TeeJet 844-E Sprayer Control - Manual (Page 22)

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844-E Sprayer Control
Calibrate Speed
Speed Sensor Calibration
Default = 250
NOTE: During Speed Calibration, the 844 will automatically sense whether a Wheel Speed or Radar Speed Sensor is being used.
While in the Speed Calibration Programming Step, the calibrate speed symbol
will be flashing at the top of the display. The programmable
value (250) will be displayed in the lower right corner of the display.
Proximity/Magnetic Pulses
The speed sensor needs to be calibrated in order to provide the proper speed and area readings. The value for this step is the number of pulses
generated by the speed sensor in 300 ft / 100 m. This value can be determined by automatic calibration while driving exactly 300 ft /100 m, or by
entering the number manually.
Automatic Calibration
To automatically calibrate the speed sensor, mark off a distance of exactly 300 ft / 100 m. While still in the speed calibration program step, position
your sprayer at the beginning of your 300 ft / 100 m course and press the Plus key and Minus key simultaneously to clear the contents of
the display and to activate the auto calibration mode. When the auto calibration mode has been activated, CAL will be displayed at the lower right
of the display. Next, press the Plus key once to begin the calibration process. Now drive the course and the 844 will count the pulses as the
sprayer moves. The speed at which you drive over the course is not important. Stop the sprayer at exactly
300 ft (100 m in SI mode) and press the Program key to validate the number in the display.
The speed sensor is now properly calibrated.
NOTE: Once the auto calibration mode has been activated, no other functions of the 844 are possible until the console receives speed impulses
for calibration. To deactivate the auto calibration mode, press the key twice.
During the automatic calibration step, the 844 automatically senses if a radar ground speed sensor is installed. If you prefer to enter the speed
value manually, refer to the following instructions.
Manual Calculation:
To manually calculate the proper value for Wheel Speed Sensor pulses, you need to know the circumference of the wheel to which the sensor is
mounted. It can be measured by marking the tire and measuring the distance covered as that mark makes one full revolution.
Then use the following formula:
The result can be entered as an alternative to using the automatic calibration method. Use the Plus key or Minus key to adjust the value.
Press the Program key to validate the value and advance to the next programming step.
radar Speed pulses
Automatic Calibration:
The automatic calibration of a Radar speed sensor is similar to the automatic calibration of a wheel speed sensor. Refer to the directions above.
When the console has determined that a Radar Speed Sensor is being used, rAd will be displayed in the lower left of the console display.
Manual Calculation:
To manually enter the radar calibration value, first press the Auto/Manual key to put the control console into radar mode. When the Control
Console is in the manual radar calibration mode, rAd will be displayed in the lower left of the console display. Now use the Plus key or Minus
key to adjust the value. When the correct value has been entered, press the Program key to validate this value.