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Enabling better global research outcomes in soil, plant & environmental monitoring.

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