SKP215 SKP215 Quantum Sensor
Measures incident quanta between 400 and 700 nm
weather applications supported water applications supported energy applications supported gas flux and turbulence applications supported infrastructure applications supported soil applications supported


The SKP215 measures incident quanta between 400 and 700 nm. Light in this waveband is used for photosynthesis and is often referred to as ‘PAR’ (Photosynthetically Active Radiation).

Quanta below 400 nm are not generally used in photosynthesis and those above 700 nm have insufficient energy for the process. The number of quanta is related to sugar production and this measurement is now a standard referred to in scientific papers worldwide. Filtering in the sensor means that the measurement may be made accurately under any light source (sun, tungsten, fluorescent, xenon, etc.).

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Benefits and Features

  • Modular mounting of components for easier field servicing and expansion
  • On-line processing for maxima, average, flux density or total flux
  • High-quality sensors for measurement of solar radiation and photosynthetically active radiation (PAR)
  • No power required
  • View data from multiple LoggerNet servers, Campbell Scientific data files, LNDB databases, HTTP dataloggers, and virtual data sources all in one RTMC project
  • Direct connection to datalogger
  • Low maintenance—extensive diagnostics let you know when maintenance is needed


Technical Description

Typical applications of the SKP215:

  • Comparison of photosynthetic efficiencies of light sources differing in spectral emission
  • Assessment of drift in radiation sources
  • Design of lighting arrays in greenhouses and environmental chambers
  • Predicting the efficiency of photosynthetic activity in plant growth, particularly under fluctuating light conditions such as plant canopies
  • Choice of planting sites in gardens or indoor growth facilities


Light Sensitivity Sensitive to light between 400 nm and 700 nm wavelength
Preset Output 1 mV per 100 μmolm-2s-1
Cosine corrected head (typical errors zero 0-70°, <10% 85-90°)
Operating Temperature -35°C to +75°C
Absolute Accuracy ±5% (typically <±3%)
Constructed from Dupont `Delrin' sensor head fully sealed to IP68
Blue-enhanced silicon photocell detector with low fatigue characteristics
Calibrated in units of µmolm-2s-1. Aµmol is the new name for the unit µEinstein, which is one millionth of Avagadro's number of quanta or photons.
Standard Cable Length 3 m

Case Studies

Norfolk Agricultural monitoring station with Konect
The John Innes Centre (JIC) is an independent, international centreof excellence in plant science and microbiology more