One comment on this page ?


Measures active radiation for photosynthesis

SPAR enables to measure and record active radiation for photosynthesis in fresh and salt waters (radiation with wavelengths between 400nm and 700nm)
The amount of light energy received is expressed in µmol.m-2.s-1
Two versions of the SPAR are available:

  • with a Flat LI-Cor sensor
  • with a spherical LI-Cor sensor



The SPAR recorders are compatible with LI-cor LI-192SA and LI-193SA sensors.

Data logger

Measurement frequency : Programmable from 1s to 99h

Clock drift : 1min / mois

PC Interface: Electromagnétic Transmission without connector (connected with a serial link of a PC)

Working temperature : -10°C / +45°C

Maximum depth : 300 m


Memory size : 1Mo with data compression.

Energy : 12000 days (depending on the sampling time)

Radiation in the air channel

Measurement range : 0 - 2000 µmol s-1 m-2

Resolution (12 bits) : 0,5 µmol s-1 m-2

Radiation in shallow water channel

Measurement range: 0 - 1000 µmol s-1 m-2

Resolution (12 bits) : 0,24 µmol s-1 m-2

Radiation in deep water channel

Measurement range: 0 - 100 µmol s-1 m-2

Resolution (12 bits) : 0,024 µmol s-1 m-2

Weight in air

Flat SPAR : 641g

Spherical SPAR : 588g

Restricted Site Access
site mobile