	SP-110-SS	SP-212-SS	SP-214-SS	SP-215-SS	SP-230-SS	SP-420	SP-421-SS	SP-422-SS
ISO 9060:2018	Class C (fast response)	Class C (fast response)	Class C (fast response)	Class C (fast response)	Class C (fast response)	Class C (fast response)	Class C (fast response)	Class C (fast response)
Power Supply	Self-powered	5 to 24 V DC	7 to 24 V DC	5.5 to 24 V DC	12 V DC for heater	5 V	5.5 to 24 V DC	5.5 to 24 V DC
Current Draw	-	300 µA	22 mA maximum; 2 mA quiescent	300 µA	15.4 mA	61 mA when logging	1.5 mA (quiescent); 1.9 mA (active)	RS-232 37 mA; RS-485 quiescent 37 mA, active 42 mA
Output (Sensitivity)	0.2 mV per W m^-2	1.25 mV per W m^-2	0.008 mA per W m^-2	2.5 mV per W m^-2	0.2 mV per W m^-2	-	-	-
Output Type	0 to 400 mV	0 to 2.5 V	4 to 20 mA	0 to 5 V	0 to 400 mV	USB	SDI-12	Modbus
Resolution	-	-	-	-	-	0.1 W m^-2	-	-
Calibration Factor (Reciprocal of Output)	5 W m^-2 per mV	0.8 W m^-2 per mV	125 W m^-2 per mA, 4 mA offset	0.4 W m^-2 per mV	5 W m^-2 per mV	Custom for each sensor and stored in the firmware	Custom for each sensor and stored in the firmware	Custom for each sensor and stored in the firmware
Calibration Uncertainty at 1000 W m^-2	Less than 3 %	Less than 3 %	Less than 3 %	Less than 3 %	Less than 3 %	Less than 3 %	Less than 3 %	Less than 3 %
Measurement Repeatability	Less than 1 %	Less than 1 %	Less than 1 %	Less than 1 %	Less than 1 %	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	Less than 2 % per year	Less than 2 % per year	Less than 2 % per year	Less than 2 % per year	Less than 2 % per year
Non-linearity	Less than 1 % up to 2000 W m^-2	Less than 1 % up to 2000 W m^-2	Less than 1 % up to 2000 W m^-2	Less than 1 % up to 2000 W m^-2	Less than 1 % up to 2000 W m^-2	Less than 1 % up to 2000 W m^-2	Less than 1 % up to 2000 W m^-2	Less than 1 % up to 2000 W m^-2
Response Time	Less than 1 ms	Less than 1 ms	Less than 1 ms	Less than 1 ms	Less than 1 ms	Software updates every second	Less than 0.6 s	Less than 200 ms
Field of View	180°	180°	180°	180°	180°	180°	180°	180°
Spectral Range	360 to 1120 nm	360 to 1120 nm	360 to 1120 nm	360 to 1120 nm	360 to 1120 nm	360 to 1120 nm	360 to 1120 nm	360 to 1120 nm
Directional (Cosine) Response	± 5 % at 75° zenith angle	± 5 % at 75° zenith angle	± 5 % at 75° zenith angle	± 5 % at 75° zenith angle	± 5 % at 75° zenith angle	± 5 % at 75° zenith angle	± 5 % at 75° zenith angle	± 5 % at 75° zenith angle
Temperature Response	0.04 ± 0.04 % per C	0.04 ± 0.04 % per C	0.04 ± 0.04 % per C	0.04 ± 0.04 % per C	0.04 ± 0.04 % per C	0.04 ± 0.04 % per C	0.04 ± 0.04 % per C	0.04 ± 0.04 % per C
Operating Environment	-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m	-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m	-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m	-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m	-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m	-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m	-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m	-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m
Dimensions	24 mm diameter, 33 mm height	30.5 mm diameter, 37 mm height	30.5 mm diameter, 37 mm height	30.5 mm diameter, 37 mm height	24 mm diameter, 33 mm height	24 mm diameter, 33 mm height	30.5 mm diameter, 37 mm height	30.5 mm diameter, 37 mm height
Mass (with 5 m of cable)	90 g	140 g	140 g	140 g	90 g	90 g	140 g	140 g