Note: if calibration will be in a high-traffic area or
highly populated area, a slightly higher calibration
value of 400-475 ppm is recommended.
b ). Plug in the Controller and allow it to warm up
for a minimum of 30 minutes but 1 hour is
recommended.
c ). Press HOME button 6 times to activate
the automatic calibration, the [ Calibrat] LED
indicator will be blinking. Press UP or
DOWN , the CO2 level ( 400 ppm ) will be
displayed on the LED and blinking. Press UP or
DOWN to adjust the calibration level if you have
an accurate reference. Otherwise, the
recommended level will be 400 ppm. Press and
hold HOME button 3 seconds to activate the
calibration.
Note: DO NOT exhale or breathe near the sensor
while activating the calibration function.
d ) The LED will display the countdown timing.
e ) When it is completed, the screen will display
normal functions. Calibration will not affect any
other settings.
Note: It may take up to 90 seconds to complete
the calibraton process.
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