Continuous Chlorophyll Measurement

Distinction of green algae, blue-green algae (cyanobacteria), diatoms and crytophytes in a flow-through chamber - simple, quick and reliable

The AlgaeGuard is designed as a "plug and play" instrument, i.e. measurements are carried out automatically using pre-defined parameter settings immediately after boot-up or by pressing the start button on the touchscreen panel (right).

Continuous configuration by the operater is not necessary. Maintenance is as low as 1 hour per month.

Parameters can be changed using the external bbe PC software if necessary.

Measurement using the AlgaeGuard

  • direct chlorophyll fluorescence
    corresponds to wet-chemical chlorophyll analysis
  • spectral algae classes
    to simultaneously determine the content of chlorophyll according to green algae, blue-green algae, brown algae (diatoms and dinoflagellates) and cryptophytes
  • transmission
    parallel to chlorophyll measurement during each analysis, allows the compensation of the influence of substances which cause turbidity
  • yellow substances concentration (CDOM)
    influences the chlorophyll result due to its fluorescence; to improve the chlorophyll measurement, the yellow substance content is determined and used automatically for the chlorophyll correction
  • water temperature

Features & Informations


  • quick, simple chlorophyll determination with algae class analysis
  • direct measurement without sample preparation
  • simple operation and virtually maintenance-free
  • different communication ports, also in an industrial setting:
    • up to 8 alarm outputs (potential-free contacts)
    • up to 16 analog outputs (4-20mA)
    • serial interface for data transfer
    • USB port for simple firmware updates
  • integrated cleaning unit in measuring chamber prevents biofouling
  • touchscreen display
  • PC operation with bbe AOA software


Industrial Applications

  • cooling and utility water monitoring
  • raw water for drinking water treatment
  • industrial plants

Environmental Applications

  • lake and river analysis
  • oceanographic chlorophyll monitoring
  • environmental monitoring
  • research and education

PC Software

The external software can be used with the bbe AlgaeGuard to analyse the data and configure certain parameters. The software is supplied with the instrument. Measurements can be carried out however without an external PC.

Features for measurement mode:

  • saving of data and parameters at any time
  • graphic display of all measurement values
  • online display in LAN
  • calibration of the AlgaeGuard
  • parameterisation of the measurement

Features for data evaluation:

  • evaluation of the data as text and graphics
  • adaptation of new calibrations to datasets
  • data export to EXCEL and to text files
  • print function

Technical specification of our AlgaeGuard

Description Value
  • 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 correction
  • transmission
Measuring range 0 - 500 µg Chl-a/l
Resolution 0.05 µg Chl-a/l
Weight 16 kg
Size (H x W x D) 420 x 500 x 200 mm
Mains supply 230 V /50 Hz or 110 V / 60 hz
Power input 30 W
Sample volume 30 ml
Temperature Sample: 0 - 35 °C / Environment: 0 - 40° C
Housing protection IP54
  • RS232
  • up to 16 4-20mA analogue and 16 digital outputs
Maintenance interval 14 days

Subject to alterations!

Available variants of the AlgaeGuard


Item number: BG0086.0000

A spectrofluorometer for the measurement of chlorophyll-a in water (total content) in a flow-through cell with tubing.


  • algae differentiation
  • Yellow Substances correction
  • extended sensitivity
  • transmission measurement
  • automatic cleaning device

Principle of measurement:

  • determination of prompt fluorescence and calculation of chlorophyll-a

Measuring range:

  • 0-500µg chlorophyll-a/l
  • resolution 0.05 µg/l

Operation and data exchange:

  • up to 16 4-20mA and 16 digital outputs (optional)

To transfer results, an external PC is necessary!

Request a quote

Available accessories for the AlgaeGuard

Optional pump device and control (AG)

Item number: BG0086.0020

Optional pump device for the AlgaeGuard. Peristaltic pump for active sample pumping.

Wallmounting bracket (AOA/AG)

Itemnumber: BG0080.0091

Wallmounting bracket made of aluminium to attach the instrument to any vertical, flat surface at a distance of approx 500 - 1000mm. Can also be used to swivel the unit for better viewing perspective.

Protocoll Coverter SDI12 and serial

Itemnumber: BG0036.0900

Translates the measurement results from the bbe protocol to SDI12 etc.

position of switch: bbe device: protocol of data logger:
0 FluoroProbe SDI-12
1 AlgaeGuard EMC-1
2 AlgaeTorch AOA-Protocol
3 AOA SDI-12
4 AlgaeTorch SDI-12
5 PhycoProbe SDI-12
6 AlgaeTorch EMC-1
7 AlgaeGuard SDI-12

Dimensions: 16 x 9.5 x 5.5 cm, ~440g

Voltage: 100 – 240 V / 50 – 60 Hz (power supply unit)


Downloads & Information about the AlgaeGuard

Manuals, software and further informations for this product may be available in the internal area for registered users.