	SP-510-SS Upward-looking	SP-610-SS Downward-looking	SP-522-SS Upward-looking
ISO 9060:2018	Class C (fast response)	N/A	Class C (fast response)
Sensitivity (variable from sensor to sensor, typical values listed)	0.045 mV per W m^-2	0.035 mV per W m^-2	-
Calibration Factor (reciprocal of sensitivity; variable from sensor to sensor, typical values listed)	22 W m^-2 per mV	28.5 W m^-2 per mV	-
Input Voltage Requirement	-	-	5.5 to 24 V
Calibration Uncertainty at 1000 W m^-2	Less than 3 %	Less than 3 %	Less than 3 %
Output Range	0 to 90 mV	0 to 70 mV	Modbus
Measurement Range	0 to 2000 W m^-2 (net shortwave irradiance)	0 to 2000 W m^-2 (net shortwave irradiance)	0 to 2000 W m^-2 (net shortwave irradiance)
Measurement Repeatability	Less than 1 %	Less than 1 %	Less than 1 %
Long-term Drift	Less than 2 % per year	Less than 2 % per year	Less than 2 % per year
Non-linearity	Less than 1 %	Less than 1 %	Less than 1 %
Detector Response Time	0.5 s	0.5 s	0.5 s (baudrate dependent)
Field of View	180°	150°	180°
Spectral Range (50 % points)	385 to 2105 nm	370 to 2240 nm	385 to 2105 nm
Directional (Cosine) Response	Less than 30 W m^-2 at 80° solar zenith	Less than 20 W m^-2 for angles between 0 to 60°	Less than 30 W m^-2 at 80° solar zenith
Temperature Response	Less than 5 % from -15 to 45 C	Less than 5 % from -15 to 45 C	Less than 5 % from -15 to 45 C
Zero Offset A	Less than 2 W m^-2; Less than 10 W m^-2 (heated)	Less than 2 W m^-2; Less than 10 W m^-2 (heated)	Less than 2 W m^-2; Less than 10 W m^-2 (heated)
Zero Offset B	Less than 5 W m^-2	Less than 5 W m^-2	Less than 5 W m^-2
Operating Environment	-50 to 80 C; 0 to 100 % relative humidity	-50 to 80 C; 0 to 100 % relative humidity	-50 to 80 C; 0 to 100 % relative humidity
Heater	780 Ω, 15.4 mA current draw and 185 mW power requirement at 12 V DC	780 Ω, 15.4 mA current draw and 185 mW power requirement at 12 V DC	4 mA (heater off); 30 mA (heater on)
Uncertainty in Daily Total	Less than 5 %	Less than 5 %	Less than 5 %
Dimensions	23.5 mm diameter, 28.7 mm height	23.5 mm diameter, 27.5 mm height	30.5 mm diameter, 37 mm height
Mass (with 5 m of cable)	90 g	100 g	140 g

SP-510-SS
Upward-looking

SP-610-SS
Downward-looking

SP-522-SS
Upward-looking

ISO 9060:2018

Class C (fast response)

N/A

Class C (fast response)

Sensitivity (variable from sensor to sensor, typical values listed)

0.045 mV per W m^-2

0.035 mV per W m^-2

Calibration Factor (reciprocal of sensitivity; variable from sensor to sensor, typical values listed)

22 W m^-2 per mV