NORAC UC4+BC+HD5 Part 1 - Manual (Page 13)

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4.3.1 General Mounting Rules for UC4+ Ultrasonic Wing Sensors:
a) In its lowest position, the sensor mouth must be 9 inches or more from the ground.
b) The bottom of the sensor must be at least 9 inches in front of the spray nozzles.
c) The bottom of the sensor must be at least 9 inches above the spray nozzles.
d) Ensure that there are no obstructions within a 12-inch diameter circle projected directly below the
center of the sensor.
e) The sensor should be approximately vertical at normal operating heights.
Figure 8: Sensor Mounting Guidelines