Chelsea Technologies Group (CTG) provides multi parameter water sensor for the environmental monitoring (both oceanographic and inland water), contamination monitoring and process control markets. Satisfying the needs of both the civil and military markets CTG specialises in technologies ranging from optical and acoustic sensors to comprehensive environmental and process monitoring systems. For monitoring of algae loading at abstraction points to Water Treatment Works (to protect and maximize longevity of filters used within the works): In situ fluorometers UniLux, Trilux algae monitor would be suitable. For protection of water supplies against accidental or deliberate contamination: FastGuard Water contamination detection system and UviLux Hydrocarbon fluorometer would be ideal. For detection of effluent levels, Biological Oxygen Demand (BOD) tracking, Combined Sewage Overflow / fish kill events and Grey Water / Black Water cross-over: UviLux Effluent Monitor

About Us


A team of engineers and scientists are engaged in the design and manufacture of a range of sensors and systems for the marine, environmental, defence, homeland security, industrial process control and life science markets.  

For over 50 years, customers have been using our high quality sensors and systems in a wide range of applications -  submariners are using  them to understand the environment they pass through, water authorities are using them to test water supplies to guard against chemical attack by terrorists. Scientists are using our sensors to monitor oceanic algae to tackle climate change and shipping companies have installed state of the art in-line sensors to monitor their exhaust gas cleaning systems and ballast water in order to prevent contamination of seas. Oil companies are using our sensors to detect subsea pipeline leaks and monitor oil spills. Demand for the Chelsea sensors and systems  has also come from the food and automobile industries.


FastOcean - ADP Profiling System

FastOcean APD is an automous profiling system which comprises two FastOcean multi-wavelength Fast Repetition Rate fluorometers (ambient plus dark), pumped dark chamber, programmable battery pack and a PAR sensor for autonomous, in situ estimation of gross primary production. This system is smaller, lighter and more power efficient  than earlier FRRf profiling systems. This high performance system is suitable for use in a wide range of ...

UviLux BOD Monitoring - In-situ fluorometer for effluent detection

Chelsea Technologies Group (CTG) has addressed the challenge of monitoring of effluents in surface waters and water treatment processes with the low cost UviLux BOD Indicator. The UviLux BOD Indicator enables in-situ, real-time, reporting of BOD within water processing plants and effluents. The sensor detects fluorescent proteins that are inherent within sewage and slurry and provides an output in BOD equivalent units. The principle behind the ...


Monitoring of Algae in Drinking Water

The UniLux in-situ fluorometer can be configured to detect a number of key parameters that are of importance to the Water Supply Industry. Primarily, the detection of Chlorophyll a in stored water systems, such as reservoirs, assists in the planning and informs decisions on water abstraction in relation to natural algae blooms that regularly occur throughout the year. As well as Chlorophyll a, these in-situ fluorometers can detect cyanobacterias, such as Phycocyanin and Phycoerythrin, which are often associated...

Turbidity Monitoring

The monitoring of Turbidity is key requirement of the water industry in both water supply and water recovery systems. Within the water supply process, monitoring of turbidity allows operators to assess the efficiency of filters for particulate removal through the process. Similarly, with water recovery (Waste Water Treatment Works), the measurement of turbidity is a key parameter to track the removal of particulate through the process. CTG can provide turbidity measurements with the UniLux sensor, or provides...



Company details

Business Type:

Industry Type:
Water and Wastewater - Water Monitoring and Testing

Market Focus:
Globally (various continents)

Year Founded:


1,000,000 - 10,000,000 €

Office & Distributor locations:


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