SPAR: Irradiance

The SPAR is used to measure and record the activation of photosynthesis in fresh and salt water (radiation with wavelengths between 400 nm and 700 nm) and the irradiance.

 Flat LI-cor sensor

 Light and compact

 Wireless fast configuration and data collection


Features and benefits

  • SPAR enables to measure and record active radiation for photosynthesis in fresh and salt waters (radiation with wavelengths between 400nm and 700nm) and the irradiance.
  • The amount of light energy received is expressed in µmol.m-2.s-1
  • SPAR is available in 2 versions:
    with a flat LI-cor sensor
    with a spherical LI-cor sensor
  • Easy to deploy:
    Light and compact
    Fast wireless configuration and data collection thanks to a communication interface (Inductive Data Pencil) connected to the USB port of a PC using Winmemo software

  • Examples of use

  • Active radiation for photosynthesis in fresh and salt waters
  • Sensors

  • Radiation in air channel
  • Radiation in shallow water channel
  • Radiation in deep water channel
  • Technical data

  • Maximum depth: 300m
  • Operating temperature: -10°C / 45°C
  • Time: internal clock with calendar, clock drift 1min/month
  • Sampling rate: programmable from 1 second to 99 hours
  • Autonomy:
    Memory: 1Mo with data compression
    Energy: 12 000 days (depending on sampling rate)
  • Radiation in air channel:
    Measurement range: 0 – 2000 µmol s-1 m-2
    Rsolution (12 bits): 0.5 µmol s-1 m-2
  • Radiation in shallow water channel:
    Measurement range: 0 – 100 µmol s-1 m-2
    Resolution (12bits): 0,024 µmol s-1 m-2
  • Mechanical features:
    Housing: tube in plastic (cap in Ketron)
    Dimensions: housing Ø40 x 183 mm (probe Ø 5x 130 mm)
    Weight in air: Flat SPAR: 641 g / spherical SPAR: 588g