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


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 S2-441 PAR-FAR Sensor is a digital sensor with SDI-12 communication protocol. Typical applications of PAR-FAR sensors include monitoring plant light environments, researching plant morphogenic activity, and photobiology studies.


See Further Specifications on the S-NODE
See Further Specifications on the S2-441 PAR-FAR Sensor

Further parameters can be added to the SNiP, without requiring loggers to match each distinct sensor, substantially reducing the cost of getting a fuller picture on the application. The S-NODE can support 3x additional SDI-12 sensors to the base package; see other IoT Nodes to include further sensor extensions in a custom Sensor-Node IoT Package.


The S-NODE (for Environmental Monitoring) has been designed to support the broad suite of SDI-12 based environmental sensors. The S-NODE can support sensors with higher power requirements; a solar panel can charge either the internal lithium-ion battery or both the node and sensor can be powered by an external 12V system (e.g. battery or mains source).

A decoder suitable for TTN will be provided based upon sensor configuration.

  • LoRaWAN™ low-power long-range connectivity
  • Supports the full range of SDI-12 commands, and sensors requiring constant excitation.
  • Optional CAT-M1
  • Solar rechargeable Lithium-ion or external 12V power options
  • Optional Multi-constellation GNSS
  • AS923, AU915 and US915 available, with other region plans available upon request.
  • Standard IP65 enclosure, optional IP67

S2-441 Light Sensor

The sensor features a rugged, aluminium housing that is fully-submersible and built to withstand harsh conditions. 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.


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
4 years against defects in materials and workmanship