Introduction to Sensor
The S2-432-SS Red–Far-Red Sensor is a rugged digital sensor for measuring the Red/Far-Red (R/FR) ratio using Modbus RTU over RS-232/RS-485. Its fully submersible housing and marine-grade connector make it suitable for reliable measurements in demanding environments.
Specifications
Specifications
| Specification | Details |
|---|---|
| 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 | <1% |
| Long-Term Drift | <2% per year |
| Non-Linearity | <1% up to 400 µmol m⁻² s⁻¹ |
| Field of View | 180° |
| Wavelength Ranges | Red: 645–665 nm ±5 nmFar-Red: 720–740 nm ±5 nm |
| Directional (Cosine) Response | ±2% at 45°; ±5% at 75° zenith angle |
| Temperature Response | <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 | 140 g (with 5 m cable) |
| Cable | 5 m shielded, twisted-pair wire; TPR jacket; pigtail lead wires; 316 stainless-steel M8 connector |
| Warranty | 4 years against defects in materials and workmanship |
| Manufacturing | Assembled in the USA |
Features
Applications