S2-131 Red - Far-Red Sensor
Apogee Red - Far-Red sensors combine two photodetectors designed to measure wavelength ranges and peaks that approximate phytochrome absorption. The red / far-red ratio can be calculated from these measurements. Red and far-red wavelengths are of particular interest because they influence photosynthetic and morphogenic activity. Phytochrome pigments sensitive to varying ratios of red and far-red light provide information to the plant about its light environment.
Typical Applications
- Monitoring plant light environments
- Research plant morphogenic activity
- Photobiology studies
Key Features
Analog Output. A domed diffuser promotes self-cleaning to minimize errors from dust and debris.
High Quality Cable
Pigtail-lead sensors feature an IP68, marine-grade stainless-steel cable connectors attached directly to the sensor head to simplify sensor removal for maintenance and recalibration
| Power Supply: | Self-Powered |
| Output (sensitivity): | 0.01 mV per μmol m⁻² s⁻¹ (Red and Far Red) |
| Calibration Factor (reciprocal of sensitivity): | 100 μmol m⁻² s⁻¹ per mV (Red and Far Red) |
| Calibration Uncertainty: | ± 5% |
| Output Range: | 0 to 4 mV (Red and Far Red) |
| Wavelength Ranges: | 645 to 665 nm ± 5 nm (Red) 720 to 740 nm ± 5 nm (Far Red) |
| Measurement Range: | 0 to 400 μmol m⁻² s⁻¹ (Red and Far Red) |
| Measurement Repeatability: | Less than 1% |
| Long-term Drift: | Less than 2% per year |
| Response Time: | Less than 1 ms |
| Non-Linearity: | Less than 1% (up to 400 μmol m⁻² s⁻¹) (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 aluminium body with acrylic diffuser |
| IP Rating: | IP68 |
| Operating Environment: | -40 to 70°C; 0 to 100% relative humidity |
| Dimensions: | 30.5 mm diameter, 36.6 mm height |
| Mass: | 51 g |
| Warranty: | 4 years against defects in materials and workmanship |