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Chapter 5: User Mode and Calibration • 43
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 and its assigned calibration
value (see pg.47 if the calibration value does not match the calibration gas cylinder’s
concentration).
5. For toxic gas cylinders, it is important to vent the regulator while installing it onto the
cylinder. Venting the regulator during installation helps prevent air from getting into the
cylinder and degrading the gas. Open the regulator by turning the knob counterclockwise
and install it onto the cylinder.
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 for all gases except Cl
2
and NH
3
. Allow Cl
2
and NH
3
gas to flow for 2 minutes.
10. Press and release POWER MODE.
GAS CAL
A-CAL
SO2
5.00
A-CAL
ppm
SO2
0.00
A-CAL
ppm
SO2
0.00
APPLY
ppm