S2-431-SS SDI-12 Red - Far-red Sensor

The S2-431-SS Red - Far-red sensor is a two-channel digital sensor with SDI-12 communication protocol. The sensor features a rugged, aluminum housing that is fully-submersible and built to withst

  • Product Name:S2-431-SS SDI-12 Red - Far-red Sensor
  • Item No.:S2-431-SS
  • Manufacturers:Apogee
  • Country of Origin:USA

The S2-431-SS Red - Far-red sensor is a two-channel digital sensor with SDI-12 communication protocol. The sensor features a rugged, aluminum housing that is fully-submersible and built to withstand harsh conditions. The sensor cable includes an IP68 marine-grade stainless-steel cable connector to simplify sensor removal and replacement from permanent installations for maintenance and calibration. Typical applications include measuring the Red / Far-red ratio (RFR) for ecological applications, including the effect of spectral quality on phytochrome. The RF ratio influences plant height, leaf expansion rates, and other photobiology and plant morphogenic responses.

 


Power Supply:     5.5 to 24 V DC

Current Draw:     1.4 mA (quiescent), 1.8 mA (active)

Calibration Factor:     Custom for each sensor and stored in firmware

Calibration Uncertainty:     ± 5 %

Output Range:     SDI-12

Wavelength Ranges:     645 to 665 nm ± 5 nm (Red); 720 to 740 nm ± 5 nm (Far-Red)

Measurement Range:     0 to 400 µmol mˉ² sˉ¹ (Red and Far-Red)

Measurement Repeatability:     Less than 1 %

Long-term Drift:     Less than 2 % per year

Response Time:     Less than 0.6 s

Non-linearity:     Less than 1 % (up to 400 µmol mˉ² sˉ¹) (Red and Far-Red)

Field of View:     180°

Directional (Cosine) Response:     ± 2 % at 45˚, ± 5 % at 75˚ zenith angle

Temperature Response:     Less than 0.1 % per C

Housing:     Anodized aluminum body with acrylic diffuser

IP Rating:     IP68

Operating Environment:     -40 to 70 C; 0 to 100 % relative humidity

Dimensions:     30.5 mm diameter, 37 mm height

Mass (with 5 m of cable):     140 g

Cable:     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

Warranty:     4 years against defects in materials and workmanship