micro-trak MT-3405 M, Справочное руководство, Страница: 30 / 56

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 27). This procedure should be repeat ed each
time a new solution is being applied (different so lu tions will
have different spe cifi c gravities and diff er ent flow char ac ter-
is tics) or when the flowmeter installa tion has been altered.
PROCEdURE
Put enough water in the sprayer tank to perform this 1.
test. (Preferably 100 gallons or more. the larg er the
volume of water used, the more accurate the calibration
will be).
Start sprayer pump and turn on booms. Run enough 2.
water to purge all air from lines. Turn off booms but
leave pump running.
Turn console rotary selector to the TOTAL FLOW position.
3.
Press and hold the RESET button until the display reads 0
(about 3 seconds).
Turn on all booms, place the Run/Hold switch in RUN,
4.
and run a known amount* of water (preferably 100
gallons or more).
Place the Run/Hold switch in HOLD to turn off booms.
5.
Compare the console’s TOTAL FLOW reading with the
known amount of water run. See illustration 29. If the
two amounts are within 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.
With the console still in the TOTAL FLOW position,
6.
enter calibration (console in HOLD, hold CAL until red
light comes on; about three seconds). The dis play will
alternate (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 calibration
value but not with the tOtal FlOW value).
When the TOTAL FLOW value is displayed, use the “+” 7.
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 “+”
nor “-” being pressed, alternations will resume.
Turning the rotary selector away from, then back
to the desired position will also cause alternations
to resume.
Once the display again begins alternating, you will 8.
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.
Exit calibration by holding “CAL” until the console’s red
9.
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.
wIdTh BOOM
SELECT
TEST
SPEEd
TARgET
RATE
AdjUST
RATE
CIRC
FLOw
CAL
SPEEd dISTANCE
TOTAL
FLOw
TOTAL AREA
PRESSURE FLOw RATE
SUB AREA
ON
OFF
ON
OFF
1 2 3 4 5
B O O M S
RUN
hOLd
CAL
AUTO
MAN
RESET
MT-3405
M
™
autOMatic rate cOntrOller
MANAUTO
CAL hOLd
v 1 2 3 4 5
MIN
FLOw/
PRESSURE
APP. RATE
30
Calibration
(cont)
Fine-Tuning Flowmeter Calibration
illustration 29