AIR SYSTEMS INTERNATIONAL BB15 Manuel D'utilisation page 10

Use only 10 - 20 ppm CO gas for calibration. Using a higher concentration may decrease accuracy at
lower scale readings. Note: 10ppm gas must be used to satisfy Canadian calibration requirements.
1. Install regulator to the CO calibration
gas cylinder.
2. Connect the plug to the monitor.
3. Open gas regulator fully by turning the knob at
least two (2) turns counterclockwise.
4. Allow digital display to stabilize
approximately 15 - 30 seconds.
-11-
CO SPAN ADJUSTMENT
5. Adjust the "span" pot adjustment screw
(clockwise to increase, counterclockwise
to decrease) until the digital display reads
the same concentration (ppm) as printed
on the calibration gas cylinder.
6. Turn regulator off and repeat "zero"
adjustment procedure above. Display
should return to a "00" reading.
THE MONITOR IS NOW CALIBRATED AND
SHOULD BE RECALIBRATED MONTHLY OR IF
ACCURACY IS QUESTIONABLE. CHECK
LOCAL REQUIREMENTS AND RECALIBRATE
AS REQUIRED.