CNR4 Net Radiometer
7
Cable length:
User defined
Weight
Sensor:
0.85 kg (1.89 lb) without cables
Heater/ventilator, CNF4
(optional):
0.50 kg (1.11 lb) without cables
Mounting rod:
34.7 cm (13.67 in) length
1.6 cm (0.63 in) diameter
6.2 Pyranometer Specifications
Spectral range:
305 to 2800 nm (50% points)
Sensitivity:
10 to 20 µV/W/m
2
Response time
1
:
< 18 seconds (95% response)
Non-linearity
1
:
< 1% (0 to 1000 W m
–2
irradiance)
Non-stability
1
:
< 1%
Temperature dependence of
sensitivity
1
:
< 4% (–10 to 40 °C)
Tilt response
1
:
< 1% at any angle with 1000 W/m
2
Directional error
1
:
< 20 W/m
2
at angle up to 80° with
1000 W/m
2
Zero offset due to 0 to -200 W/m
2
IR net irradiance
1
:
< 15 W/m
2
Zero offset due to temperature
change
1
:
< 3 W/m
2
(5 K/hr temperature change)
< 1 W/m
2
(with CNF4 installed)
Operating temperature:
–40 to 80 °C
Field of view
Upper detector:
Lower detector:
180°
150° (due to lower solar shield to
prevent illumination at low zenith
angles)
Maximum solar irradiance:
2000 W/m
2
Expected accuracy for daily totals:
±10 %
Typical signal output for
atmospheric application:
0 to 15 mV
Impedance:
20 to 200 Ω, typically 50
Ω
Detector:
Copper-constantan multi-junction
thermopile
Level accuracy:
1 degree
Irradiance:
0 to 2000 W/m
2
Spectral selectivity:
< 3% (330 to 1500 nm spectral
interval)