Great Plains Industries FM-300U Owner's Manual - Page 6
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Selecting a Different
Calibration Setting
To select a different calibration setting,
first press and hold the CALIBRATE but-
ton. Continue to hold it while also briefly
pressing and releasing the DISPLAY
button. (You may then also release the
CALIBRATE button.) The flag indicators in
the upper area of the display will change
to show the newly selected calibration
setting. Calibration settings change in
this order: GAL or LTR, CAL B, CAL C
(etc.). While fluid is flowing, only the GAL
or LTR or CAL B selections may be made,
however, when NO fluid flow is occurring,
any setting may be selected.
Flowrate Mode
Some models include a Rate of Flow
feature (accessed by briefly pressing
and releasing the DISPLAY button as
described above). When this feature is
activated, the word FLOWRATE displays
to the left of the bottom line and the num-
bers in the middle of the display reflect
the rate of flow (instead of total). Most
units are set to update the display every
5 seconds, so the first reading after flow
starts or changes and the last reading
after flow stops or changes will be cor-
rect. This is normal.
Propeller
A small propeller displays to indicate liquid
is flowing through the meter.
Field Calibration
Factory calibration settings are custom-
programmed into each flowmeter during
production, and are correct for light fluids
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, viscos-
ity, temperature, and flowrates all effect
meter accuracy. To ensure accuracy, it is
important to check accuracy frequently
and field calibrate when necessary.
6
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 material 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 flowrates that best simulate your actual
operating conditions. Avoid "dribbling"
more fluid or repeatedly starting and stop-
ping the flow. These actions will result in
less accurate calibrations.
Up to 15 points can be field calibrated on
the field calibration curve. This multi-point
field calibration can improve accuracy
when operating characteristics (usually
flowrate) are not uniform. For example, if
you plan to measure flowrate that varies
widely, a multi-point field calibration at
different flowrates can improve accuracy.
During calibration, make sure you meet
the meter's minimum flowrate require-
ments of 2 GPM (7 LPM).
Before calibrating, purge the system of
air using instructions in the Before Each
Use section.