35
844E Sprayer Crontrol
98-70006 R3
Calculation Troubleshooting
This Programming Step is a diagnostic tool only
This programming step has no effect on the operation of the TeeJet 844 Sprayer Control. It allows the user to
adjust the indicated pressure to see what effects it would have on the operating speed; or the user can adjust the
speed to see what pressure would need to be used to maintain the target application rate. This step should help
determine if the correct nozzle size was chosen for the application.
While in the calculation step, either the pressure “PSI” (bar) or speed “MPH” (km/h) units will be fl ashing.
Adjust Speed:
While in the Calculation Step, the user is able to view the nozzle fl ow rate, pressure, speed and application rate
simultaneously. When fi rst entering this step, the speed “MPH” (km/h) units will be fl ashing, indicating that this
digit can be changed. By pressing the or keys, the programmer can change the indicated speed to a
desirable speed or typical operating speed.
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 fl ash.
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 Specifi c Gravity (Density) Step in the System Setup
Mode (page 22), press the Auto/Man key. When calculations are using the programmed Specifi c Gravity (Density),
the D symbol will be displayed at the top of the display window. To go back to the calculations based on spraying
water, press the Auto/Man key.
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