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SPECIFICATIONS
Power Supply
*Output (sensitivity)
*Calibration Factor
(reciprocal of sensitivity)
Calibration Uncertainty
*Output Range
Measurement Repeatability
Long-term Drift
Non-linearity
Response Time
Field of View
Spectral Ranges
Directional (Cosine) Response
Temperature Response
Housing
IP Rating
Operating Environment
Dimensions
Mass (with 5 m of cable)
Cable
*The Output, Calibration Factor, and Output Range are variable from sensor to sensor, and the specifications listed are
typical values.
Calibration Traceability
The PAR sensor in Apogee S2 series PAR-FAR sensors are calibrated through side-by-side comparison to the mean
of four transfer standard quantum sensors under a reference lamp. The transfer standard quantum sensors are
calibrated with a quartz halogen lamp traceable to the National Institute of Standards and Technology (NIST).
The far-red sensor in Apogee S2 series PAR-FAR sensors are calibrated through side-by-side comparison to the
mean photon flux density of four transfer standard far-red radiometers under far-red LEDs (735 nm peak, 710-760
nm range). The transfer standard far-red sensors are calibrated against a spectroradiometer (Apogee Instruments
model PS-300) under the same far-red LEDs. The spectroradiometer is calibrated with a quartz halogen lamp
traceable to the National Institute of Standards and Technology (NIST).
0.02 mV per µmol m⁻² s⁻¹ (Far-red)
50 µmol m⁻² s⁻¹ per mV (Far-red)
Less than 1 % (up to 4000 µmol m⁻² s⁻¹) (PAR)
Less than 1 % (up to 1000 µmol m⁻² s⁻¹) (Far-red)
± 2 % at 45°; ± 5 % at 75° zenith angle
Anodized aluminum body with acrylic diffuser
-40 to 70 C; 0 to 100 % relative humidity
30.5 mm diameter, 37 mm height
5 m of shielded, twisted-pair wire; TPR jacket (high water resistance, high UV stability,
flexibility in cold conditions); pigtail lead wires; stainless steel (316), M8 connector
S2-141
Self-powered
0.01 mV per µmol m⁻² s⁻¹ (PAR)
100 µmol m⁻² s⁻¹ per mV (PAR)
± 5 %
0 to 40 mV (PAR)
0 to 20 mV (Far-red)
Less than 1 %
Less than 2 % per year
Less than 1 ms
180°
389 to 692 nm ± 5 nm (PAR)
702 to 761 nm ± 5 nm (Far-red)
Less than 0.1 % per C
IP68
140 g