NORAC UC4.5-CS4 - Manual (Page 11)

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4 Ultrasonic Sensor Installation
4.1 Ultrasonic Sensor Mounting Guidelines
The following guidelines will ensure optimal sensor performance and prevent
sensor measurement error. These rules should be followed for both the wing
sensors and the main lift (middle) sensor.
1. In its lowest position, the sensor must be 9 inches (23 cm) or more from the ground.
2. Ensure that there are no obstructions within a 12-inch diameter circle projected directly
below the center of the sensor.
3. The sensor should be approximately vertical at normal operating heights.
Figure 5: Sensor Mounting Guidelines