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.


Chelsea - Plankton Sampler

The Chelsea Plankton Sampler provides a modern replacement for traditional sampling mechanisms such as that used in the Continuous Plankton Recorder (CPR) programme of the Sir Alister Hardy Foundation for Ocean Science (SAHFOS). It is ideally suited for use in undulating bodies such as the Chelsea Technologies Group NνShuttle, to enable discrimination of zooplankton variability with depth. It is designed to operate autonomously, collecting ...

TurbiLux - Turbidity Fluorometer Sensor

TurbiLux is a sensitive, low cost digital IR turbidity sensor designed for compliancy with ISO 7027:1999 standard that offers the user significantly increased functionality when compared to existing turbidity sensors. TurbiLux can be deployed in a wide range of applications including flow-through systems for process monitoring and in-situ deployments in rivers, lakes and oceans. The TurbiLux has an acetal resin housing suitable for deploying ...


Dye Tracing

Monitoring the dilution and movement of a tracer introduced into the water column provides an excellent means of determining the path that may be followed by a discharge and the rate at which dilution is likely to take place. Fluorescent dyes such as Rhodamine, Fluorescein or Agma are the most frequently used tracers for such investigations. Chelsea Technologies has been providing dye tracing systems for over 30 years. Typical applications include sub-sea pipeline leak detection, pollution studies, natural water...

Real-time In-situ Effluent Monitoring

The UviLux BOD Indicator enables in-situ, real-time, reporting of BOD within both natural water systems and water processing plants. The monitor detects fluorescent proteins that are inherent within sewage and slurry and provides an output in BOD equivalent units. The principle behind the measurement is the excitation of Tryptophan-like fluorescence within UV wavelength band, which has been shown to correlate with both BOD and bacterial contamination. With complete flexibility of deployment methodology, the...



Chelsea’s expert on active fluorescence techniques presents at Challenger Society of Marine Science Biennial Conference

Chelsea Technologies Group will once again be exhibiting and presenting at the Challenger Society of Marine Science Biennial Conference & Mini-Expo at the Plymouth University, 8-10 Sept 2014.On ...


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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