Campbell CS475 Dokumentacja Pobierz pdf (Strona 10)

CS475, CS476, and CS477 Radar Water Level Sensor

3.4 Installation Recommendations

Before installing the radar sensor, you must consider all the suggested

guidelines for site and maintenance issues. Do not attempt to install the sensor

unless you are qualified to perform the installation. The sensor is designed for

safe operation in accordance with the current technical, safety and ANSI

standards.

If you are uncertain of the safe installation and operation of

this unit, read and understand all the instructions included

in this manual before attempting any installation or

operation.

CAUTION

3.4.1 Site Selection

1. Handle the sensor carefully, since it is a precision instrument.

2. Mount the sensor high enough to prevent submersion during flooding

conditions.

3. Ensure that the sensor is mounted securely to prevent any movement.

Since the sensor is commonly installed over water

from tall structures, use appropriate safety equipment

such as a safety harness or a life preserver when you

install or perform maintenance on the sensor.

WARNING

4. Install the sensor above the smoothest part of the water surface.

The smoothest part of the water surface is typically found

halfway between bridge piers. However, bridges with long

spans between the piers experience more vibration. For these

bridges, vibration can be minimized by mounting the sensor a

quarter to a third of the distance to the next pier.

NOTE

5. Align the antenna horn within 1° of vertical to prevent trigonometric

measurement errors. (A level indicator is provided on the top cap of the

sensor for zero bubble).

6. Avoid mounting near horizontal structural surfaces such as beams,

brackets, and sidewall joints because these surfaces reflect a strong signal.

If these structures cannot be avoided, use the false echo learn command to

map out the interfering structures in the beam profile (see Section 5.2.1).

7. Center the sensor beam a minimum of 2.5 m from any obstruction in the

measurement range. Obstructions to be aware of include excessive waves,

splashing, pipes, wires, and logs. Note that the radiation beam spreads as

it leaves the sensor (see Tables 3-2 and 3-3).

Usually the beam path is 10° for the CS475, and 8° for the

CS476/CS477.

NOTE

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