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


The SNiP-CLI2 is a 'Sensor Node Integrated Package' for LoRaWAN or CAT-M1 communication of the plant or canopy's real-time inception of light, for continuous plant, light and environmental monitoring.


The base SNiP-CLI2 integrates 1x MFR-NODE and 2 sensors to a site’s unique network, communication and power requirements: 1x SQ-110 Sun Calibrated PAR Sensor and 1x LINPAR Linear PAR Sensor.

The SQ-110 Light Sensor is a self-powered quantum sensor that measures photosynthetically active radiation and is calibrated for use in sunlight. The LINPAR Sensor is designed for long term monitoring of canopy light interception. LINPAR consists of 33 individual internal PAR sensors along a 1m length wand. PAR readings are averaged across all 33 sensors to give a single output value.


See Further Specifications on the MFR-NODE

See Further Specifications on the SQ-110 Sun Calibrated PAR Sensor
See Further Specifications on the LINPAR Linear PAR Sensor

Further parameters can be added to SNiP-CLI2, without requiring loggers to match each distinct sensor, substantially reducing the cost of getting a fuller picture on the application.


SQ-110 Sun Calibrated PAR Sensor

Radiation that drives photosynthesis is called photosynthetically active radiation (PAR) and is typically defined as total radiation across a range of 400 to 700 nm. PAR is often expressed as photosynthetic photon flux (PPF): photon flux in units of micromoles per square meter per second (µmol m-2 s-1, equal to microEinsteins per square meter per second) summed from 400 to 700 nm (total number of photons from 400 to 700 nm).

While Einsteins and micromoles are equal (one Einstein = one mole of photons), the Einstein is not an SI unit, so expressing PPF as µmol m-2 s-1 is preferred. Sensors that measure PPF are often called quantum sensors due to the quantised nature of radiation. A quantum refers to the minimum quantity of radiation, one photon, involved in physical interactions (e.g. absorption by photosynthetic pigments). In other words, one photon is a single quantum of radiation.

Typical applications of quantum sensors include incoming PPF measurement over plant canopies in outdoor environments or in greenhouses and growth chambers, and reflected or under-canopy (transmitted) PPF measurement in the same environments.

Apogee Instruments SQ series quantum sensors 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 PPF measurement in indoor or outdoor environments. SQ series sensors output an analogue voltage that is directly proportional to PPF under sunlight (e.g. model SQ-110) or electric lights (e.g. model SQ-120). 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.


The Multifunction Research Node has been designed to provide flexible communication, sensor and power options.

The MFR-NODE supports SDI-12 and 4 x dry contact digital inputs as well as optionally 2x differential / 4x single ended analogue inputs. The MFR-NODE supports 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). Optional CAT-M1 provide an option for remote installation and in areas outside the range existing LoRaWAN networks. The optional multiconstellation GNSS ensures you won’t lose track of your device. The MFR-NODE has an onboard 8GB SD Card to provide data logging capabilities and full data redundancy in the event of temporary loss of communications or dropped packets – ideal for research applications.

  • LoRaWAN™ low-power long-range connectivity
  • 8GB SD Card for data storage
  • Supporting SDI-12, 2 x 32-bit dry-contact counting digital inputs.
  • Optional 24-bit ADC for 2x differential / 4x single ended sensor.
  • Optional CAT-M1
  • Solar rechargeable Lithium-ion or external 12V power options
  • Optional Multi-constellation GNSS
  • External solar/battery input: 12-32V DC.


SQ-110 Sun Calibrated PAR Sensor

The SQ-110 is a self-powered quantum sensor that measures photosynthetically active radiation and is calibrated for use in sunlight. The sensor housing design features a fully potted, domed-shaped head making the sensor fully weatherproof and self-cleaning. Photosynthetically active radiation (PAR), or photosynthetic photon flux (PPF), is the wavelength range from 400 to 700 nanometers and is strongly correlated with plant growth. Gardeners, greenhouse managers, growth chamber users and salt-water aquarists measure PAR to insure optimal specimen health.

The SQ-110 can be used in combination with a LINPAR Linear PAR Sensor and LSM1 Light Sensor Meter for complete monitoring of the plant canopy light environment. The SQ-110 is installed above the plant canopy to measure ambient light conditions and one or more LINPAR sensors are installed within or beneath the canopy. This way leaf area index or the fraction of absorbed radiation can be monitored.


Sensitivity: 0.2 mV per µmol m-2 s-1
Calibration Factor: 5.0 µmol m-2 s-1 per mV (reciprocal of sensitivity)
Calibration Uncertainty: ± 5%
Measurement Repeatability: < 1%
Non-stability (Long-term Drift): < 2% per year
Non-linearity: < 1% (up to 400 µmol m-2 s-1)
Response Time: < 1 ms
Field of View: 180°
Spectral Range: 410 nm to 655 nm (wavelengths where response is greater than 50 % of maximum)
Directional (Cosine) Response: ± 5% at 75° zenith angle
Temperature Response: 0.06 ± 0.06% per C
Operating Environment: -40 to 70°C, 0 to 100% relative humidity, Can be submerged in water up to depths of 30m
Dimensions: 2.4 cm diameter and 2.8 cm height
Mass: 90g (with 5m of lead wire)
Cable: 5m of shielded, twisted-pair wire. Santoprene rubber jacket
Warranty: 4 years


The LINPAR Linear PAR Sensor

LINPAR is ideally supported by the LSM1 Light Sensor Meter for PAR Sensors in combination with the SQ-110 PAR Sensor. Up to 9 LINPAR sensors can be connected to the LSM1 Light Sensor to measure light within and beneath the canopy, and the SQ-110 installed above the canopy to measure ambient light. The data can then be converted to leaf area index or fraction of absorbed radiation.


Materials Anodised Aluminium, Acrylic. IP65 sealed
Cable 5m Enhanced polyethylene screened twin 18 x 0.1mm
Sensor 33, GaAsP Photodiodes. 350 – 680nm. Peak at 640 nm
Sensitivity 1 mV/10 µmol / m2 / s (V version)
Temperature Sensitivity ± 0.15% °C at peak response, from 0 – 50°C
Linearity 1% over 0 – 2000 µmol/m2/s
Uniformity of Sensing Surface Better than 2% over 0.85 sensing length
Response Time 2µs. 10 – 90%
Output V version (Voltage Version): 200mV/2,000 µmol/m2/s
A version (Current Version): ~1.8 µA/2,000 µmol/m2/s
Operating Temperature Range -20°C – +50°C
Cable Connections Blue … 0
Clear … +
Screen … Uncoated wire connected to plastic screen
Dimensions 1.2 cm x 1.5 cm x 1m
Materials Anodised aluminium and acrylic