Apogee S2-400 Series PAR-FAR Sensor
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 of PAR-FAR sensors include measuring both the traditional PPFD photosynthetic photon flux and separately quantifying the photon flux of far-red photons (700-760 nm). The outputs include the traditional quantum flux, the far-red photon flux, and the far-red fraction (far-red photon flux density / sum of PPFD and far-red photon flux density). This sensor quantifies far-red photons, and for many applications it reduces the need for a more complex measurement with a spectroradiometer.
Further applications include:
- Monitoring plant light environments
- Researching plant morphogenic activity
- Photobiology studies.
The S2-441 PAR-FAR sensor is a unique two-channel digital sensor for measuring both the PAR (PPFD) and Far-red outputs of electric grow lights with SDI-12 communication protocol.
The S2-442 PAR-FAR sensor is a unique two-channel digital sensor for measuring both the PAR (PPFD) and Far-red outputs of electric grow lights with Modbus communication protocol.
You can use the S2-441 Sensor in a Sensor-Node IoT (Internet of Things) Package
The SNiP-PFR is a ‘Sensor Node Integrated Package’ for LoRaWAN or CAT-M1 communication of real-time measurements for continuous plant, light and environmental monitoring.
The base SNiP-PFR integrates 1x S-NODE and 1x S2-441 PAR-FAR Sensor (from the Apogee SI-400 Series) to a site’s unique network, communication and power requirements. The S-NODE can support an additional 3 sensors.
Available Videos:
Spectral response of PAR detector (blue) and Far Red detector (red) compared to defined response of plants to radiation (dashed).
| Calibration Uncertainty | ±5% |
| Measurement Repeatability | less than 1% |
| Long-term Drift | less than 2% per year |
| Non-linearity | Less than 1 % (up to 4000 µmol m⁻² s⁻¹) (PAR); Less than 1 % (up to 1000 µmol m⁻² s⁻¹) (Far-Red) |
| Response Time | less than 0.6 s |
| Field of View | 180° |
| Spectral Range | 389 to 692 nm ± 5 nm (PAR); 702 to 761 nm ± 5 (Far-Red) |
| Directional (Cosine) Response | ± 2 % at 45˚; ± 5 % at 75˚ zenith angle |
| Temperature Response | Less than 0.1 % per C |
| Operating Environment | -40 to 70 C; 0 to 100 % relative humidity |
| Dimensions | 30.5 mm diameter, 36.6 mm height |
| Mass | 51 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
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