FM-300H & FM-300HR / 920679-06E 5
become the meter’s default after one min-
ute. These factory calibrations (indicated
by FAC) are permanently programmed into
the computer and are not user adjustable.
The “eld” calibration may be set by the
user, and can be changed or modied at
any time using the calibration procedure
described in the Calibration Section.Totals
or owrate derived from the eld calibra-
tion are invoked when the FAC icon is no
longer visible on the top line of the display.
Field Calibration
Factory calibration settings are custom-
programmed into each owmeter during
production, and are correct for light uids
such as water or heavier liquids like pesti-
cides or light oil. However, readings using
the standard factory calibration curves
may not be accurate in some situations
– variations in chemical formulation, vis-
cosity, temperature, and owrates all effect
meter accuracy. To ensure accuracy, it is
important to check accuracy frequently and
eld calibrate when necessary.
Field Calibration Procedures
(Dispense/Display Method)
1. To eld calibrate, press and hold the
CALIBRATE 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 eld calibration mode.
2. Dispense a known amount of uid at
a owrate representative of the ap-
plication.Any amount between .1 and
999.9 units can be used. Display will
count up while uid is owing through
the meter.
3. The DISPLAY button can then be
pushed to select the digit location and
the CALIBRATE buttoncan be pushed
to scroll the desired value at the blink-
ing position. Edit the amount shown
with the value that was dispensed
above. Values from 000.1 to 999.9
can be entered.
4. When satised with the value, press
both CALIBRATE and DISPLAY
buttons simultaneously. CALEnd will
be displayed and unit will go back to
normal operation, less the FAC (fac-
tory calibration) icon.
5. The meter will now be operating with
a custom calibration number unique
to the above dispense procedure. No
unit of measure (gallon, litre, etc.) icon
will be highlighted.
Note: If the eld calibration mode is en-
tered and NO uid is dispensed,
then upon leaving, the computer will
use data from the last successful
eld calibration.
Calibration Container
The desired calibration container should be
uniformly dependable and constructed with
a graduated neck. The container’s volume
indicator should be clearly and precisely
marked. It is helpful if the container’s ma-
terial allows a window through which the
level of liquid can be viewed. GPI offers
a properly designed calibration container
for volumes of 5 gallons or 5 litres.
DO NOT use several smaller containers or
a larger container with a 5-gallon marking.
For the most accurate results, dispense at
owrates that best simulate your actual op-
erating conditions. Avoid “dribbling” more
uid or repeatedly starting and stopping
the ow. These actions will result in less
accurate calibrations.
During calibration, make sure you meet the
meter’s minimum owrate requirements of
2 GPM (7 LPM).
Before calibrating, purge the system of
air using instructions in the Before Each
Use section.
MAINTENANCE
This meter is virtually maintenance free.
It is important, however, that the nutator
disc moves freely.
To prevent drying of chemical on internal
assemblies, meters should be kept free
