Apogee S2-122 Owner's Manual - Page 6

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Apogee S2-122 Owner's Manual

SPECIFICATIONS

Power Supply
Output (sensitivity)**
Calibration Factor
(reciprocal of sensitivity)**
Calibration Uncertainty
Output Range**
Wavelength Ranges
Measurement Range
Measurement Repeatability
Long-term Drift
(Non-stability)
Response Time
Field of View
Directional (Cosine)
Response
Temperature Response
Housing
IP Rating
Operating Environment
Dimensions
Mass (with 5 m of cable)
Cable
*FWHM = full-width half-maximum
** The Output (sensitivity), Calibration Factor (reciprocal of sensitivity), and Output Range are all approximations and variable from
sensor to sensor
Calibration Traceability
Apogee S2 series PRI sensors are calibrated through side-by-side comparison to the mean of three transfer
standard sensors under sunlight. The transfer standard PRI sensors are calibrated through side-by-side comparison
to the mean of six replicate direct and diffuse solar spectra collected in Logan, Utah, using an Apogee PS-300
spectroradiometer. The Apogee PS-300 spectroradiometer is calibrated with a quartz halogen lamp traceable to
the National Institute of Standards and Technology (NIST).
S2-121
(upward-looking)
2 mV per W m⁻² (Green)
2 mV per W m⁻² (Yellow)
0.5 W m⁻² per mV (Green)
0.5 W m⁻² per mV (Yellow)
6 mV (Green)
6 mV (Yellow)
Green detector = 532 nm with 10 nm FWHM* ± 3 nm
Yellow detector = 570 nm with 10 nm FWHM* ± 3 nm
180°
Anodized aluminum body with acrylic diffuser
30.5 mm diameter,
37 mm height
140 g
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
PRI
Self-powered
± 10 %
2x full sunlight
Less than 1 %
Less than 2 % per year
Less than 1 ms
± 2 % at 45°; ± 5 % at 75° zenith angle
Less than 0.1 % per C
IP68
-40 to 70 C; 0 to 100 % relative humidity
S2-122
(downward-looking)
10 mV per W m⁻² (Green)
10 mV per W m⁻² (Yellow)
0.1 W m⁻² per mV (Green)
0.1 W m⁻² per mV (Yellow)
10 mV (Green)
10 mV (Yellow)
35°
23.5 mm diameter,
43 mm height
110 g