TeeJet LH 1200S - Manual (Page 6)

6 LH A GRO
ALTERNATIVE SPEED TRANSMITTER ON A DRIVE SHAFT
It is preferable on 4 wheel drive tractors, where it is possible to mount a speed
transmitter on the drive shaft, to use this possibility. This requires an other sensor
than the one supplied as standard in the set. This is shown on the diagram. A
bipolar sensor must be used as long as the drive shaft method is used. This
sensor is a different type than the sensor delivered as standard, and must be
ordered seperatly (LH no. 12-900-984).
The distance between sensor and magnets must be 2-3 mm when using this type
of sensor, the 2 magnets must be opposite, one north pole and one south pole
facing the sensor.