Kippzonen BSRN Scientific Solar Monitoring System Manual do Utilizador descarregar pdf (Página 105)

(bubble half out of the ring)

Coincident with base of the instrument.

Detector surface and base are coplanar within 0.1°

Materials Anodized aluminium case. Stainless steel screws in stainless

steel bushes. White plastic screen of ASA

Drying cartridge PMMA

Weight 830 g

Cable length 10 m (standard)

Dimensions 91.5 mm total height, 150 mm diameter, 25 mm dome height,

50 mm dome diameter

B 2.3 Kipp & Zonen Delft BV CM21/31 Pyranometers

Suitable for the measurement of solar irradiance on a plane surface.

- improved specifications in comparison with the CM11.

- also available with quartz domes (CM31) yielding a broader range and reduced offsets.

Essentially the pyranometer CM21 has the same characteristics as the CM11. Some of these specifications

have been improved:

Sensitivity

Impedance

Temperature response

Non-linearity

Response time

Specifications

Response time < 5 s

time for 95 % response

Zero off-set

a) response to 200 W m net + 7 W m

-2 -2

thermal radiation (ventilated)

b) response to 5 K h change ± 2 W m

-1 -2

in ambient temperature

Non-stability ± 0.5 %

percentage change in

responsivity per year

Non-linearity ± 0.25 %

percentage deviation from the

responsivity at 500 W m due

-2

to the change in irradiance

within 100 W m to 1000 W m

-2 -2

Directional response for beam ± 10 W m

-2

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

irradiation is 1000 W m

-2

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Kippzonen BSRN Scientific Solar Monitoring System Manual do Utilizador Página 105

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