Net Radiometer

	SN-500
Input Voltage Range	5.5 to 16 V DC (heaters are optimized to run at 12 V DC)
Current Draw (12 V DC Supply Voltage)	Heaters on, communication enabled: 63 mA; Heaters off, communication enabled: 1.5 mA; Heaters off, communication disabled: 0.6 mA
Response Time (using SDI-12 Protocol)	1 s (SDI-12 data transfer rate; detector response times are 0.5 s)
Heaters (sensors individually heated)	62 mA current draw and 740 mW power requirement at 12 V DC
Operating Environment	-50 to 80 C; 0 to 100 % relative humidity
Dimensions	116 mm length, 45 mm width, 66 mm height
Mass	320 g (with mounting rod and 5 m of lead wire)
Cable	M8 connector (IP68 rating) to interface to sensor housing; 5 m of four conductor, shielded, twisted-pair wire in a TPR jacket; pigtail lead wires
Pyrgeometer Specifications
Sensitivity	0.12 mV per W m^-2 (variable from sensor to sensor, typical value listed)
Calibration Factor (Reciprocal of Sensitivity)	8.5 W m^-2 (variable from sensor to sensor, typical value listed)
Calibration Uncertainty	± 5 %
Output Ranges	-24 to 24 mV
Measurement Range	-200 to 200 W m^-2 (net longwave irradiance)
Measurement Repeatability	Less than 1 %
Long-term Drift	Less than 2 % change in sensitivity per year
Non-linearity	Less than 1 %
Detector Response Time	Less than 0.5 s
Field of View	150°
Spectral Range	5 to 30 µm
Temperature Response	Less than 5 % from -15 to 45 C
Window Heating Offset	Less than 10 W m^-2
Zero Offset B	Less than 5 W m^-2
Tilt Error	Less than 0.5 %
Uncertainty in Daily Total	± 5 %
Temperature Sensor	30 kΩ thermistor, ± 1 C tolerance at 25 C
Output from Thermistor	0 to 2500 mV (typical, other voltages can be used)
Input Voltage Requirement for Thermistor	2500 mV excitation (typical, other voltages can be used)
Pyranometer Specifications
Sensitivity	0.057 mV per W m^-2 (upward-looking); 0.15 mV per W m^-2 (downward-looking); (variable from sensor to sensor, typical values listed)
Calibration Factor (Reciprocal of Sensitivity)	17.5 W m^-2 per mV (upward-looking); 6.7 W m^-2 per mV (downward-looking); (variable from sensor to sensor, typical values listed)
Calibration Uncertainty	± 5 %
Output Range	0 to 114 mV (upward-looking); 0 to 300 mV (downward-looking)
Measurement Range	0 to 2000 W m^-2 (net shortwave irradiance)
Measurement Repeatability	Less than 1 %
Long-term Drift	Less than 2 % per year
Non-linearity	Less than 1 %
Detector Response Time	0.5 s
Field of View	180° (upward-looking); 150° (downward-looking)
Spectral Range	385 nm to 2105 nm (upward-looking), 295 nm to 2685 nm (downward-looking); (50 % points)
Directional (Cosine) Response	Less than 30 W m^-2 at 80° solar zenith (upward-looking); Less than 20 % for angles between 0 and 60° (downward-looking)
Temperature Response	Less than 5 % from -15 to 45 C
Zero Offset A	Less than 5 W m^-2; less than 10 W m^-2 (heated)
Zero Offset B	Less than 5 W m^-2
Uncertainty in Daily Total	Less than 5 %

Input Voltage Range

5.5 to 16 V DC (heaters are optimized to run at 12 V DC)

Current Draw (12 V DC Supply Voltage)

Heaters on, communication enabled: 63 mA; Heaters off, communication enabled: 1.5 mA; Heaters off, communication disabled: 0.6 mA

Response Time (using SDI-12 Protocol)

1 s (SDI-12 data transfer rate; detector response times are 0.5 s)

Heaters (sensors individually heated)

62 mA current draw and 740 mW power requirement at 12 V DC

Operating Environment

-50 to 80 C; 0 to 100 % relative humidity

Dimensions

116 mm length, 45 mm width, 66 mm height

Mass

320 g (with mounting rod and 5 m of lead wire)

Cable

M8 connector (IP68 rating) to interface to sensor housing; 5 m of four conductor, shielded, twisted-pair wire in a TPR jacket; pigtail lead wires

Pyrgeometer Specifications

Sensitivity

0.12 mV per W m^-2 (variable from sensor to sensor, typical value listed)

Calibration Factor (Reciprocal of Sensitivity)

8.5 W m^-2 (variable from sensor to sensor, typical value listed)

Calibration Uncertainty

± 5 %

Output Ranges

-24 to 24 mV

Measurement Range

-200 to 200 W m^-2 (net longwave irradiance)

Measurement Repeatability

Less than 1 %

Long-term Drift

Less than 2 % change in sensitivity per year

Non-linearity

Less than 1 %

Detector Response Time

Less than 0.5 s

Field of View

150°

Spectral Range

5 to 30 µm

Temperature Response

Less than 5 % from -15 to 45 C

Window Heating Offset

Less than 10 W m^-2

Zero Offset B

Less than 5 W m^-2

Tilt Error

Less than 0.5 %

Uncertainty in Daily Total

± 5 %

Temperature Sensor

30 kΩ thermistor, ± 1 C tolerance at 25 C

Output from Thermistor

0 to 2500 mV (typical, other voltages can be used)

Input Voltage Requirement for Thermistor

2500 mV excitation (typical, other voltages can be used)

Pyranometer Specifications

Sensitivity

0.057 mV per W m^-2 (upward-looking); 0.15 mV per W m^-2 (downward-looking); (variable from sensor to sensor, typical values listed)

Calibration Factor (Reciprocal of Sensitivity)

17.5 W m^-2 per mV (upward-looking); 6.7 W m^-2 per mV (downward-looking); (variable from sensor to sensor, typical values listed)

Calibration Uncertainty

± 5 %

Output Range

0 to 114 mV (upward-looking); 0 to 300 mV (downward-looking)

Measurement Range

0 to 2000 W m^-2 (net shortwave irradiance)

Measurement Repeatability

Less than 1 %

Long-term Drift

Less than 2 % per year

Non-linearity

Less than 1 %

Detector Response Time

0.5 s

Field of View

180° (upward-looking); 150° (downward-looking)

Spectral Range

385 nm to 2105 nm (upward-looking), 295 nm to 2685 nm (downward-looking); (50 % points)

Directional (Cosine) Response

Less than 30 W m^-2 at 80° solar zenith (upward-looking); Less than 20 % for angles between 0 and 60° (downward-looking)

Temperature Response

Less than 5 % from -15 to 45 C

Zero Offset A

Less than 5 W m^-2; less than 10 W m^-2 (heated)

Zero Offset B

Less than 5 W m^-2

Uncertainty in Daily Total

Less than 5 %

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