54 • Overview
EAGLE 2 Operator’s Manual
Chapter 4: Calibration Mode
Overview
This section describes the EAGLE 2 in Calibration Mode. In Calibration Mode, you can
move through a menu of screens to do the following:
•
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 fresh air (zero) adjustment
NOTE:
You can set up the EAGLE 2 to alert you during the startup sequence when
calibration is due. See “Updating the Calibration Reminder Setting” on
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 EAGLE 2 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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