Kippzonen CM 4 Pyranometer Manual do Utilizador descarregar pdf (Página 44)

APPENDIX I PYRANOMETER CLASSIFICATION

ACCORDING TO WMO GUIDE 1996

Characteristics

High

quality

Good

quality

Moderate

quality

ISO 9060 classification

Secondary

standard

First class Second class

Response time (95 percent response) < 15 s < 30 s < 60 s

Zero offset:

(a) Response to 200 W/m

net thermal radiation

(ventilated)

(b) Response 5 K/h change

in ambient temperature

± 7 W/m

± 2 W/m

± 15 W/m

± 4 W/m

± 30 W/m

± 8 W/m

Resolution (smallest detectable

change)

± 1 W/m

± 5 W/m

± 10 W/m

Stability (change per year,

percentage of full scale)

± 0.8 ± 1.5 ± 3.0

Directional response of beam

radiation

(The range of errors caused by

assuming that the normal incidence

responsivity is valid for all directions

when measuring, from any direction,

a beam radiation whose normal

incidence irradiance is 1000 W/m

)

± 10 W/m

± 20 W/m

± 30 W/m

Temperature response (percentage

of maximum due to any change of

ambient temperature within an

interval of 50 K)

± 2 ± 4 ± 8

Non-linearity (percentage deviation

from the responsivity at 500 W/m

due to any change of irradiance

within the range 100 to 1000 W/m

)

± 0.5 ± 1 ± 3

Spectral sensitivity (percentage of

deviation of the product of spectral

absorptance and spectral

transmittance from the corresponding

mean within the range of 0.3 to 3 μm)

± 2 ± 5 ± 10

Tilt response (percentage deviation

from the responsivity at 0° tilt,

horizontal, due to change in tilt from

0° to 90° at 1000 W/m

irradiance)

± 0.5 ± 2 ± 5

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 52 53

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