Updated:2023-05-30
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The S2-432 Red - Far-red sensor outputs a digital signal using Modbus RTU protocol over RS-232 and RS-485. The sensor features a rugged, aluminum housing that is fully-submersible and built to withstand harsh conditions, and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. 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 |
Average Max Current Draw | RS-232 37 mA; RS-485 quiescent 37 mA, active 42 mA |
Calibration Factor | Custom for each sensor and stored in firmware |
Calibration Uncertainty | ± 5 % |
Measurement Repeatability | Less than 1 % |
Long-term Drift | Less than 2 % per year |
Non-linearity | Less than 1 % (up to 400 µmol mˉ² sˉ¹) |
Field of View | 180° |
Wavelength Ranges | 645 to 665 nm ± 5 nm (Red); 720 to 740 nm ± 5 nm (Far-Red) |
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 |
Manufactured | Made in the USA |
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