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OPERATION (CONTINUED)
FIELD CALIBRATION MODE (CONTINUED)
Field Calibration Method
General
The field calibration method may be
set by the user, and can be changed
or modified at any time using a field
calibration method described in this
section. Totals or flowrate derived
from the field calibration are being
invoked when the (FAC) icon is no
longer visible below the
6-digit display.
Factory calibration settings are
programmed into each computer
during manufacturing, using Stoddard
test solvent at 70° F (21° C) for
meters up to 1 inch. Meters 1-1/2 inch
and larger are factory calibrated using
water at 70° F (21° C).
Settings are correct for light liquids
such as water, gasoline or diesel.
Readings using the factory calibration
(FAC) may not be accurate in some
situations, for example, "heavy"
liquids such as motor oil, under
extreme temperature conditions, non-
standard plumbing configurations or
Verify Accuracy before Beginning Field Calibration
For the most accurate results,
dispense at a flowrate which best
simulates your actual operating
conditions. Avoid "dribbling" more fluid
or repeatedly starting and stopping
the flow. This can result in less
accurate calibrations. Make sure you
meet the meter's minimum flowrate
requirements.
• Low Flow meter: 0.3 GPM
• 1 inch meter:
• 2 inch meter:
(1.1 LPM)
3.0 GPM
(11 LPM)
30 GPM
(113 LPM)
with fluids other than
mentioned above.
For improved accuracy under such
conditions, the computer allows for
field calibration, that is, user entry
of custom calibration parameters. A
"single point" field calibration curve
may yield acceptable accuracy when
used in a non-standard application,
however, the computer is capable
of programming a "five point" field
calibration curve.
NOTE: If the calibration method is
changed when in calibration mode,
i.e., not using the default factory
calibration (FAC), the programming
will allow the user to adjust the user
programmable calibration table for
the calibration method selected. This
is done by shunting the user to the
field calibration method entry menu
specific to that calibration method
upon exit from the calibration mode.
The use of a uniformly dependable,
accurate calibration container is
recommended for the most accurate
results. A five gallon calibration
container is available in the parts
section of this manual. For best
results, the meter should be installed
and purged of air before field
calibration.
Due to high flowrates on meters
2 inch and larger, it is strongly
recommended that field calibration
be completed with a combination of
volume and weight determined with
fine resolution scales.
17
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