Kippzonen BSRN Scientific Solar Monitoring System Manual do Utilizador descarregar pdf (Página 116)

104

Compact size and light weight

Window is optical sapphire for chemical and scratch resistance

Marine-grade aluminium, hard anodised, for corrosion rsistance

The DN5 pyrheliometer has a twin-thermopile sensor embedded in a thermal-mass that is isolated from

the instrument body. Optical geometry, and baffling, is set by four precisely located apertures. The instrument

is easy to dismantle, and the window is simple to replace.

Specification

Response Time < 10s

time for 95% response

Zero off-set

response to 5 C/hour change < ± 1 W m

o-2

in ambient temperature

Non-stability < ± 1%

Percentage change in

responsivity per year

Non-linearity < ± 0.5 %

100 W m to 1000 W m

-2 -2

Spectral Selectivity ± 0.5 %

percentage deviation of the product

of spectral absorptance and spectral

transmittance from the corresponding

mean within 0,35 :m and 1,5 :m

Tilt response (at 1000 W m ) None

-2

Temperature response ± 1 %

percentage deviation due to change

in ambient temperature within an

interval of 50 C (-10 to +40°C)

Full opening angle 5

Slope angle 1

Limit angle 4

Irradiance 0 - 4000 W m

-2

Spectral Range (nominal) 200 - 5000 nm

Sensitivity (typical) 7 :V/W m (DN5)

-2

1 mV/W m (DN5-E)

-2

Calibration Accuracy ± 2 % (factory certificate); traceable NATA

Certificate available as extra cost option

Operating temperature -30 to +60 C

Output Impedence (DN5) 45 - 50 S

Power supply requirement (DN5-E) 5.5 to 14.5 VDC, 6mA

Standby mode (optional on DN5-E) Shutdown input: 2 to 14.5 V

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