PAR Sensor


Highly sensitive irradiance measurements to 1000 m water depth.


Gather highly sensitive data on light irradiance with the Chelsea PAR sensor. With a depth rating of 1000 m, the PAR sensor can be fitted to profiling systems or oceanographic moorings to get a complete picture of the photic zone. The long term calibration stability and titanium corrosion-resistant housing make it ideal for long term deployments on vehicles or wider instrumentation systems in all water environments.


How does it work?


Light is efficiently collected by a PTFE 2p Scalar Collector, supported by a clear acetal dome, and is directed onto a photodiode via a filter from which a (1+cosӨ)/2 response is obtained. With use of logarithmic amplification


Features & Applications



  • High sensitivity
  • Long term calibration stability
  • Logarithmic 6 Decade range
  • Wide angular detection range
  • 1000 m depth rating
  • Corrosion resistant housing


  • Sea-truthing of satellite data
  • Oceanographic and environmental studies
  • Referencing primary productivity measurements
  • Referencing in situ fluorometer measurements