Campbell CM10K Spécifications télécharger pdf (Page 16)

• A suitable location for the radiation sensor is within reach of the climate station (within

100 m of it), such that it can be connected to the same data logger as the other sensors

(see below).

• A suitable location for the radiation sensor CANNOT be located within 100 m of the

climate station. A new location will need to be found for the radiation sensor. The sensor

will require its own data logger and power source separate from the main climate station.

Finding a suitable location within the vicinity of the climate station. In many cases although

the clearing for the climate station is not appropriate to site the solar radiation sensor, there might

be a structure within the immediate vicinity of the climate station (roof top, pole, water tower)

where the radiation sensor can be installed, fulfilling its siting requirements (no obstacles above

5 degrees from the horizon, Table ). If this is the case, the radiation sensor can be mounted at this

location and connected to the data logger with a cable up to a 100 m long. Since the sensor

produces voltage signals that are very small (mV), the resistance encountered by the signal in

longer cables might compromise its integrity. Use the following guidelines when siting the

radiation sensor:

• Make sure the location for the radiation sensor meets the required siting guidelines

(Table ). Mount it properly making sure it is leveled (see Section 0).

• If the radiation sensor is mounted on a pole, make sure the structure is solid and

stable in the wind. If the structure sways too much in the wind, the reading will be

invalid.

• The radiation sensor might be mounted on a rooftop, but highly reflective or

aluminum rooftops should be avoided, since the sensor will pick up radiation

reflected from the structure (WMO 2008).

• The cable from the sensor to the data logger needs to be ordered with the sensor. Do

not add additional cable to the sensor, since this might compromise the quality of

the reading.

• Secure the cable connecting the sensor to the data logger adequately. If the cable is

left hanging in the air it might be vulnerable to the wind or become a bird perching

site. Strap the cable to the structure all the way down to the floor, and from there

bury it underground to the base of the climate station where the data logger is. It is a

good idea to lay down ½” PVC pipe 10-20 cm below the ground and pass the cable

through the PVC rather than bury it unprotected underground.

Note: If the clearing for the climate station IS appropriate to site the solar radiation sensor, then

it can be attached to the base tower directly using the mounting equipment in the equipment list

(see Appendix A.1).

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Campbell CM10K Spécifications Page 16