44 • Chapter 5: User Mode and Calibration
04 Series for CO(-H2)
Performing a Span Adjustment
1. While in User Mode, press AIR to scroll to
GAS CAL
.
2. Press and release POWER MODE. The
AIR
item appears.
3. Use AIR to scroll to the
A-CAL
item.
4. Press and release POWER MODE. The display shows the gas assigned to Cylinder A and
its assigned calibration value (see pg.49 if the calibration value does not match the
calibration gas cylinder’s concentration). The bottom of the screen alternates between
“CYL A” and “A-CAL”.
5. If necessary, use AIR to scroll to the Auto Cal screen for the gas you want to calibrate. As
shipped from the factory, CO is assigned to Cylinder A and H
2
is assigned to Cylinder B.
6. Press and release POWER MODE.
7. The gas reading flashes and the bottom of the screen alternates between “APPLY” and “A-
CAL”.
NOTE:
To back out of the gas application screen without performing the calibration, press
and release AIR and POWER MODE together.
8. Turn the regulator knob counterclockwise to open the regulator.
9. Allow the gas to flow for 1 minute.
10. Press and release POWER MODE.
GAS CAL
A-CAL
CO
50
A-CAL
ppm
CO
50
CYL A
ppm
CO
0
A-CAL
ppm
CO
0
APPLY
ppm
