3 - Description
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Menu 3.1.1.1 Sprayer speed constant
The theoretical speed constant, pulses per unit (PPU), is the
number of times the speed sensor records holes (or protrusions /
magnets) per metre as the wheel rotates past the sensor. If
necessary, this can be calculated by dividing the number of
protrusions by the circumference of the tyre in metres.
÷
NOTE! It is recommended to use the practical method,
described below in menu [3.1.1.2 Sprayer speed practical].
As a guideline, PPU with commonly used tyres and standard speed
ring (36 protrusions) on HARDI sprayers are:
Menu 3.1.1.2 Sprayer speed practical
Practical calibration of speed is done by driving a measured
distance, then correcting the display readout so that the actual
and the calculated distances are the same.
÷
NOTE! The calibration should take place in the field with a
half full tank and with normal working tyre pressure in order
to obtain the wheel’s real “working radius”.
μ
ATTENTION! Changing tyres will require a new calibration!
Method
1. Measure a distance not less than 70 metres.
2. Park the tractor at the start of the measured distance.
3. Press . When the display read “zero distance [0 m]”.
4. Drive the distance.
5. Press .
6. Correct the distance shown on the display to read the actual distance driven.
7. Press to see the new calculated value.
8. Press again to accept the value.
Tyre Size PPU
230/95R48 (11.2x48) 6.919
300/95R46 (12.4x46) 6.592
300/95R52 (12.4x52) 6.060
340/85R48 (13.6x48) 6.376
467/80R38 (18.4x38) 6.692
528/80R38 (20.8x38) 6.331
650/65R42 (26x42) 5.994
Sprayer speed constant
PPU
Shows and permits change to
the constant, Pulses Per Unit
(meter / feet)
Sprayer practical
Measure up a distance more
than 70 meters or 200 feet.
Then drive distance
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