Campbell CNR4 Instrukcja Obsługi Pobierz pdf (Strona 12)

CNR4 Net Radiometer

4. Quickstart

Please review Section 7, Operation, for wiring and CRBasic programming.

Appendix D, CNF4 Heater/Ventilator, provides information about using the

CNF4 heater/ventilator.

4.1 Siting Considerations

1. Mount the sensor so no shadows or reflections will be cast on it at any

time of day from obstructions such as trees, buildings, or the mast or

structure on which it is mounted. If the instrument is h meters above the

surface, 99% of the input of the lower sensors comes from a circular area

with a radius of 10h. Shadows or surface disturbances with a radius < 0.1h

will affect the measurement by less than 1%.

2. To avoid shading or reflection effects and to promote spatial averaging,

the CNR4 should be mounted at least 1.5 m above the ground or crop

surface. It is recommended that the CNR4 be mounted to a separate

vertical pipe at least 25 ft from any other mounting structures.

3. Orient the sensor towards the nearest pole to avoid potential problems

from shading.

4.2 Mounting

A mounting bracket kit, pn 26120, is used to mount the CNR4 directly to a

vertical pipe, or to a CM202, CM203, CM204, or CM206 crossarm. Mount the

sensor as follows:

1. Attach the mounting rod to the CNR4 (see FIGURE 4-1).

FIGURE 4-1. Attaching the mounting rod to the CNR4 body

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 69 70

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Campbell CNR4 Instrukcja Obsługi Strona 12