AWG 64 MB MEMORY CARD FOR WII Specifikace stáhnout pdf (Strana 17)

TEAM Climate Monitoring Protocol 3.0

4.3.2 Siting the Radiation Sensor

There are two possibilities for locating the radiation sensor based on the local conditions and

structures present at the site:

• 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

(see Level 3 Siting).

4.3.2.1 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 sit 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 2). 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 2). Mount it properly making sure it is leveled (see section 5.5.2).

• 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 an 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 "” PVC pipe 10-20 cm below the ground and pass the cable through the

PVC rather than bury it unprotected underground.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 61 62

Žádné komentáře

AWG 64 MB MEMORY CARD FOR WII Specifikace Strana 17