Teejet 844 Sprayer Control User Manual download pdf (Page 25)

Speed Sensor Type

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 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 feet (100 meters). This value can be determined by

automatic calibration while driving exactly 300 feet (100 meters), or by entering

the number manually.

Automatic Calibration:

To automatically calibrate the speed sensor, mark off a distance of exactly 300

feet (100 meters). While still in the speed calibration program step, position your

sprayer at the beginning of your 300 foot (100 meter) course and press the

and keys 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 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 feet (100 meters) and press the

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, depress the

key twice.

During the automatic calibration step, the 844 automatically senses whether a

magnetic sensor or 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:

3600 x {# magnets on wheel (usually 2)}

i.e.

3600 x 2

= 240

___________________________________ ________

Wheel Circumference in inches 30

10,000 x {# magnets on wheel (usually 2)}

i.e.

10,000 x 2

= 250

___________________________________ ________

Wheel Circumference in cm 80

The result can be entered as an alternative to using the automatic calibration

method. Use the or keys to adjust the value. Press the key to validate

the value and advance to the next programming step.

CALIBRATE

SPEED

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 43 44

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Teejet 844 Sprayer Control User Manual Page 25

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