UEi Test Instruments AQM4 - Manual (Page 16)

The AQM4 allows you to calibrate CO² and
RH, for CO calibration please send unit to
UEi. To enter calibration mode, place unit
at suitable calibration site specified in the
following sections.
Press + , then also
simultaneously for 3 seconds to turn on the
meter and enter calibration mode (Fig. 33).
Press or to select parameter to
calibrate. To cancel or exit calibration at any
time, turn meter off.
NOTE:
ENSURE THE BATTERIES ARE AT FULL VOLTAGE
BEFORE THE CALIBRATION TO PREVENT
INTERRUPTION OR FAILED CALIBRATION.
The manual calibration is suggested to
be done in sunny outdoor air that is well
ventilated. To begin, enter calibration mode.
Press or to select parameters
for calibration and press enter. The meter
is calibrated at standard 400ppm CO²
concentration at the factory. It is suggested
to manually calibrate regularly to maintain
good accuracy.
NOTE:
WHEN THE ACCURACY BECOMES A CONCERN,
RETURN TO UEi FOR STANDARD CALIBRATION.
CAUTION:
Do not calibrate the meter in the air with
unknown CO² concentration. It could be
calibrated as 400ppm by default which
leads to inaccurate measurements.
Wait 10 minutes until the blinking stops and
the calibration is completed. To cancel the
calibration, turn off the meter at any time.
15
CO² CALIBRATION
CALIBRATION MODE