	SU-200-SS	SU-202-SS	SU-205-SS	SU-220	SU-221-SS	SU-300-SS	SU-321-SS
Power Supply	Self-powered	5 to 24 V DC	5.5 to 24 V DC	-	5.5 to 24 V DC	Self-powered	5.5 to 24 V DC
Output (Sensitivity)	0.1 mV per W m^-2; 0.03 mV per µmol m^-2 s^-1	25 mV per W m^-2; 8.33 mV per µmol m^-2 s^-1	50 mV per W m^-2; 16.67 mV per µmol m^-2 s^-1	-	-	0.1 mV per UV Index unit	-
Resolution	-	-	-	0.1 µmol m^-2 s^-1	-	-	-
Calibration Factor (reciprocal of sensitivity)	10 W m^-2 per mV; 30 µmol m^-2 s^-1 per mV	0.04 W m^-2 per mV; 0.12 µmol m^-2 s^-1 per mV	0.02 W m^-2 per mV; 0.06 µmol m^-2 s^-1 per mV	Custom for each sensor and stored in the firmware	Custom for each sensor and stored in the firmware	10 UV Index units per mV	Custom for each sensor and stored in the firmware
Calibration Uncertainty	± 5 %	± 5 %	± 5 %	± 5 %	± 5 %	± 10 %	± 10 %
Output Range	0 to 10 mV	0 to 2.5 V	0 to 5 V	USB	SDI-12	0 to 2 mV	SDI-12
Measurement Range	0 to 100 W m^-2	0 to 100 W m^-2	0 to 100 W m^-2	0 to 100 W m^-2	0 to 100 W m^-2	0 to 20 UV Index	0 to 20 UV Index
Measurement Repeatability	Less than 0.5 %	Less than 0.5 %	Less than 0.5 %	Less than 0.5 %	Less than 0.5 %	Less than 0.5 %	Less than 0.5 %
Long-term Drift (Non-stability)	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 %	Less than 1 %	Less than 1 %	Less than 1 %	Less than 1 %	Less than 1 %	Less than 1 %
Response Time	Less than 1 ms	Less than 1 ms	Less than 1 ms	Less than 1 ms	Less than 0.6 s	Less than 1 ms	Less than 0.6 s
Field of View	180°	180°	180°	180°	180°	180°	180°
Spectral Range	305 to 390 nm	305 to 390 nm	305 to 390 nm	305 to 390 nm	305 to 390 nm	270 to 315 nm	270 to 315 nm
Directional (Cosine) Response	± 2 % at 45°; ± 5 % at 75° zenith angle	± 2 % at 45°; ± 5 % at 75° zenith angle	± 2 % at 45°; ± 5 % at 75° zenith angle	± 2 % at 45°; ± 5 % at 75° zenith angle	± 2 % at 45°; ± 5 % at 75° zenith angle	± 2 % at 45°; ± 5 % at 75° zenith angle	± 2 % at 45°; ± 5 % at 75° zenith angle
Temperature Response	Less than 0.1 % per C	Less than 0.1 % per C	Less than 0.1 % per C	Less than 0.1 % per C	Less than 0.1 % per C	Less than 0.1 % per C	Less than 0.1 % per C
Operating Environment	-30 to 85 C, 0 to 100 % relative humidity	-30 to 85 C, 0 to 100 % relative humidity	-30 to 85 C, 0 to 100 % relative humidity	-30 to 85 C, 0 to 100 % relative humidity	-30 to 85 C, 0 to 100 % relative humidity	-30 to 85 C, 0 to 100 % relative humidity	-30 to 85 C, 0 to 100 % relative humidity
Dimensions	30.5 mm diameter, 37 mm height	30.5 mm diameter, 37 mm height	30.5 mm diameter, 37 mm height	30.5 mm diameter, 37 mm height	30.5 mm diameter, 37 mm height	30.5 mm diameter, 37 mm height	30.5 mm diameter, 37 mm height
Mass (with 5 m of cable)	140 g	140 g	140 g	140 g	140 g	140 g	140 g
Warranty	4 years against defects in materials and workmanship	4 years against defects in materials and workmanship	4 years against defects in materials and workmanship	4 years against defects in materials and workmanship	4 years against defects in materials and workmanship	4 years against defects in materials and workmanship	4 years against defects in materials and workmanship