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Directional response 5 W m

-2

for beam radiation

Quartz domes Infrasil II

B 2.5 Carter-Scott Middleton EP09 Pyranometer

The EP09 sensor has an upwards facing black receiver disk with a radial heat conduction path for rapid

response. An identical (reference) disk faces into the instrument body. The temperature difference between

the disks is a direct function of the intensity of radiation absorbed by the receiver disk. The disk temperature

is precisely determined with miniature thin-film Platinum Resistance Elements which give the instrument

exceptional linearity and stability. Zero offset and signal gain can be externally trimmed via access holes

in the base.

Specifications

Response Time < 10s

time for 95% response

Zero off-set

a) response to 200 W m + 6 W m

-2 -2

net thermal radiation (Ventilated)

b) response to 5 C/hour change < 2 W m

o-2

in ambient temperature

Non-stability < -0.6 %

Percentage change in

responsivity per year

Non-linearity < ± 0.25 %

percentage deviation from the

responsivity at 500 W m due

-2

to change in irradiance

within 100 W m to 1000 W m

-2 -2

Directional response for

beam radiation from 0 to 85 < ± 10 W m

o-2

Spectral Selectivity +0.5 %, -1.5 %

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 < ± 0.1 %

percentage deviation from the

responsivity at 00 tilt (horizontal)

due to change in tilt from 0° to 90°

at 1000 W m irradiance

-2

Temperature response < 1 %

percentage deviation due to change

in ambient temperature within an

interval of 50 C

Field of view 2 B sr

Irradiance 0 - 2000 W m

-2

Spectral range 300 - 3000 nm (nominal)

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 187 188

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