GasWatch 3 for CO and O
2
Chapter 5: User Mode and Calibration • 55
7 . Use AIR to scroll to the channel whose calibration gas value you want to change.
8. Press and release POWER/MODE. The calibration value begins to flash. In the example
below, the CO channel is selected.
9. Use AIR to adjust the calibration gas value. The calibration gas value in the instrument
must match the value listed on the calibration gas cylinder you are using.
10. Press and release POWER/MODE to save the change. The calibration gas value stops
flashing and the unit returns to the gas name screen.
11. Use AIR to scroll to
ESCAPE
.
12. Press and release POWER/MODE to return to the
CAL--P
item in the
A-CAL
menu.
13. Press AIR to scroll to
ESCAPE
.
14. Press and release POWER/MODE to return to the
A-CAL
item in the
GAS CAL
menu.
15. See “Exiting the GAS CAL Menu” on page 57 to return to User Mode.
Making Cylinder Selections in CYL SEL
The
CYL SEL
menu item allows you to assign cylinders for calibration. As shipped from the
factory, CO and O
2
are both assigned to Cylinder A. There are 5 cylinder assignments
available: A, B, C, D, and E. To calibrate each channel separately, assign each channel to a
different cylinder (ie. Cylinder A: CO, Cylinder B: O
2
).
1. While in User Mode, press AIR to scroll to
GAS CAL
.
2. Press and release POWER/MODE. The
AIR CAL
menu item appears.
CAL--P
CO
ppm
CAL--P
O2
%
ESCAPE
AIR
AIR
AIR
CAL--P
50
CO
ppm
GAS CAL
