22 7821 User Instructions
Modes of Operation
5.6 Gravity Mode
The Gravity Mode feature provides a means of adjusting the scale’s internal calibration
factors to compensate for variations in acceleration due to gravity at different
geographic locations. These differences can cause a given mass to indicate a slightly
different weight at an end-user’s (local) site than it did at the Calibration (CAL) site.
To make the adjustment, you must know the value of the gravity constant for the local
site. This value is expressed in meters per second, per second (i.e., m/s2). It is not
necessary to calibrate the scale, therefore, no calibration weights are needed to make
this adjustment.
The scale maintains two gravity setting values. The first is the “calibration-site” value
known as CAL-G. The second is the end-user or “local-site” value and is known as
LOC-G. When the scale was originally calibrated at the factory, the CAL-G and LOC-G
values were both set to 9.8040 which is the gravity constant for the manufacturing site.
To adjust the displayed weight value to accurately reflect an applied test weight, you
can either recalibrate the scale or adjust the local gravity setting.
To view the calibration or local gravity values, you must access the DIAG menu and
scroll to LOC-G or CAL-G message and press the UNITS key.
To view or adjust the Local Gravity value, set Switch 2 to the OPEN position. The
display will indicate the current “local” gravity value. Press the ZERO key to increment
the value or the UNITS key to decrement the value. The gravity value will change in
steps of .0002. When the correct value is displayed, return Switch 2 to the CLOSED
position. The scale will now use this new relationship between calibration and local
gravity for its weight calculations.
WARNING: Using this feature in “sealed” applications may be subject to
approval by the appropriate governing agency at the end-users site.
Gravity value roles over at 9.8400 and rolls under at 9.7700.
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