FIGURE 7-3. Housing set screw, mounting loop screws and ground lug
4. Use a bubble level to make certain the antenna horn is aligned within 1° of vertical. A
measurement error will be introduced if the antenna is not perpendicular to the water
surface. The maximum range is reduced because of the off-axis return signal. To use the
bubble level available from Campbell Scientific, do the following:
a. Remove the top cap from the CS475A.
b. Place the bubble level on the top of the CS475A (
(p. 16)).
c. Verify the sensor is level or make the needed changes to level the sensor.
d. Remove the bubble level and replace the cap.
CS475A Radar Water Level Sensor
15