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matrixFlu VIS

Measurement of chlorophyll-a, cyanobacteria and CDOM

The high-end matrixFlu VIS fluorometer combines multiple excitation and detection wavelengths for fluorescence measurements in a single device with a highly compact design.

MatrixFlu VIS is primarily designed for the online detection of algae (cyanobacteria, green algae, etc.) and is expanded by the detection of CDOM.

State-of-the-art, specially selected LEDs are used for fluorescence excitation. The stability of measured values is increased by an internal temperature correction.



Equipped with our innovative G2 interface with web browser configuration, internal data logger, flexible protocols and data outputs, matrixFlu offers extensive features that go significantly beyond what’s available on the market today.

The unified platform of all TriOS photometers also facilitates a standardized spare parts and consumables system, which allows the use of a wide range of accessories for our devices. Furthermore the cutting-edge G2 interface enables quick integration into third-party systems.

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Measurement principle

The special optical arrangement of excitation and de- tection channels enables not only single values to be deter- mined, but also a 4x4 matrix of wavelength combinations. This allows quasi synchronous in-situ detection of EEMs (Excitation Emission Matrices).


  • Monitoring of bathing water: lakes, rivers and seas
  • Drinking water production and treatmentr
  • Raw water treatment
  • Environmental monitoring instrument


  • In situ measurements, no sampling or reagents
  • Real-time sensor
  • Optical window with nano coating
Measurement principleFluorescence, 3LEDs
Detector4 photo diodes with filter
ParameterChlorophyll a [μg/L]
Phyocyanin [μg/L]
CDOM [μg/L]
Measuring rangesChlorophyll a : 0...200 μg/L
Phyocyanin : 0...200 μg/L
CDOM : 0...500 μg/L
Measurement accuracy5%
T100 response time30 s
Measurement interval60 s
Housing materialStainless steel (1.4571/1.4404) or titanium (3.7035)
Dimensions (L x Ø)155 mm x 36 mm
Weight stainless steel : ~ 0.6 kg
titanium : ~ 0.5 kg
Digital interfaceEthernet (TCP/IP)
RS-232 or RS-485 (Modbus RTU, OGC PUCK)
Power consumption / supply≤ 1.8 W and 12...24 VDC (± 10 %)
Maintenance effort≤ 0.5 h/month (typical)
Calibration / maintenance interval24 months
Max. pressurewith Subconn : 30 bar
with fixed cable : 3 bar
in FlowCell : 1 bar, 2...4 L/min
Protection typeIP68
Sample temperature+ 2 ... + 40 °C
Inflow velocity0,1 ... 5 m/s
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