71 • Calibrating Using the Auto Calibration Method GX-6000 Operator’s Manual
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 137 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.
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 102 for instructions to update the
PASSWORD setting and to choose a password.
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