11
S
N
To install, mount the
first magnet with
the SOUTH pole side
(dashed line) facing
toward the hub or
shaft. Mount the
second magnet with
the NORTH pole side
facing toward the hub
or shaft.
For proper operation, the
magnets must be evenly
spaced around the wheel or
drive shaft. The magnets must
be at least 1” apart.
Magnets
Please read the following information about magnet
spacing and polarity.
The number of magnets that must be used depends on
the size of your tire and where you mount the sensor. On
tractor or implement wheels the general rule of thumb is
one magnet for each wheel bolt (minimum of two, and
always an even number). For drive shafts or small wheels
(ATV’s), two magnets are usually adequate.
Some installations may require that more than two magnets
be installed. To determine the number of magnets required,
measure the distance traveled of one revolution of the
sensor equipped wheel in inches (centimeters).
See the following tables to find the minimum number of
magnets required - must be an even number.
Installation Note: The console provides one connection point
for the speed sensor. A 15 ft. extension cable is provided.
For speed sensor installations on implements, add 3-pin
extension cables as required.
Please Note:
If you have purchased a Vansco radar or other
radar or GPS speed sensor, disregard the following section
on magnetic speed sensors and install the Vansco or other
radar as described in the instructions included with the unit.
You will need an adapter cable to connect to radar or GPS
Speed Sensor,
see Appendix H.
Installation (cont)
Speed Sensor Installation
Locations where the sensor may be installed:
1. Non-driven wheel on tractor, vehicle or implement. This is
less susceptible to errors resulting from wheel slip.
2. Tractor, vehicle or planter drive shaft. This type of
mounting is recommended for trucks, four-wheel drive
tractors or other equipment that has poor or no access
to a non-driven wheel.
See Appendix A for magnetic
speed sensor installation details for various types of
wheels or drive shaft.
English or Turf (inches)
Wheel Circumference
40
80 120 160 200
Number of Magnets
2
4
6
8
10
Metric (cm)
Wheel Circumference
100 200 300 400 500
Number of Magnets
2
4
6
8
10
1” Minimum
NOTE: Magnets may be attached mechanically or
adhered with epoxy or other high quality adhesive.
When using adhesive, thoroughly clean the area of dirt
and oil.
Locate the following parts:
•
Speed sensor cable (green body)
•
Mounting “L” bracket
• Magnets
• Cable ties
North
North
North
South
South
South
1
2
4
3
5
6
Test magnet
should alternately
attract and repel.
Always use an even number of magnets, and always alternate
the polarities of the magnets as you go around the wheel hub
or drive shaft.
The magnets provided
by Micro-Trak are marked
with a punched dashed
line on the SOUTH pole
side of the magnet.
