Great Plains Industries FM-300H Manuel du propriétaire - 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 cali-
bration 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
numbers 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 correct. 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 dur-
ing production, and are correct for light
fluids such as water or heavier liquids
like pesticides or light oil. However, read-
ings using the standard factory calibra-
tion curves may not be accurate in some
situations – variations in chemical for-
mulation, viscosity, 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 ac-
tual operating conditions. Avoid "drib-
bling" more fluid or repeatedly starting
and stopping 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 accu-
racy when operating characteristics (usu-
ally flowrate) are not uniform. For ex-
ample, if you plan to measure flowrate
that varies widely, a multi-point field
calibration at different flowrates can im-
prove 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.