35
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
(please refer to En ter ing Flow me ter Calibration Value, page
32).
This procedure should be re peat ed each time a new
solution is being applied
(dif fer ing so lu tions will have a
different spe cif ic gravities and dif fer ent flow char ac ter is tics)
or when the flowmeter in stal la tion has been altered.
PROCEDURE
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 TOTAL FLOW po si-
tion. Press and hold the RESET button until the dis play
reads 0 (about 3 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 TOTAL FLOW
reading with the known amount of water run.
See
Illustration 41.
If the two amounts are within one or two
per cent, no fine tuning is required and you may exit cal-
i bra tion. 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 TOTAL FLOW position, enter
calibration
(boom switches OFF, hold CAL until red light
comes on; about three seconds).
The dis play will al ter-
nate
(at about three second intervals)
between the flow-
me ter calibration value and the TOTAL FLOW value.
(To
tell which is which, watch for the word “CAL” on display.
It will be present with the flowmeter cal i bra tion value
but not with the TOTAL FLOW value.)
7. When the TOTAL FLOW value is displayed, use the “+” or
“-” button to adjust the value to match the amount of
water run.
NOTE: Once a value has been selected for ad just ment,
the display will stop alternating between the two values.
This allows you to “fine tune” the value se lect ed. After 64
seconds of neither “+” or “-” being pressed, alternations
will resume. Turning the rotary selector away from, then
back to the desired position will also cause alternations to
resume.
8. Once the display again begins alternating, you will
notice that the flowmeter calibration value has changed.
If the TOTAL FLOW value is correct, write down the new
flowmeter calibration value. This is your “fine tuned”
calibration value, keep it for future reference.
9. Exit calibration by holding “CAL” until the console’s red
light goes out (about three seconds).
*
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.
Calibration
(cont)
Fine Tuning Flowmeter Calibration
Illustration 41
WIDTH
CIRC
MIN
FLOW
FLOW
CAL
AREA
HOUR
APP. RATE
TOTAL AREA
SPEED
DISTANCE
FLOW
RATE
TOTAL FLOW
SUB AREA
BOOM
SEL
TEST
SPEED
ADJUST
RATE
TARGET
RATE
AUTO
MAN
CAL
RESET
MANAUTO
HOLD
MT-2400
™
LR
Test Speed
Test speed is a built-in ground speed simulator that is used in
performing pre-field checks. When a typical operating speed
is entered, the MT-2400 will respond as if you were actually
driving that speed. It allows you to simulate your spraying
application with plain water, while remaining stationary, to
make certain that all of the equipment is operating properly
and that your sprayer can actually perform the intended
application.
Test speed is cancelled by exiting CAL. Test speed will not
accumulate Distance or Area measurements. Please refer to
Pre-Field System Checkout.
