TeeJet 844 Sprayer Control User Manual

Page 31

The 844 will immediately calculate what the pressure would need to be to
maintain the target application rate at this speed. If the pressure is too high, you
will need larger spray tips or will have to slow down. If the pressure is too low,
you will need smaller spray tips or will have to speed up.

Adjust Pressure:

If you wish to adjust the pressure, press the key once so that the pressure
“PSI” (Bar) units begin to flash. Use the or keys to adjust the indicated
pressure to a desired or recommended pressure.

The 844 will immediately determine what the operating speed would need to be
to achieve the target application rate at this pressure. If the speed indicated is
too high, a smaller nozzle is needed. If the speed indicated is too low, a larger
nozzle is needed.

Liquid Density:

All calculations performed in the normal Calculation Step are based on spraying
water. To convert these calculations to the Liquid Density programmed in the
Liquid Specific Gravity (Density) Step in the System Setup Mode (page 24),
depress the Auto/Man key. When calculations are using the programmed
Specific Gravity (Density), the

symbol will be displayed at the top of the

display window. To go back to the calculations based on spraying water, depress
the Auto/Man key.

NOTE: If you are going to be spraying with a different density of liquid
other than water and you have programmed that specific gravity (density)
into the Specific Gravity (Density) Step in the System Setup Mode, you
must select the

symbol at the top of the display in order for all of the

calculations to be performed in the regular spraying mode. If when in the
regular spraying mode, you do not see the

symbol at the top of the

display, this means that you have not selected a different specific gravity
of liquid and that all calculations will be performed with water (1.00). To
spray with a different density liquid, the specific gravity must first be
programmed into the System Setup Mode in the Specific Gravity (density)
step on page 24. Once a number has been programmed into that step,
you must select the

symbol in the Application Setup Mode by

depressing the Auto/Man key.

Note: The tip flow rate, in the lower right corner of the display, will always
display the flow rate in US Gallons Per Minute (Liters Per Minute) {Imperial
Gallons Per Minute} at 40 psi (2 bar), regardless of changes to the
indicated pressure.

After performing the calculations, you can advance to the beginning of the
Application Setup sequence to make any changes by depressing the key
once. If no changes are necessary, you have completed the Application Setup
Mode of the TeeJet 844 Sprayer Control.

NOW, PRESS AND HOLD THE KEY FOR THREE SECONDS, AND THE
ENTIRE APPLICATION SETUP MODE WILL BE STORED IN THE
COMPUTER’S MEMORY.

Note: For your protection, the 844 console will not automatically power
down while in the Application Setup Mode. You must exit properly as
described above to enable the console auto power down feature.

Note: Cutting the power to the controller while in the Application Setup
Mode will not save any changes made into the computer’s memory.