7
2 Instrument schematic
sun[e]’s scientific name is pyranometer. A pyranometer measures the solar radiation received by a
plane surface from a 180 ° field of view angle. This quantity, expressed in W/m
2
, is called
“hemispherical” solar radiation.
The solar radiation spectrum extends roughly from 285 to 3000 x 10
-9
m. By definition a pyranometer
should cover that spectral range with a spectral selectivity that is as “flat” as possible.
Figure 2.0.1
Overview of sun[e]:
(1)
cable (standard length 5 metres, optional longer cable)
(2)
connector
(3)
sun screen
(4)
bubble level
(5)
bubble level window
(6)
outer dome
(7)
inner dome
(8)
thermal sensor with black coating
(9)
internal ventilation vents
(10)
quick release system of sun screen
(11)
instrument body
(12)
levelling feet
sun[e] pyranometer employs a state-of-the-art thermopile sensor with black coated surface, two
domes and an anodised aluminium body. sun[e] offers a digital output via Modbus RTU over 2-wire
RS-485. The pyranometer dome is heated by ventilating the area between the inner and outer dome
using RVH
TM
- Recirculating Ventilation and Heating - technology.
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