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S2-432 Modbus Digital Output Red - Far-Red Sensor

Updated:2025-03-13

Brand: APOGEE
Model: S2-432
Description: 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 withsta
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Product Details

S2-432 Modbus Digital Output Red - Far-Red Sensor Introduction：

Specification Sheet

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.

S2-432 Modbus Digital Output Red - Far-Red Sensor drawing：

S2-432 Modbus Digital Output Red - Far-Red Sensor Specifications:

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