Omega FTB691A Guia Del Usuario página 6

Selecting a Different
Calibration Setting
You can switch between GAL and LTR modes
at will without "corrupting" totalizer contents.
For example, the computer can totalize 10.00
gallons. If the user switches to LTR mode, the
display will immediately change to "37.85" (the
same amount in units of liters). GAL / LTR
switching also works in FLOWRATE mode.
To select a different calibration setting, first press
and hold the CALIBRATE button. Continue to
hold it while also pressing and releasing the
DISPLAY button. (You may then also release
the CALIBRATE button.) The flag indicators
in the top line of the display will change to
show the newly selected calibration setting.
Calibration settings change in this order:
GAL, LTR, CAL B, GAL, etc. While fluid is
flowing, only the GAL and LTR selections may
be made. However, when NO fluid flow is
occurring, any setting may be selected.
Field Calibration
Factory calibration settings are custom-
programmed into each flowmeter during
production, using water at 70°F (21°C). Readings
using the standard factory calibration curves
may not be accurate in some situations
– for example, under extreme temperature
conditions. You can field calibrate the meter
if you are using fluids other than water.
For improved accuracy under such conditions,
the OMEGA flow computer allows for "field"
calibration, that is, user entry of custom cali-
bration parameters. A "single point" calibration
may yield acceptable accuracy in the middle of
the flow range, but 5 or more calibration points
may yield a higher level of accuracy, especially
at the lower end of the flow range. Up to 15
custom calibration points can be entered.
The use of a uniformly dependable, accurate
calibration container is highly recommended
for the most accurate results. Due to high
flowrate, it is strongly recommended that Field
Calibration be completed with a combination of
volume and weight using fine resolution scales.
Before Beginning Field Calibration
For the most accurate results, dispense at a
flowrate which best simulates your actual oper-
ating conditions. Avoid "dribbling" more fluid or
4
repeatedly starting and stopping the flow –
these actions will result in less accurate calibra-
tions.
Make sure you meet the meter's minimum
flowrate requirements:
FTB690 Series Meters
1/2 inch meter
3/4 inch meter
1 inch meter
1-1/2 inch meter
2 inch meter
For best results, the meter should be installed
and purged of air before field calibration.
Dispense/Display Field
Calibration Procedures
1. Hold down CALIBRATE while pressing and
releasing DISPLAY until the field calibration
curve appears ("CAL B" message will be
displayed). Release both buttons.
2. To calibrate, press and hold the CALI-
BRATE button. While continuing to
hold CALIBRATE, also press and hold the
DISPLAY button. Hold both buttons for about
3 seconds until you see a blinking "dd CAL"
message. Once the "dd CAL" message
appears, release both buttons. You are
now in field calibration mode.
3. Once the buttons have been released
from Step 2, the display will show the
blinking message "run 01". If you want to
exit the calibration now before dispensing
any fluid, go to Step 11.
4. If you want to continue with the calibration,
but have not dispensed any fluid yet, make
your final preparations to your pumping
system, but don't start pumping yet.
5. Start your pumping system so that fluid
flows through the meter. The display
will stop blinking and show the "run 01"
message. Dispense into a container that
allows you to judge the amount of fluid
pumped. When you have pumped the
desired amount (for example, 10 gallons),
stop the fluid flow quickly.
6. Once the flow has stopped, briefly press
and release both buttons. At this point the
computer display will change to "0000.00"
with the left-hand digit blinking.
1 GPM (3.8 LPM)
2 GPM (7.5 LPM)
5 GPM (18.8 LPM)
10 GPM (37.85 LPM)
20 GPM (75 LPM)