	S2-141-SS*	S2-441-SS	S2-442-SS
Power Supply	Self-powered	5.5 to 24 V DC	5.5 to 24 V DC
电流消耗	-	1.4 mA (quiescent), 1.8 mA (active)	RS-232 37 mA; RS-485 quiescent 37 mA, active 42 mA
Output (Sensitivity)	0.01 mV per µmol m^-2s^-1(PAR) 0.02 mV per µmol m^-2s^-1(Far-red)	-	-
Calibration Factor (reciprocal of sensitivity)	100 µmol m^-2s^-1per mv (PAR) 50 µmol m^-2s^-1per mv (Far-red)	Custom for each sensor and stored in firmware	Custom for each sensor and stored in firmware
Calibration Uncertainty	± 5 %	± 5 %	± 5 %
Output Range	0 to 40 mV (PAR) 0 to 20 mV (Far-red)	SDI-12	Modbus
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 % (up to 4000 µmol m^-2s^-1) (PAR) Less than 1 % (up to 1000 µmol m^-2s^-1) (Far-red)	Less than 1 % (up to 4000 µmol m^-2s^-1) (PAR) Less than 1 % (up to 1000 µmol m^-2s^-1) (Far-red)	Less than 1 % (up to 4000 µmol m^-2s^-1) (PAR) Less than 1 % (up to 1000 µmol m^-2s^-1) (Far-red)
Response Time	Less than 1 ms	Less than 0.6 s	-
Field of View	180°	180°	180°
Spectral Ranges	389 to 692 nm ± 5 nm (PAR) 702 to 761 nm ± 5 nm (Far-red)	389 to 692 nm ± 5 nm (PAR) 702 to 761 nm ± 5 nm (Far-red)	389 to 692 nm ± 5 nm (PAR) 702 to 761 nm ± 5 nm (Far-red)
Directional (Cosine) Response	± 2 % at 45°; ± 5 % at 75°	± 2 % at 45°; ± 5 % at 75°	± 2 % at 45°; ± 5 % at 75°
Temperature Response	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 diffuser	Anodized aluminum body with acrylic diffuser
IP Rating	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
Dimensions	30.5 mm diameter, 37 mm height	30.5 mm diameter, 37 mm height	30.5 mm diameter, 37 mm height
电缆的质量(5米)	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

Power Supply

Self-powered

5.5 to 24 V DC

电流消耗

1.4 mA (quiescent), 1.8 mA (active)

RS-232 37 mA;
RS-485 quiescent 37 mA, active 42 mA

Output (Sensitivity)

0.01 mV per µmol m^-2s^-1(PAR)
0.02 mV per µmol m^-2s^-1(Far-red)

Calibration Factor (reciprocal of sensitivity)

100 µmol m^-2s^-1per mv (PAR)
50 µmol m^-2s^-1per mv (Far-red)

Custom for each sensor and stored in firmware

Calibration Uncertainty