Omega FTB690 Serie Bedienungsanleitung Seite 4

Flowrate Feature
When this feature is activated, the word FLOW-
RATE displays to the left on the bottom line.
When FLOWRATE is displayed, the numbers
on the middle line reflect the rate of flow, for
example, the current gallons per minute (GPM)
or litres per minute (LPM).
Display FLOWRATE
To use this feature, press and release DISPLAY
until FLOWRATE appears to the left of the
bottom line.
Activate the Meter
Turn the meter ON by starting water flow or
briefly pressing the DISPLAY button. The meter
will display the Batch or Cumulative Total from
last use.
Press DISPLAY briefly to display the Batch
Total. Hold the DISPLAY button down for 3
seconds to reset the Batch Total to zero.
The meter is programmed to turn off auto-
matically if not used for 4 minutes.
Factory and Field Calibration Curves
All calibration information is visible to the user
as words in the upper part of the display, above
the numeric digits.
All units are configured with a "factory"
calibration curve. Both gallons and litres are
available ("GAL" or "LTR" will be displayed). Use
the CALIBRATE and DISPLAY buttons to switch
between gallons and litres. This curve is NOT
user adjustable: the word "PRESET" is
displayed to show this. (The factory calibration is
stored permanently in the computer's memory.)
The "field" calibration curve 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
visible when the field calibration setting is selected
("CAL B" will be visible on the top line).
2
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 litres). 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 calibration
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.