Great Plains TM700 Operator Manual - Manual (Page 35)

5/13/2003 500-052M
33 Adjustments
GPA at 40 psi.
24.86 - 23.76 = 1.10 = 0.79
25.15 - 23.76 1.39
(0.79) (5 PSI) = 3.95 PSI
40 PSI + 3.95 PSI = 43.95 PSI
The 43.95 PSI value is the pressure you should attempt
to maintain on the pressure gauge. It is always a good
idea to interpolate. Attempting to guess what the value
should be, generally gives you an inaccurate result.
When using chemicals, ACCURACY IS CRITICAL.
GPA PSI
23.76 at 40
24.86 at
25.15 at 45
1.10
1.39
?
Difference
Difference 5.0
Differ-
ence
Where Tables are Based on 20" Nozzle Spacing
Other Spacing 8" 10" 12" 14" 16" 18" 22" 24" 30"
Conversion Factor 2.5 2 1.67 1.43 1.25 1.11 .91 .83 .66
Where Tables are Based on 30" Nozzle Spacing
Other Spacing 26" 28" 32" 34" 36" 38" 40" 42" 44"
Conversion Factor 1.15 1.07 .94 .88 .83 .79 .75 .71 .68
Where Tables are Based on 40" Nozzle Spacing
Other Spacing 28" 30" 32" 34" 36" 38" 42" 44" 48"
Conversion Factor 1.43 1.33 1.25 1.18 1.11 1.05 .95 .91 .83
Table 6: Nozzle Spacing
Check Valve Restriction Data
OPM and GPM in the charts are shown at a PSI without
the use of restriction no-drip check valves. Note the
characteristics of the check valves below:
Diaphragm Check Valves may cause = a 2 to 3 PSI
pressure drop at the nozzle. Catch nozzle flow to insure
accuracy.
If you are using a nozzle spacing different than 15”, 20”,
or 30”, you will need to convert the values in the nozzle
charts to determine the correct GPA you will apply. Mul-
tiply the GPA factors in the existing tables by the given
conversion factor for your nozzle spacing.
Miscellaneous Conversion Factors
One Acre = 43,560 Square Feet = 0.405 Hectares
One Hectare = 2.471 Acres
One Gallon Per Acre = 9.35 Liters Per Hectare
One Mile = 5,280 Feet = 1,610 Meters = 1.61 Kilometers
Table 7: Miscellaneous Information
One Gallon = 128 Fluid Ounces = 8 Pints = 4 Quarts
One Gallon = 3.79 Liters = 0.83 Imperial Gallons
One Pound Per Square Inch = 0.069 bar = 6.896 Kilopascal
One Mile Per Hour = 1.609 Kilometers Per Hour
Table 7: Miscellaneous Information