micro-trak FLOWTRAK II, Reference Manual

Page: 24 / 44

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This procedure is used to verify and fine-tune the flowmeter
calibration. Every flowmeter is calibrated with water at the
factory and stamped with a calibration val ue. Enter that value
as a starting point and use this pro ce dure to fine-tune that
value for your specific in stal la tion and spray ing application.
This procedure should be re peat ed each time a new solution
is being applied (differ ing so lu tions will have different spe-
cif ic gravities and different flow char ac ter is tics) or when the
flowmeter in stal la tion has been altered.
P
rocedure
:
1. Put enough water in the sprayer tank to perform this
test. (Preferably 100 gallons or more. The larg er the
volume of water used, the more accurate will be the
calibration.)
2. Start sprayer pump and turn on booms. Run enough
water to purge all air from lines. Turn off booms but
leave pump running.
3. Turn console rotary selector to the VOLUME po si tion.
Select the counter (1-3) that you want to use. Press and
hold the RESET button until the dis play reads 0 (about 2
seconds).
4. Turn on all booms, and run a known amount of water
(preferably 100 gallons or more).
*
5. Turn off all booms. Compare the console’s VOLUME
reading with the known amount of water run. See
Illustration. If the two amounts are within one or two
per cent, no fine tuning is required. If the two amounts
are more than two or three percent dif fer ent, con tin ue
with the next step.
6. With the console still in the VOLUME position and in
HOLD, enter calibration (boom switches OFF, hold the
CAL button until red warning light comes on; about one
second). The dis play will show the flowmeter calibration
value and the CAL icon.
7. Momentarily press the CAL button. The CAL icon will
begin to flash and the total volume will be displayed.
8. When the TOTAL VOLUME value is displayed, use the “+” or
“-” button to adjust the value to match the amount of
water run.
9. Momentarily press the CAL button. The word CAL and
the flowmeter calibration number will be displayed.
You will notice that the flowmeter calibration value has
changed. Write down the new flowmeter calibration
value. This is your “fine tuned” calibration value, keep it
for future reference.
10. Exit calibration by holding the “CAL” button until the red
warning light goes out (about one second).
*
The most accurate method to measure the volume of
water run is to place a container under EVERY nozzle and
add together the amount from each nozzle. This assures
that 100 percent of the water is collected and that all
nozzles are spraying equally. It is important to perform
this pro ce dure at a flow rate similar to that which will
be used in the field. It is also possible to disconnect the
main boom line and run it to a large measuring container
but a valve must be installed and properly adjusted to
simulate actual field conditions.
WIDTH
CAL
FLOW
CAL
MIN
FLOW
TARGET
RATE
SPEED
CAL
TEST
SPEED
VOLUME /
MINUTE
DISTANCE
AREA /
HOUR
VOLUME
(1) (2) (3)
RATE SPEED
AREA
(1) (2) (3)
TANK
CAL
RESET
MANAUTO
CALHOLD
1 2 3 4 5
II
TANK
VOL
TANK
ALARM
RUN
HOLD
Calibration
(cont)
Fine Tuning Flowmeter Calibration Value