9
You will see the “CAL” (calibration) and “go”
messages switch back and forth on the screen .
To advance or skip to the next submenu,
press the button once .
Zero Calibration (Firmware version 1.7
Only)
Note:
Zero calibration is performed auto–
matically at startup with firmware version 1.4.
To perform a zero (fresh air) calibration,
press and hold the button . Release when
“go” displays continuously without flashing
on and off .
There will be a countdown from 10 to 0 .
When it is done, the display will show “dn”
(done) .
Note:
To interrupt the zero calibration while it
is in progress, press and hold the button . The
countdown stops, and the display shows “no .”
Press the button again to confirm and advance to the next
submenu .