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Online detection of chlorophyll concentration, algae classes and photosynthetic activity.

The bbe AlgaeOnlineAnalyser is deployed in measuring stations and laboratories in which online measurement of water quality is required for rivers, reservoirs, dams and lakes as well as in drinking water production. The instrument impresses due to its rapid analysis of chlorophyll concentrations. The chlorophyll concentration, the transmission and optionally the photosynthetic activity are determined simultaneously.

The detection of different algal classes by excitation with coloured LEDs distinguishes this measuring instrument from its competitors. Part of the analysis is a yellow substances (CDOM) measurement to adjust the calculation of the total chlorophyll content. The integrated cleaning unit protects against growth problems during long-term measurement.

Measurement principle

The fluorescence of algae via excitation by visible light mainly depends on the chlorophyll-a, a common pigment in the plant world. The presence of other pigments indicates different algae classes. The interaction of these different pigments with chlorophyll-a results in a special excitation spectrum for taxonomic algae classes.

The special patterns of this algal fluorescence - so-called fingerprints - are used in bbe fluorometers for the qualification of different algae classes. The light sources for the excitation are LEDs with selected wavelengths. The fingerprints of four algae classes and for yellow substances are pre-defined in the instrument. However, user-specific fingerprints can also be defined.

The physiological performance of the algae (algae activity) on photosynthesis is determined by exitation using additional background light. The resulting variable fluorescence allows the calculation of algae activity given as the Genty parameter. This Genty parameter represents the quantum yield and is also an expression of the vitality of the algae.


total chlorophyll [μg chl-a/l]

concentration of green algae [μg chl-a/l]

concentration of cyanobacteria [μg chl-a/l]

concentration of diatoms [μg chl-a/l]

concentration of cryptophytes [μg chl-a/l]

yellow substances

transmission (at 5 wavelengths)

water temperature

photosynthetic activity (Genty) (optional)

Chlorophyll0 - 200 μg chl-a/l
Measurement procedurespectral fluorometry
Resolution0.01 μg chl-a/l
Transmission0 - 100%
Measuring chamber cleaningautomatic cleaning piston
Housing materialV4A steel/aluminium/coated steel plate
Dimensions (H x W x D)420 x 600 x 200 mm
Protection classIP54
Mains voltage110/240V 50/60Hz
Power consumption100 W
TemperatureSample: 0 - 35 °C / Environment: 0 - 40° C
Sample volume30ML
Maintenance interval> 7 days
Sample inflowfree flow/tube pump
PCinternal PC with touchscreen
Outputs (options)
  • modem

  • 2 x analogue output 4-20 mA

  • 2 x relay output

  • SDI-12 with bbe converter

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Dianjiang Group Limited
Add: Room 1510,15/F,New Commerce Centre, No.19 On Sum Street, Shatin, N.T., Hong Kong.
Tel: (852) 3690 1588   Fax: (852) 3690 1586
Email: Dianjiang_HK@yahoo.com.hk   Hongkong@Dianjiangtech.com
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