Apogee Instruments S2-441 Owner's Manual - Page 6

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SPECIFICATIONS

Power Supply

Average Max Current Draw

Calibration Factor (reciprocal

of sensitivity)

Calibration Uncertainty

Output Range

Measurement Repeatability

Long-term Drift

Non-linearity

Field of View

Spectral Ranges

Directional (Cosine) Response

Temperature Response

Housing

IP Rating

Operating Environment

Dimensions

Mass (with 5 m of cable)

Cable

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).

RS-485 quiescent 37 mA, active 42 mA

Custom for each sensor and stored in firmware

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

S2-442

5.5 to 24 V DC

RS-232 37 mA;

± 5 %

Modbus

Less than 1 %

Less than 2 % per year

180°

389 to 692 nm ± 5 nm (PAR)

700 to 760 nm ± 5 nm (Far-red)

Less than 0.1 % per C

IP68

140 g