	S2-111-SS	S2-112-SS	S2-411-SS	S2-412-SS
Power Supply	Self-powered	Self-powered	5.5 to 24 V DC	5.5 to 24 V DC
Output (sensitivity)	14 mV per W m^-2 (Red) 20 mV per W m^-2 (NIR)	12.5 mV per W m^-2 nm^-1 sr^-1 (Red) 25 mV per W m^-2 nm^-1 sr^-1 (NIR)	-	-
Calibration Factor (recipricol of sensitivity)	0.07 W m^-2 nm^-1 per mV (Red) 0.05 W m^-2 nm^-1 per mV (NIR)	0.08 W m^-2 nm^-1 sr^-1 per mV (Red) 0.04 W m^-2 nm^-1 sr^-1 per mV (NIR)	Custom for each sensor and stored in firmware	Custom for each sensor and stored in firmware
Calibration Uncertainty	± 5 %	± 5 %	± 5 %	± 5 %
Output Range	40 mV (Red) 40 mV (NIR)	15 mV (Red) 15 mV (NIR)	SDI-12	SDI-12
Wavelength Ranges	Red detector = 650 nm ± 5 nm with 65 nm FWHM* NIR detector = 810 nm ± 5 nm with 65 nm FWHM*	Red detector = 650 nm ± 5 nm with 65 nm FWHM* NIR detector = 810 nm ± 5 nm with 65 nm FWHM*	Red detector = 650 nm ± 5 nm with 65 nm FWHM* NIR detector = 810 nm ± 5 nm with 65 nm FWHM*	Red detector = 650 nm ± 5 nm with 65 nm FWHM* NIR detector = 810 nm ± 5 nm with 65 nm FWHM*
Measurement Range	2x full sunlight	2x full sunlight	2x full sunlight	2x full sunlight
Measurement Repeatability	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
Response Time	Less than 1 ms	Less than 1 ms	Less than 0.6 s	Less than 0.6 s
Field of View	180°	30°	180°	30°
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
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
Housing	Anodized aluminum body with acrylic diffuser	Anodized aluminum body with acrylic window	Anodized aluminum body with acrylic diffuser	Anodized aluminum body with acrylic window
IP Rating	IP68	IP68	IP68	IP68
Operating Environment	-40 to 70 C; 0 to 100 % relative humidity	-40 to 70 C; 0 to 100 % relative humidity	-40 to 70 C; 0 to 100 % relative humidity	-40 to 70 C; 0 to 100 % relative humidity
Dimensions	30.5 mm diameter, 37 mm height	30.5 mm diameter, 34.5 mm height	30.5 mm diameter, 37 mm height	30.5 mm diameter, 34.5 mm height
Mass (with 5 m of cable)	140 g	140 g	140 g	140 g
Cable	5 m of shielded, twisted-pair wire with TPR jacket and stainless steel connector	5 m of shielded, twisted-pair wire with TPR jacket and stainless steel connector	5 m of shielded, twisted-pair wire with TPR jacket and stainless steel connector	5 m of shielded, twisted-pair wire with TPR jacket and stainless steel connector
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

S2-111-SS

S2-112-SS

S2-411-SS

S2-412-SS

Power Supply

Self-powered

5.5 to 24 V DC

Output (sensitivity)

14 mV per W m^-2 (Red)
20 mV per W m^-2 (NIR)

12.5 mV per W m^-2 nm^-1 sr^-1 (Red)
25 mV per W m^-2 nm^-1 sr^-1 (NIR)

Calibration Factor (recipricol of sensitivity)

0.07 W m^-2 nm^-1 per mV (Red)
0.05 W m^-2 nm^-1 per mV (NIR)