Campbell CS475 Bedienungsanleitung PDF herunterladen (Seite 26)

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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Campbell CS475 Bedienungsanleitung Seite 26