GX-2012 Operator’s Manual
Using Maintenance Mode • 97
5. When the unit tells you to release the AIR
button, release it. The unit will count
down from 8 as it performs the fresh air adjust.
Once it has finished, it will return to the
AIR CAL
menu screen.
Calibrating Using Auto Calibration
If
CL EXPRD
is set to
NOT USE
and calibration becomes due, then the unit must be
calibrated using this menu item and/or the next menu item,
ONE CAL,
because it will not
be possible to enter normal operation. See “Calibration/Bump Test Supplies and
Equipment” on page 56 for the items you will need to perform a calibration. These
instructions assume you are using a 4-gas cylinder and a %volume methane cylinder.
NOTE:
If the combustible gas channel(s) are calibrated to a gas other than
methane, use an appropriate multigas cylinder or use single calibration
to calibrate the combustible channel(s).
1. Perform a fresh air adjust. See previous section for instructions.
2. Install the demand flow regulator onto the calibration cylinder.
3. Connect the sample tubing to the demand flow regulator.
4. Install the hose and probe to the GX-2012.
5. You may only calibrate either the standard 4 sensors or the % volume combustible gas
sensor at a time. Once you are finished, you are returned to the initial AUTO CAL
screen and must begin the auto calibration process again.
6. Use the AIR
or (SHIFT)
buttons to display the
AUTO CAL
menu item. Press
and release the POWER ENTER button to display the calibration values screen. If
you want to exit back to the main menu without completing a calibration, press and
release the DISPLAY (ADJ) button.
AdJ
8
MAINTENANCE
sec
RELEASE
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