24
The button presses required to change
this menu item are the same as in the
Pipe Diameter Menu above
(see Figure 29-4).
Figure 29-4
OPERATION (continued)
USER CONFIGURATION MODE (Advanced Options - 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 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 user configuration 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 user configuration mode.
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.
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.
25
GETTING
ST
ARTED
SAFETY
/
SPECIFICA
TIONS
ASSEMBL
Y /
INST
ALLA
TION
OPERA
TION
TROUBLESHOOTING
MAINTENANCE
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REP
AIR
Calibration Mode