GX-6000 Operator’s Manual
Chapter 4: Calibration Mode • 71
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
.
NOTE:
The following screens illustrate a five-gas GX-6000 for detection of CH
4
(%LEL using catalytic sensor), oxygen, H
2
S, CO, and VOCs (high range PID
sensor). Your GX-6000 may display slightly different screens.
Calibrating Using the Auto
Calibration Method
This method allows you to calibrate the CH
4
(%LEL sensor), oxygen, H
2
S, CO, and VOC
(PID sensor) sensors simultaneously. It is designed for use with either the RKI 5-gas
calibration cylinder (high range PID only) or an RKI 4-gas cylinder and an RKI PID
cylinder and is the quickest and easiest method to calibrate the GX-6000. See Table 16 on
page 128 for available cylinders. Make sure your calibration cylinder is appropriate for the
PID detection range.
NOTE:
The 5-gas calibration cylinder that includes LEL CH
4
/O
2
/CO/H
2
S/isobutylene
is a proprietary gas mix developed by RKI Instruments, Inc. for calibrating a
PID sensor in the presence of the other gases during an auto calibration. It can
also be used for a single calibration of a PID sensor. Do not use a similar gas
mix provided by any other manufacturer when calibrating a PID channel. Use
of a gas mix from another manufacturer that includes isobutylene and these
other gases will result in an inaccurate calibration.
Setting the Fresh Air Reading
1 . Find a fresh-air environment. This is an environment free of toxic or combustible
gases and of normal oxygen content (20.9%).
2 . While in Measuring Mode, press and hold the SHIFT
▼
(PANIC) button, then press
the DISP/LOCK button and release both buttons.
CAL
CAL MODE
AIR CAL
AUTO CAL
SINGLE CAL
NORMAL MODE
