38 • Chapter 5: User Mode and Calibration
GasWatch 3 for CO and O
2
4. Use the tubing to connect the regulator to the inlet of the calibration cup.
5. While in User Mode, press AIR to scroll to
BUMP
.
6. Press and release POWER/MODE. The display shows the gases assigned to Cylinder A
and their assigned calibration values (see pg.54 if the calibration values do not match the
calibration gas cylinder’s concentrations). The bottom of the screen alternates between
“CYL A” and “BUMP”.
7. If necessary, use AIR to scroll to the Bump screen for the gas(es) you want to bump test.
As shipped from the factory, CO and O
2
are both assigned to Cylinder A.
8.
Make sure the GasWatch 3 has been turned on for at least 45 seconds before
continuing.
9. Turn the regulator knob counterclockwise to open the regulator.
10. Press and release POWER/MODE.
11. The gas reading flashes, the bottom of the screen alternates between “APLY” and
“BUMP”, and the bottom of the screen counts down from the time set in
BUMP.SET\SETTING\GAS.TIME
.
To back out of the gas application screen without performing the bump test, press and
release AIR and POWER/MODE together.
BUMP
CYL A
0.0
%
50
ppm
BUMP
0.0
%
50
ppm
APLY 30
20.9
%
0
ppm
BUMP 30
20.9
%
0
ppm
