Great Plains TM700 Operator Manual - Manual (Page 31)

5/13/2003 500-052M
29 Adjustments
4. With the sprayer filled with water {no chemical add-
ed}, park in an open area with the booms unfolded.
Prepare to collect samples at the individual nozzles.
Turn on the pump and run it at the operation pres-
sure. If applicable, correctly set the solenoid throt-
tling valves. Refer to “Solenoid Throttling Valve”
on page 51. Flip on the boom section switch{es} on
the control box and catch the water being sprayed
out of the nozzle{s} with cup provided as you are cal-
ibrating.
5. Measure the volume of the sample in ounces over
the time it took to travel the distance in Step #3. The
number of ounces caught is the exact number of gal-
lons per acre you will apply with that perspective
nozzle.
EXAMPLE #1: With a 20 inch spacing, it took 28 sec-
onds to travel the 204 feet {refer to Table #1}. Using a
MeterCone
® 1.875 nozzle at 35 psi, the volume caught
in 28 seconds was 21 ounces. This illustrates you would
apply 21 gallons per acre with this nozzle.
EXAMPLE #2: With a 30 inch spacing, it took 15 sec-
onds to travel 136 feet {refer to Table #1}. Using a
TeeJet

XR11003 nozzle at 30 psi, the volume caught in
15 seconds was 13 ounces. This means you will apply
13 gallons per acre with the XR11003 nozzle at the
same ground speed as when you drove the 136 feet.
Basic Sprayer Calibration
To double check the accuracy of your Great Plains
Sprayer, the following instructions provide another
method of calibration:
Step 1: Measure 200 feet and determine the number of
seconds required to travel this distance under field con-
ditions with implements in working condition.
EXAMPLE: It takes 27 seconds to travel the 200 feet
which equals 5 mph.
Step 2: Place graduated container, provided with boom
calibration kit, under one nozzle and catch the discharge
for 1 minute. Divide 128 into the number of fluid ounces
caught. 128 fluid ounces equals one gallon. EXAMPLE:
64 ounces caught in one minute.
64.0
÷
128 = 0.50 gallons/minute
Step 3: Net determine your nozzle spacing in inches.
EXAMPLE: 1 nozzle every 40".
SOLUTION:
Gallons per acre = 5940 x Gallon per minute
Nozzle spacing in inches x
Miles Per Hour
GPA = 5940 x .50
40 x 5
GPA = 2970
200
GPA = 14.9
The above information will assure you of a check for ac-
curate application in the event there is an error in the
gauge nozzle spacing, nozzle height, tractor speed or
nozzle wear.
Miles Per Hour Calibration
To determine true ground speed, use Table #2 with the
sprayer half-filled with water.
When measuring the MPH of your tractor, always simu-
late current field conditions as close as possible, taking
care to account for wheel slippage.
See application chart when M.P.H. is obtained.
mph
Seconds
to Travel
200 feet
mph
Seconds
to Travel
200 feet
2.5 55 7.0 19
3.0 45 8.0 17
3.5 39 9.0 15
4.0 34 10.0 14
4.5 30 11.0 12.5
5.0 27 12.0 11.5
6.0 23
Table 2: Miles per Hour Calibration