32 • Calibration Mode
GX-2009 Operator’s Manual
Calibration Mode
This section describes the GX-2009 in Calibration Mode. In Calibration Mode, you can move
through a menu of screens to do the following:
•
Set the date and time
•
Perform a fresh air adjustment (part of a calibration)
•
Perform a span adjustment on all channels simultaneously (part of a calibration)
•
Perform a span adjustment on one channel at a time (part of a calibration)
•
Perform a bump test (if
Bump Test Function
is set to
On
using the
GX-2009 User Setup Program)
•
Discharge the batteries with the REFRESH function
NOTE:
You can set the GX-2009 to alert you during the startup sequence when calibration
or bump testing is due with the GX-2009 User Setup Program. See the GX-2009
User Setup Program Operator’s Manual for information on setting the
Cal. Limit
Display
and
Bump Limit Display
parameters.
CAUTION:
BEFORE EACH DAY’S USAGE SENSITIVITY IN THE
% LEL RANGE MUST BE TESTED ON A KNOWN CONCENTRATION OF
THE COMBUSTIBLE TARGET GAS, TYPICALLY 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-2009 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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