Apogee Instruments S2-412 Посібник користувача - Сторінка 6
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SPECIFICATIONS
Calibration Factor
(reciprocal of
sensitivity)**
Calibration Uncertainty
Output Range**
Power Supply
Wavelength Ranges
Measurement Range
Measurement
Repeatability
Long-term Drift
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 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 a quartz halogen lamp. 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).
S2-411-SS
(upward-looking)
Custom for each sensor and stored in firmware
Red detector = 650 nm with 10 nm FWHM*
NIR detector = 810 nm with 10 nm FWHM*
180°
Anodized aluminum body with acrylic diffuser
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
NDVI
± 5 %
SDI-12
5.5 to 24 V DC
2x full sunlight
Less than 1 %
Less than 2 % per year
Less than 0.6 s
± 2 % at 45°, ± 5 % at 75° zenith angle
Less than 0.1 % per C
IP68
-40 to 70 C; 0 to 100 % relative humidity
140 g
S2-412-SS
(downward-looking)
30°
30.5 mm diameter,
34.5 mm height