Apogee Instruments S2-111 Manuale d'uso - Pagina 6
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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)
5 m of shielded, twisted-pair wire; TPR jacket (high water resistance, high UV stability, flexibility in cold conditions);
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 NDVI sensors are calibrated through side-by-side comparison to the mean of three transfer
standard sensors under sunlight. The transfer standard NDVI 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).
S2-111
(upward-looking)
14 mV per W m⁻² (Red)
20 mV per W m⁻² (NIR)
-1
0.07 W m⁻² nm
per mV (Red)
0.05 W m⁻² nm
-1
per mV (NIR)
40 mV (Red)
40 mV (NIR)
Red detector = 650 nm ± 5 nm with 65 nm FWHM*
NIR detector = 810 nm ± 5 nm with 65 nm FWHM*
180°
± 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
pigtail lead wires; stainless steel (316), M8 connector
NDVI
Self-powered
12.5 mV per W m⁻² nm
25 mV per W m⁻² nm
0.08 W m⁻² nm
0.04 W m⁻² nm
± 5 %
2x full sunlight
Less than 1 %
Less than 2 % per year
Less than 1 ms
Less than 0.1 % per C
IP68
140 g
S2-112
(downward-looking)
-1
-1
sr
(Red)
-1
sr
-1
(NIR)
-1
-1
sr
per mV (Red)
-1
sr
-1
per mV (NIR)
15 mV (Red)
15 mV (NIR)
30°
30.5 mm diameter,
34.5 mm height