day:month:year;hour:minute).
Press the “ESC” button to exit the clock setting mode.
5. Alarm button
Press the Alarm button once to activate the Alarm mode. The icon appears on LCD
display. If the measured value exceeds the dened value, the alarm will sound and the
display will ash. Press the button again to exit the Alarm mode.
Alarm Value Setting
Press and hold the ALARM button for 2 seconds to enter into setting mode. The icon
will ash.
Press the or ▲ ▼ button to increase or decrease the value.
Press the ESC button to exit the setting mode.
“GOOD-NORMAL” and “NORMAL-POOR” Value Setting
In the Alarm Value Setting mode, press the ALARM button to set the GOOD NORMAL
threshold value. “GOOD NORMAL” will appear in the display. Adjust the value as needed.
Press the ALARM button again to set the NORMAL POOR threshold value. “NORMAL
POOR” will appear in the display. Adjust the value as needed.
Press the ESC button to exit the mode.
6. ▲button
Press this button to increase a value. Press the “ESC” button to exit the function.
7. ▼button
Press this button to decrease a value. Press the ESC button to exit the function.
8. MAX MIN button
Press the button once, the ”MAX” icon appears and the Maximum measured value of
CO2, temperature and humidity will be displayed on the screen. The display will be
updated only if a higher value is measured. Press this button again, the ”MIN” icon
appears and the Minimum measured value of CO2 temperature and humidity will be
displayed on the screen. Press ESC button to exit the function.
