GX-6000 Operator’s Manual Overview • 68
Chapter 4: Calibration Mode
Overview
This section describes the GX-6000 in Calibration Mode. In Calibration
Mode, you can move through a menu of screens to do the following:
• Perform a fresh air (zero) adjustment
• Perform a span adjustment on all channels simultaneously using
auto calibration
• Perform a span adjustment on one channel at a time using single
calibration
• Perform a bump test
NOTE: You can set up the GX-6000 to alert you during the startup sequence
when calibration is due. See “Updating the Calibration Reminder
Setting” on page 149.
CAUTION: BEFORE EACH DAY’S USAGE, SENSITIVITY IN THE
%LEL RANGE MUST BE TESTED ON A KNOWN
CONCENTRATION OF THE COMBUSTIBLE TARGET GAS,
METHANE, EQUIVALENT TO 25 - 50% OF FULL SCALE
CONCENTRATION (the %LEL full scale is 100 %LEL).
ACCURACY MUST BE WITHIN -0 to + 20% OF ACTUAL.
ACCURACY MAY BE CORRECTED BY FOLLOWING THE
CALIBRATION INSTRUCTIONS FOR THE COMBUSTIBLE
CHANNEL BELOW.
If the combustible channel passes the above response test and does not
require calibration, the unit should still be calibrated periodically. The
optimum frequency of calibration depends heavily on how the GX-6000 is
used. For example, instruments used daily may need to be calibrated weekly
or monthly, while instruments that are used only a few times a year may need
to be calibrated before each use. Typical calibration frequencies range from
monthly to quarterly. Make sure to perform the combustible channel response
test as described above and make sure to develop a calibration schedule
tailored to your application that takes this test and required calibration
resulting from this test into account.
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