NR01 Four-Component Net Radiation Sensor
5
TABLE 5-2. Pyranometer Specifications
Sensor
Hukseflux’s thermopile pyranometer
Overall classification according to
ISO 9060 / WMO
Second class pyranometer
Response time for 95 % response
18 s
Zero offset a (response to 200
W/m
2
net thermal radiation)
< 15 W/m
2
Zero offset b (response to 5 k/h
change in ambient temperature)
< 4 W/m
2
Non-stability
< 1% change per year
Non-Linearity
< ± 2.5%
Directional response for beam
radiation
Within ± 25 W/m
2
Spectral selectivity
± 5% (305 to 2000 nm)
Temperature response (within an
interval of 50 °C)
Within 6% (–10 to 40 °C)
Tilt response
Within ± 2%
Sensitivity
10 to 40 μV/Wm
-2
Expected voltage output
Application with natural solar radiation:
–0.1 to 50 mV
Sensor resistance
Between 40 and 60 Ohms (without
trimming)
Power required
Zero (passive sensor)
Range
To 2000 Wm
-2
Spectral range
305 to 2800 nm (50% transmission
points)
Required programming
Φ = U / E
Expected accuracy for daily sums
± 10%
Calibration traceability
To WRR, procedure according to ISO
9847
