CS475, CS476, and CS477 Radar Water Level Sensor
TABLE 3-2. 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 3-3. 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
8.
Be aware that bridges contract and expand with temperature changes.
Traffic loads or trucks can also cause changes to the bridge height.
9.
Do not install the sensor where submerged obstructions such as rocks or
bridge piers can distort or disturb water level.
3.5 Sensor Mounting
3.5.1 Vertical Alignment
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.
3.5.2 Azimuth Alignment
The sensor’s radar beam is polarized so that it emits radar waves in an elliptical
or football shape. You should orient the unit so the lobes are parallel to, and do
not intersect the pier, when you install on a wall or close to a bridge pier. The
radar housing has a large hex nut on its mount stem. Two drill marks below the
7
Summary of Contents for C477
Page 28: ...CS475 CS476 and CS477 Radar Water Level Sensor 24 ...
Page 36: ...Appendix B Entering SDI 12 Commands Changing Settings B 6 ...
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