Campbell CS475, Instruction Manual

Page: 22 / 50

CS475, CS476, and CS477 Radar Water Level Sensor
12
pipes, wires, and logs. The radiation beam spreads as it leaves the sensor
(see TABLE 7-1 and TABLE 7-2 ).
Usually the beam path is 10° for the CS475, and 8° for the
CS476/CS477.
TABLE 7-1. Radiation Beam Spread for CS475
(10° Beam Angle)
Distance in Meters Diameter of Footprint in Meters
1 0.18
5 0.87
10 1.76
15 2.64
20 3.53
TABLE 7-2. Radiation Beam Spread for CS476/CS477
(8° Beam Angle)
Distance in Meters Diameter of Footprint in Meters
1 0.14
5 0.70
10 1.41
15 2.11
20 2.81
30 4.216
70 (CS477 only) 9.84
3. Securely mount the sensor.
4. Use a user-supplied bubble level or the 25619 bubble level to make certain
the antenna horn is aligned within 1° of vertical. The cap needs to be
removed when using the 25619. If the antenna is not vertical, a
trigonometric measurement error can occur with respect to the water. The
maximum range is reduced because of the off-axis return signal.
5. Orient the sensor such that one of its polarization markings is aligned with
the wall or pier (see FIGURE 7-1 and TABLE 7-3 ).
NOTE