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DATALINK INSTRUMENTS (DTLI) was established in 1990, and is a French leading manufacturer for a wide range of On-Line Water Monitoring Analysers based on optical analysis methods such as UV spectroscopy, UV-Vis fluorescence, and colorimetric method.

All DTLI analysers are designed to provide the highest efficiency and reliability with the lowest maintenance.

DTLI offers the following range of on-line water analysers based on optical analysis:

  • Ammonia
  • BOD
  • COD
  • Chlorophyll – a
  • Chromium VI
  • Conductivity
  • Dissolved Oxygen
  • Fluorescein
  • Fluorescent tracers
  • Formaldehyde
  • Hydrocarbons
  • Nitrate
  • Nitrite
  • Nickel
  • Oil-In-Water
  • Parameters of Industrial Processes
  • pH
  • ORP
  • Phosphate
  • Rhodamin
  • Sulphide
  • Temperature
  • TOC
  • TSS
  • Turbidity

On-line chromium VI analyser


On-line chromium VI analyser


  • Long range stability thanks to UV spectroscopy
  • No reagent
  • Measurement within 5 seconds
  • Usable with unfiltered water
  • Compact size
On-line chromium VI analysis has become essential to uphold the environmental and sanitary regulations for all kinds of water: rivers and underground water, drinking water, industrial effluent, sewage. 

Reliability and stability are the main requirements of on-line
analysis systems only achieved by UV spectroscopy.

Main applications
  • Industrial effluent 
  • Drinking water mixing 
  • Sewage works 
Very low operating costs

The UV spectroscopy measuring principle requires no chemical reagent or calibration solutions resulting in very low operating and maintenance costs. 

No filtration

Thanks to simple, large bore tubing, turbid water with particles in suspension can be monitored without clogging risks. An optical turbidity compensation maintains correct measurements. 

Automatic cleaning system

A fully automated cleaning system prevents the CR200 file:///D:/Datalink/site_datalink_261108/P_CR200.html 1 sur 3 19/06/2009 19:34measurement flow cell from becoming dirty, giving the analyser autonomy for several weeks without maintenance. The cleaning solution (5% sulphuric acid) should be renewed once a month. This system is more reliable than falling-stream flow cells or in-medium probes. 

Xenon lamp

The xenon lamp has a lifetime of 109 flashes, equivalent to 10 years of use with one measurement every minute. Built-in peristaltic pump When the water is not pressurised (rivers, effluents, sewage), a peristaltic pump can be added to the analyser. It is synchronized with the measurements to increase the lifetime of the tubes. 

Battery/mains power supply

For field measurements or isolated sites, a 12V built-in battery can make the analyser autonomous for about 100 measurements. For plant applications, the battery provides total immunity against mains disturbances or power cuts, even over a long period. 

Built-in datalogger

The measurements are dated and stored in a static memory with a capacity of more than 10,000 measurements. They can be tranferred later via the RS232 port on a PC without specific software using Hyperterminalâ of Windowsâ. The data are compatible with standard worksheets, particularly Excelâ, to obtain graphs easily. 

Graphic display 

Measurements can be displayed on the graphic screen showing all data obtained during one hour, one day, one week, one month or one year. During the measurement cycle, a moving synoptic shows the operation sequence.


Ranges: 0 - 50 mg/l Cr6+ or 0 - 600 mg/l Cr6+ Other ranges on request

Repeatability: At 50 mg/l: +/- 0.1 mg/l Cr6+ typical 
At 200 mg/l: +/- 0.3 mg/l Cr6+ typical

Initial calibration: +/- 2% typical Sample

input/output: Stainless steel fitting for plastic tube external diameter 12mm

Pressure: Maximum 5 Bar

Flow: 0 - 5 L/mn, typical 0.5 L/mn

Sample temperature: > 0°C - 60°C

Outputs: 4-20 mA insulated,12 bit resolution 
High and low threshold relays

Communication: Port 1: RS232 for PC or modem or MODBUS 
Port 2: RS232 for on-line printer

Power supply: 110-120V / 220-240V 50/60 Hz 30VA 
+ built-in 12V battery

Casing: Watertight IP559 - Ambient temperature > 0°C - 60°C

Dimensions: 400 x 450x 250 mm -Without cleaning system 
650 x 450x 250 mm -With cleaning system

Weight: 13 Kg -Without cleaning system 
18 Kg -With cleaning system

Standards: CE Conformity - EN50081-2, EN50082-2, EN55011

Optional equipments: *  Peristaltic sampling pump 
*  Measurement remote control 
*  4 channels multiplexing system 
*  Modem


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