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


The SNiP-SR1 is a preconfigured 'Sensor Node Integrated Package' for LoRaWAN communication of real-time measurements of solar radiation, for continuous environmental monitoring.

The SNiP-SR1

The SNiP-SR1 integrates 1x AD-NODE and 1x SP-110 Milivolt Pyranometer Sensor to a site’s unique network, communication and power requirements.

The SP-110 Milivolt Pyranometer is an amplified sensor with a milivolt output and exhibits excellent cosine response to measure solar radiation. Total shortwave radiation is an important component in determining evapo-transpiration rates, energy balance, net radiation as well as monitoring solar power panels.


See Further Specifications on the AD-NODE
See Further Specifications on the SP-110 Milivolt Pyranometer Sensor from the Range of Apogee Silicon-Cell Pyranometers

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.

Solar radiation at Earth’s surface is typically defined as total radiation across a wavelength range of 280 to 4000 nm (shortwave radiation). Total solar radiation, direct beam and diffuse, incident on a horizontal surface is defined as global shortwave radiation, or shortwave irradiance (incident radiant flux), and is expressed in Watts per square meter (Wm-2, equal to Joules per second per square meter). Pyranometers are sensors that measure global shortwave radiation.

Apogee SP series pyranometers are silicon-cell pyranometers, and are only sensitive to a portion of the solar spectrum, approximately 350 – 1100 nm (approximately 80 % of total shortwave radiation is within this range). However, silicon-cell pyranometers are calibrated to estimate total shortwave radiation across the entire solar spectrum. Silicon-cell pyranometer specifications compare favourably to specifications for World Meteorological Organization (WMO) moderate and good quality classifications and specifications for International Organisation of Standardisation (ISO) second class and first class classifications, but because of limited spectral sensitivity, they do not meet the spectral specification necessary for WMO or ISO certification.

Typical applications of silicon-cell pyranometers include incoming shortwave radiation measurement in agricultural, ecological, and hydrological weather networks, and solar panel arrays.

Apogee Instruments SP series pyranometers consist of a cast acrylic diffuser (filter), photodiode, and signal processing circuitry mounted in an anodised aluminium housing, and a cable to connect the sensor to a measurement device. Sensors are potted solid with no internal air space and are designed for continuous total shortwave radiation measurement on a planar surface in outdoor environments. SP series sensors output an analogue voltage that is directly proportional to total shortwave radiation from the sun. The voltage signal from the sensor is directly proportional to radiation incident on a planar surface (does not have to be horizontal), where the radiation emanates from all angles of a hemisphere.

AD-NODE: For High Resolution Analogue & Digital Sensors

The AD-NODE is designed for those requiring precision in their analogue and digital measurements. With a 24-bit ADC, the AD-NODE supports two RTDs, a 0–10V with compressing range and a 4–20mA input. Each of the four dry-contact digital inputs is capable of simultaneously sampling at 1 kHz, with periodic reporting. Settings on the device can be altered remotely via LoRaWAN™ or locally via USB.

  • LoRaWAN™ low-power long-range connectivity
  • 2x 24-bit RTD
  • 1x 24-bit Voltage input (0-10 V with compressing range)
  • 1x 24-bit 4-20 mA
  • 4x 32-bit dry-contact counting digital inputs, 2 x digital outputs
  • 400 Hz 3-Axis Accelerometer
  • 3 x AA Lithium Energizer battery
  • Fully reconfigurable via LoRaWAN™ downlinks


SP-110 Milivolt Pyranometer

All Apogee pyranometers incorporate a silicon-cell photodiode that measures total shortwave radiation with a sensor housing design that features a fully potted, domed-shaped head making the sensor fully weatherproof and self-cleaning.

ISO 9060:2018 Class C (previously known as second class)
Power Supply Self-powered
Output (Sensitivity) 0.2 mV per W m-2
Output Type 0 to 400 mV
Digital Input Voltage
Calibration Factor (reciprocal of output) 5 W m-2 per mV
Calibration Uncertainty ± 5 %
Measurement Repeatability Less than 1 %
Long-term Drift Less than 2 % per year
Non-linearity Less than 1 % up to 2000 W m-2
Response Time Less than 1 ms
Field of View 180°
Spectral Range 360 to 1120 nm
Directional (Cosine) Response ± 5 % at 75° zenith angle
Temperature Response 0.04 ± 0.04 % per C
Operating Environment -40 to 70 C; 0 to 100 % relative humidity;
can be submerged in water up to depths of 30 m
Dimensions 24 mm diameter, 33 mm height
Mass (with 5 m of cable) 90 g