Calibration
CO2 CALIBRATION
The meter is calibrated to a standard 400ppm CO2 concentration at the factory
NOTE: When the accuracy becomes a concern or after a year of use, return to Extech for a
standard calibration.
CAUTION: Do not calibrate the meter in an atmosphere of unknown CO2 concentration.
1. Place the meter in the 400ppm calibration chamber. Turn the meter on
and hold down the CAL/Esc and MODE/ buttons simultaneously to
enter CO2 calibration mode. 400ppm and “CAL” will blink on the LCD
while performing calibration.
2. Wait about 5 minutes until the blinking stops. The calibration is then
completed and the meter automatically returns to the normal mode.
NOTE: Ensure the batteries are fresh prior to calibration to prevent an interruption or failed
calibration.
RH CALIBRATION
The meter is calibrated to a standard 33% and 75% salt solution bottle.
CAUTION: Do not calibrate the humidity without the default calibration salt. Otherwise, permanent
damage could occur. Contact the Extech for calibration salts or services.
33% calibration
1. Plug the sensor probe into 33% salt bottle.
2. In the normal mode, Press and Hold the CAL/Esc and DP/WBT/
buttons to enter the 33% calibration. “CAL” and calibrating value (32.7%
if at 25°C) will blink on the LCD with current temperature at the left.
3. The meter is now calibrating, and will finish in about 60 minutes when
“CAL” and humidity stop blinking.
75% calibration
1. After the 33% calibration, plug the sensor probe into a 75% salt bottle.
2. Press the MN/AV button to enter 75% calibration.
3. “CAL” and calibrating value (75.2% if at 25°C) will blink on the LCD
with current temperature at the left.
4. The meter is now calibrating. Wait about 60 minutes until the blinking
stops, then calibration is completed and the meter will return to normal mode.
NOTE: Single point calibrations are allowed. To calibrate 33% only, press CAL/Esc and exit when
33% calibration is completed. To calibrate 75% only, press MODE/ within the 5 minutes
while initializing 33% calibration.
PC CONNECTION
The meter is equipped with an RS-232 PC interface jack (3.5mm phono) for connection to a PC.
The supplied cable and Windows
TM
compatible software allows the user to store readings in a text
file and display real-time measurements in a series of selectable formats. For more information or
specific operating instructions, refer to the User Guide included with the software.
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