LI-COR LI-193 Underwater Spherical PAR Sensor

The LI-COR LI-193 Underwater Spherical Quantum sensor accurately measures photon flux from all directions and gives an added dimension to underwater PAR measurements.


  • Uses computer-tailored filter glass to achieve the desired quantum response
  • Calibration is traceable to NIST
  • Features corrosion-resistant, rugged construction for use in up to 350m depths
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The LI-COR LI-193 Underwater PAR Sensor gives an added dimension to underwater PAR measurements as it measures photon flux from all directions. This measurement is referred to as Photosynthetic Photon Flux Fluence Rate (PPFFR) or Quantum Scalar Irradiance. This is important, for example, when studying phytoplankton, which utilize radiation from all directions for photosynthesis. The LI-193 features a high sensitivity optical design and compact, rugged construction for use in freshwater or saltwater and pressures up to 493 psi or 350 meter depths.

  • Absolute Calibration: +/-5% in air traceable to NBS
  • Sensitivity: Typically 7 uA per 1000 umol s-1 m-2 in water
  • Linearity: Maximum deviation of 1% up to 10,000 μmol s-1 m-2
  • Stability:< +/-2% change over a 1 year period
  • Response Time: 10 us
  • Temperature Dependence: +/-0.15% per C maximum
  • Angular Response:< +/-4% error up to +/- 90 degrees from normal axis
  • Azimuth:< +/-3% error over 360 degrees at 90 degrees from normal axis
  • Detector: High stability silicon photovoltaic detector (blue enhanced)
  • Sensor Housing: Corrosion resistant metal with acrylic diffuser for both saltwater and freshwater applications
  • Waterproof: withstands 500 psi pressure (350 meter depths)
  • Size: 6.1cm Dia. globe; 3.18cm dia. housing; 10.7cm H
  • Weight: 142g
  • Mounting: (3) 6-32 holes are tapped into the base for use with the 2009S Lowering Frame or other mounting devices
  • Cable: Requires 2222UWB Underwater Cable
Questions & Answers
Does this sensor include a cable?
Cables for the LI-COR Underwater PAR sensors are sold separately in lengths of 3m, 10m, 30m, 50m, and 100m. Please refer to the Accessories tab for more information.
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LI-193 underwater spherical PAR sensor with microamp output, requires underwater cable
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