72 • Chapter 4: Calibration Mode
GX-6000 Operator’s Manual
3 . If the unit prompts you for the password, enter it by using the
▲
AIR and SHIFT
▼
(PANIC) buttons to select each password number and then pressing and releasing
POWER/ENTER to enter the number and move on to the next one.
NOTE:
You will only be prompted to enter a password if the
PASSWORD
menu item
in User Mode is set to
ON
. See “Turning the Password Function On or Off” on
page 98 for instructions to update the
PASSWORD
setting and to choose a
password.
4 . The Calibration Mode Screen displays with the cursor next to
AIR CAL
.
5 . Press and release the POWER/ENTER button. The Fresh Air Reading screen will
display.
6 . If you suspect any low-level VOC background in the area, you will need to use the
VOC zero filter.
NOTE:
If you have both a PID and a CO
2
sensor installed, you will need to follow the
directions in “Performing a Demand Zero for Instruments with a Carbon
Dioxide Sensor and a PID Sensor” on page 203 instead of following the
directions shown below.
a. Remove the plug from each end of the VOC zero filter.
b. Attach the VOC zero filter to the inlet fitting or probe. The filter does not have a
preferred flow direction.
c. Let the instrument draw through the VOC zero filter for 1 minute before
continuing.
CAL
CAL MODE
AIR CAL
AUTO CAL
SINGLE CAL
NORMAL MODE
AIR
CH4 O2
%LEL %
H2S CO
ppm ppm
VOC
ppm
0 20.9
0.0 0
0