TeeJet 844-AB Sprayer Control - Manual (Page 18)

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844-AB
Adjust pressure
If an approximate operating pressure is known, use the Plus or
Minus keys to adjust the value. The 844-AB will determine what
operating speed is required to achieve the target application rate
at the entered pressure. If the speed is too high, a set of smaller
nozzles is necessary. If the speed is too low, a set of larger nozzles
is necessary.
Figure 55: Adjust pressure
1 2 3 4 5 6 7 8 9 10 11 12
2.8
Bar
6.8
70.0
L/Ha
Km/H
Adjust speed
If an adjustment to the speed setting is required, press the
Programme key once. The speed units will flash. Use the Plus
or Minus keys to adjust the speed to the desired value. The 844-
AB will calculate the required pressure to maintain target application
rate at the entered speed. If the pressure is too high, a set of larger
nozzles is necessary or the speed must decrease. If the pressure
is too low, a set of smaller nozzles is necessary or the speed must
increase.
Figure 56: Adjust speed
1 2 3 4 5 6 7 8 9 10 11 12
5.2
Bar
10.0
70.0
L/Ha
Km/H
Liquid density
To activate the Liquid density setting, press the Auto/man key.
The D symbol will be displayed at the top of the screen. The Liquid
Density that is programmed into the console will also be displayed.
To change density, press the Plus or Minus keys. Press the
Programme key to accept the changes and return to the current
application setup step. The calculations will use the Specific gravity
(Density).
To revert back to the calculation based on spraying water, press the
Auto/man key.
Figure 57: Liquid density
1.28
1 2 3 4 5 6 7 8 9 10 11 12
NOTE: If a liquid with a density other than water will be sprayed,
and that density was programmed into the Specific gravity
(Density) step during System setup mode, the “D” symbol
must be selected during Application setup mode to activate
the alternate density.
Press the Auto/man key during Application setup mode to
activate the alternate density. A “D” will be displayed at the
top of the console to indicate the alternate density is active.
This must be displayed so that all calculations will use the
alternate density during operations. If the “D” is not at the top
of the display, calculations will be based on water (1.00).
Figure 58: Liquid density
1 2 3 4 5 6 7 8 9 10 11 12
70.0
5.7
10.0
Bar
Km/H
L/Ha
After performing the calculations, advance to the beginning of
Application Setup mode to make changes by pressing the
Programme key. If no changes are necessary then Application
setup mode is complete. Press and hold the Programme key for
three seconds. Changes to Application setup mode will be stored in
the console’s memory.
NOTE: The 844-AB console will not automatically power down
during Application setup mode. The system must be exited
by holding the Programme key for three seconds. A loss
of power to the controller during Application setup mode will
erase all changes not saved to system memory.