Harmful Algae monitoring 24/7 The best solution for the Online Monitoring of Algae Online, flow-through measurement of microalgal concentrations in rivers, lakes and reservoirs

Photo: Swiss Federal Institute for Environmental Science and Technology - Division of Hydrobiology/Limnology The AlgaeOnlineAnalyser continuously determines the algal content of water based on chlorophyll fluorescence in real time and without the need for sample preparation. The chlorophyll-a measurement is used as an approximation of the biomass of the micro-phytoplankton in the water. The measurement is based on the natural fluorescence of the photosynthetic apparatus of chlorophyll using excitation by light sources. Comprehensive excitation of all microalgae is made possible by six different...

Valve Control: the AlgaeOnlineAnalyser can analyse several water samples in sequence using valves attached to several different inlet tubes. The results allow direct measures to be taken to reduce undesired algae in, e.g., sample water, cooling water and aquaculture plants. Remote control and operation of the AlgaeOnlineAnalyser is feasible from a central computer system via the Modbus TCP/IP protocol. The instrument is calibrated using pre-installed algal classes before delivery. The algal cultures and the corresponding reference instrument are subject to continual quality control. What else...

Software, specifications and scope of delivery chlorophyll chlorophyll resulting from the excitation is measured. Spectra of different algal classes of an algal sample consisting of cyanobacteria, chlorophytes, diatoms, dinoflagellates and cryptophytes are recorded. A mean excitation spectrum normalized by chlorophyll-a content (fingerprint) of an algal class is determined. Using these “fingerprints” and a mathematical operation (best-fit procedure) enables to calculate the chlorophyll-a concentration from a complex mixture and the distribution of up to 4 different algal classes in a water sample....

Technical Details ▶▶ Immediate analysis of chlorophyll content ▶▶ Covers all algae classes with six excitation wavelengths ▶▶ Adjustable alarm thresholds ▶▶ prompt, on-site information on cyanobacteria ▶▶ long-term operation with minimal maintenance due to selfcleaning and antifouling ▶▶ calibrated using real algal cultures ▶▶ evaluation of the algal condition of the flow-through sample ▶▶ simple operation with touchscreen PC total chlorophyll-a [μg Chl –a/l], concentration green algae [μg Chl –a/l], concentration cyanobacteria [μg Chl –a/l], concentration brown class algae [μg Chl –a/l], concentration...