Omega FTB690A Serie Guía De Usuario página 6

Switching between different units will not corrupt
the Total's contents. For example, in GL mode,
the computer totalizes 10.00 gallons, if the user
switches to LT mode, the display will read 37.85
litres (the same volume, different unit).
The "field" calibration may be set by the user,
and can be changed or modified at any time
using the calibration procedure described below
in the Calibration Section. Totals or flowrate
derived from the field calibration are invoked
when the FAC icon is no longer visible on the
top line of the display.
CALIBRATION
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:
FTB690A Series Meters
1/2 inch meter
3/4 inch meter
1 inch meter
1-1/2 inch meter
2 inch meter
The use of a uniformly dependable, accurate
calibration container is recommended for the
most accurate results. Due to high flowrate, it
is strongly recommended that calibration be
completed with a combination of volume and
weight using fine resolution scales. For best
results, the meter should be installed and purged
of air before field calibration.
Field Calibration with
Computer Display
Field Calibration and Factory Calibration are
defined in the Operation Section. Factory
calibration settings are programmed into each
computer during manufacturing, using water
at 70° F (21° C). Readings using the Factory
Calibration (FAC) may not be accurate in some
situations, for example, under extreme tem-
perature conditions, non-standard plumbing
configurations or with fluids other than water.
4
1 GPM (3.8 LPM)
2 GPM (7.5 LPM)
5 GPM (18.9 LPM)
10 GPM (37.9 LPM)
20 GPM (75 LPM)
Field Calibration Procedures
(Dispense/Display Method)
1. To field calibrate, press and hold CALI-
BRATE and DISPLAY buttons for about 3
seconds until you see FLdCAL. Release
both buttons and you will see dd000.0.
You are now in the field calibration mode.
2. Dispense a known amount of fluid at a
flowrate representative of the application.
Any amount between .1 and 999.9 units
can be used. Display will count up while
fluid is flowing through the meter.
3. The DISPLAY button can then be pushed
to select the digit location and the CALI-
BRATE button can be pushed to scroll the
desired value at the blinking position. Edit
the amount shown with the value that was
dispensed above. Values from 000.1 to
999.9 can be entered.
4. When satisfied with the value, press both
CALIBRATE and DISPLAY buttons simul-
taneously. CALEnd will be displayed and
unit will go back to normal operation, less
the FAC (factory calibration) icon.
5. The meter will now be operating with a cus-
tom calibration number unique to the above
dispense procedure. No unit of measure
(gallon, litre, etc.) icon will be highlighted.
NOTE: To return to factory calibration (FAC),
press and hold both CALIBRATION and
DISPLAY buttons for about 3 seconds, until
FAcCAL is displayed. Then release buttons.
Unit should return to normal operation and
FAC icon visible.
NOTE: If the field calibration mode is entered
and NO fluid is dispensed, then upon leav-
ing, the computer will use data from the last
successful field calibration.