Kippzonen CFR Calibration Facility Manual do Utilizador descarregar pdf (Página 26)

CFR manual

25

Appendix II: Pyranometer Classification According to WMO Guide 1996

Characteristics

CMP 22

CMP 21

CMP 11

CMP 6

High

quality

Good

quality

Moderate

quality

ISO 9060 classification

Secondary

Standard

Secondary

Standard

Secondary

Standard

First

Class

Secondary

Standard

First

Class

Second

Class

Response time (95 percent

response)

5 s

5 s

5 s

18 s

< 15 s

< 30 s

< 60 s

Zero offset:

(a) Response to 200 W/m

2

net thermal radiation

(ventilated)

(b) Response 5 K/h change

in ambient temperature

± 3 W/m

2

± 1 W/m

2

± 7 W/m

2

± 2 W/m

2

± 7 W/m

2

± 2 W/m

2

± 15 W/m

2

± 4 W/m

2

± 7 W/m

2

± 2 W/m

2

± 15 W/m

2

± 4 W/m

2

± 30 W/m

2

± 8 W/m

2

Resolution (smallest detectable

change)

± 1 W/m

2

± 1 W/m

2

± 1 W/m

2

± 1 W/m

2

± 1 W/m

2

± 5 W/m

2

± 10 W/m

2

Stability (change per year,

percentage of full scale)

< 0.5

< 0.5

< 0.5

< 1

± 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

2

)

± 5 W/m

2

± 10 W/m

2

± 10 W/m

2

± 20 W/m

2

± 10 W/m

2

± 20 W/m

2

± 30 W/m

2

Temperature response (percentage

of maximum due to any change of

ambient temperature within an

interval of 50 K)

± 0.5

-20

0

C-+50

0

C

± 1

-20

0

C-+50

0

C

± 1

-10

0

C-+40

0

C

± 4

-10

0

C-+40

0

C

± 2

± 4

± 8

Non-linearity (percentage deviation

from the responsivity at 500 W/m

2

due to any change of irradiance

within the range 100 to 1000 W/m

2

)

± 0.2

± 0.2

± 0.2

± 1

± 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

2

irradiance)

± 0.2

± 0.2

± 0.2

± 1

± 0.5

± 2

± 5

Achievable uncertainty, 95 percent

confidence level

Hourly totals

Daily totals

1 %

2 %

2 %

5 %

3%

2%

8%

5%

20%

10%

1 2 ... 21 22 23 24 25 26 27 28 29

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