Kippzonen BSRN Scientific Solar Monitoring System Manual de usuario descargar pdf (Pagina 102)

Pyrheliometer Specification List

Specification Class of Pyrheliometer

Secondary

Standard

First Class Second Class

Response time: time for 95% response < 15 s < 20 s < 30 s

Zero off-set:

response to 5 K h change in ambient

-1

temperature

± 2 Wm ± 4 Wm ± 8 Wm

-2 -2 -2

Resolution (smallest detectable change in Wm ) ± 0.5 Wm ± 1 Wm ± 5 Wm

-2 -2 -2 -2

Stability (percentage of full scale, change/year) ± 0.5 % ± 1 % ± 2 %

Non-linearity:

percentage deviation from the responsivity

at 500 Wm due to change in irradiance within

-2

100 Wm to 1000 Wm

-2 -2

± 0.2 % ± 0.5 % ± 2 %

Spectral selectivity:

percentage deviation of the product of the

spectral absorptance and the spectral

transmittance from the corresponding mean

within 0.3 :m and 3.0 :m

± 0.5 % ± 1 % ± 5 %

Temperature response:

total percentage deviation due to change in

ambient temperature within in interval of 50 K

± 1 % ± 2 % ± 10 %

Tilt response:

percentage deviation form the responsivity at 0°

tilt (horizontal) due to change in tilt from 0° to

90°at 1000 Wm irradiance

-2

± 0.2 % ± 0.5 % ± 2 %

Traceability: maintained by periodic comparison with a primary

standard

pyrheliometer

with a

secondary

standard

pyrheliometer

with a first

class

pyrheliometer

or better

Table B 1.2. Pyrheliometer specification table from ISO 9060.

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 187 188

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Kippzonen BSRN Scientific Solar Monitoring System Manual de usuario Pagina 102

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