Campbell Scientific CS475, CS476, and CS477 Radar Water Level Sensor - Manual (Page 24)

CS475, CS476, and CS477 Radar Water Level Sensor
7.2 Sensor Alignment
7.2.1 Vertical
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.
7.2.2 Azimuth
The sensor’s radar beam is polarized so 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 installing 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 hex nut indicate which direction the lobes extend the least. Orient the
sensor such that one of the marks is aligned towards the wall or pier (see
FIGURE 4-1 and TABLE 4-4 in Section 4, Quickstart).
7.3 Instrument Housing Adjustment
After mounting, you can rotate the housing up to 350° to simplify access to the
conduit entry and terminal compartment. Proceed as follows to rotate the
housing to the desired position:
1. Loosen the set screw on the housing.
2. Rotate the housing as desired.
3. Tighten the set screw.
7.4 Wiring
7.4.1 Datalogger Connection
As shipped from Campbell Scientific, the sensor is fitted with a cable for
connection with the datalogger. Appendix A describes replacing this cable.
Connections to Campbell Scientific dataloggers are given in TABLE 7-1. The
sensor should be wired to the channels shown on the wiring diagram created by
Short Cut.
Connect the wires in the order shown in TABLE 7-1. CAUTION
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