Apogee Instruments S2-431 Посібник користувача - Сторінка 7
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SPECIFICATIONS
Power Supply
Current Draw
Calibration Factor
(reciprocal of sensitivity)
Calibration Uncertainty
Output Range
Measurement Repeatability
Long-term Drift
Non-linearity
Response Time
Field of View
Wavelength Ranges
Directional (Cosine)
Response
Temperature Response
Housing
IP Rating
Operating Environment
Dimensions
Mass (with 5 m of cable)
Cable
Calibration Traceability
Apogee S2 series Red - Far-red sensors are calibrated through side-by-side comparison to the mean of three
transfer standard sensors under a quartz halogen lamp. The transfer standard sensors are calibrated through side-
by-side comparison to red and far-red photon flux density calculated from solar spectra collected in Logan, Utah,
using an Apogee model PS-300 spectroradiometer. The PS-300 spectroradiometer is calibrated with a quartz
halogen lamp traceable to the National Institute of Standards and Technology (NIST).
Custom for each sensor and stored in firmware
0.6 s, time for detector signal to reach 95 % following a step change; fastest data transmission
Anodized aluminum body with acrylic diffuser
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
S2-431
5.5 to 24 V DC
1.8 mA (quiescent), 1.9 mA (active)
± 5 %
SDI-12
Less than 1 %
Less than 2 % per year
Less than 1 % (up to 400 µmol m⁻² s⁻¹)
rate for SDI-12 circuitry is 1 s.
180°
645 to 665 nm ± 5 nm (Red)
720 to 740 nm ± 5 nm (Far-red)
± 2 % at 45°; ± 5 % at 75° zenith angle
Less than 0.1 % per C
IP68
-40 to 70 C; 0 to 100 % relative humidity
30.5 mm diameter, 37 mm height
140 g