Photon Systems Instruments (PSI) are leading suppliers of professional instruments for plant science,
Biotechnology, and Agriculture – including unique instruments for algae and cyanobacteria monitoring in the frame of water treatment and management.

PSI products for algae research and aquaculture include fluorescence and thermoluminescence monitoring devices, as well as a range of equipment for cultivation and production.


Portable Field Devices for algae and cyanobacteria monitoring: the AquaPens

Handheld, battery-powered devices for laboratory and field applications.
The portable AquaPens allow rapid measurements of chlorophyll fluorescence in suspensions and natural waters.

AquaPenAquaPen-C AP-C 100


On-line Fluorescence Monitors

  • Algal Online Monitor: a portable and robust device for online detection and continuous monitoring of photosynthetic microorganisms

Algal Online Monitor

  • OnlineFlow Fluorometer: an autonomously operated measuring station for the continuous in situ monitoring of active fluorescence emitted by photosynthetic microorganisms, including application such as drinking water quality and swimming pool water quality monitoring. Additional information on the OnlineFlow Fluorometer

Onlineflow Fluorometer



  •  PSI’s Thermoluminescence Systems investigate the structure of  energetic levels in the Photosystem II in algal or cyanobacterial suspensions.