Hardi SMARTCOM ISOBUS UT SW A.2.2 Series Original Instruction Book page 50

3 - Description
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:
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
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.
50
S p r a y e r s p e e d c o n s t a n t
P P U
S h o w s a n d p e r m i t s c h a n g e t o
t h e c o n s t a n t , P u l s e s P e r U n i t
( m e t e r / f e e t )
S p r a y e r p r a c t i c a l
M e a s u r e u p a d i s t a n c e m o r e
t h a n 7 0 m e t e r s o r 2 0 0 f e e t .
T h e n d r i v e d i s t a n c e