CTG News - Winter 2015  

Newsletter (pdf)

CTG supplies water monitors for ship exhaust gas cleaning systems

   CTG supplies water monitors for ship exhaust gas cleaning systems

To comply with International Maritime Organization (IMO) environmental regulations, global shipping is required to meet specific exhaust gas emission levels. One method of doing this is to clean emissions before release using an exhaust gas scrubber system. All varieties of wet scrubber systems use wash water which must be monitored at all times to avoid discharges that may exceed regulations and damage the environment. 


Sea Sentry is our proven wash water monitoring system which monitors both the sensor inlet and outlet of wet exhaust gas scrubber systems,” said CTG’s Marketing Director, Richard Burt.  “We are currently supplying Sea Sentry to the marine industry’s leading provider of Exhaust Gas Cleaning Systems and our systems are now installed on over 34 vessels.”


Sea Sentry is a turnkey solution with includes Polycyclic Aromatic Hydrocarbon, Turbidity, Temperature & pH absorbance sensors. A touch screen display provides a flexible user interface and data is relayed to a main control system via an Ethernet connection.


CTG leads the way in Ballast Water Compliance Monitoring

  FastBallast CTG leads the way in Ballast Water Compliance Monitoring   

The spread of invasive species is now recognized as one of the greatest threats to the ecological and the economic well-being of the planet. With implementation of the International Maritime Organisation (IMO) Ballast Water Convention (2004) due shortly,  it is estimated that 68,000 vessels will require certified ballast water treatment systems by 2016.


"A key requirement for any installed treatment system is to provide analysis of the ballast water at the point of discharge to demonstrate correct treatment,” said Katie Davage, CTG’s Sales Manager. The CTG FastBallast Compliance Monitor does just that. Using the inherent high sensitivity of the monitor, the variable fluorescence from live phytoplankton in moving ballast water can be monitored to the levels required by both the IMO D2 and US Coast Guard discharge standards (10 to 50 um category). Based on established fluorescence methods, FastBallast has been specifically developed to detect viable phytoplankton at low concentrations, exactly the conditions encountered in ballast water. FastBallast interrogates the photosynthesis processes that only takes place within living phytoplankton and is thereby able to determine the efficacy of the ballast water treatment process.


New range of on-line & portable water quality monitoring systems

    bacti hawk uvilux New range of on-line & portable water quality monitoring systems

"We’ve just launched an exciting new range of on-line and portable monitoring systems which provides significant advances in monitoring key parameters within the Water Industry,” said CTG’s Sales Manager, Justin Dunning. "Addressing the management of both water supply and water recovery plants, we now have the following systems available:  Bacti-Station &  Bacti-Wader, BOD-Station & BOD-Wader, Algae-Station & Algae-Wader plus the Oil-Station & Oil-Wader."   



CEFAS choose the new CTG Bacti-Wader Pro System for work in shellfish waters

    CEFAS CEFAS choose the new CTG Bacti-Wader Pro System for work in shellfish waters

CEFAS (Weymouth Laboratory) recently purchased the new CTG Bacti-Wader Pro System. CTG has collaborated with the CEFAS Water Quality team on a number of surveys over the past year which has resulted in a better understanding of how Tryptophan-like fluorescence can help inform on background bacteria levels and can ultimately help target water sampling.


The CEFAS team have also contributed to the practical considerations in putting together an easily deployable, robust system which has led to the realisation of the CTG Bacti-Wader Pro System. This system consists of a UviLux Tryptophan fluorometer and UviLux CDOM fluorometer which are combined both electronically and mechanically to make a single assembly - the CTG Dual-Lux. This is connected by a suitable length of cable to the new  Hawk Handheld Display and Logger creating a portable self-contained robust system suitable for work in the field.



CTG UviLux range expands and goes deeper

   IrishAirField CTG UviLux range expands and goes deeper 
The new UviLux range of LED based in situ UV fluorometers includes two new configurations. A new UviLux is now available specifically targeting fuel products including BTEX, petrol and aviation fuel.  
There is also a new CDOM UviLux available to allow referencing CDOM fluorescence background levels when used alongside the Tryptophan UviLux.  The new UviLux range are all now rated to 1000 metres. This new depth rating, together with the low power consumption and flexible data output protocol make the new UviLux ideal for use on Gliders and AUVs.


British Geological Survey use UviLux Tryptophan sensor to monitor contamination of ground waters in Africa

    BGS UviLux British Geological Survey use UviLux Tryptophan sensor to monitor contamination of ground waters in Africa

Shallow hand dug wells and boreholes are particularly important as local sources of water in sub-Saharan Africa. They are also potentially most at risk from anthropogenic contamination. As such, mapping groundwater contamination and understanding the key risk factors remains a priority. The risk of microbial contamination is often evaluated using sanitary risk assessments and characterised using thermotolerantcoliforms and faecal streptococci as indicators.


A team from British Geological Survey led by Dan Lapworth  have been involved in a pilot study investigating the use of two novel techniques to screen for groundwater contamination:  in situ optical fluorescence for Tryptophan (a protein waste water marker) and molecular pathogen screening (qPCR). Groundwater quality surveys were carried out during the wet and dry seasons at 50 sites (including both shallow hand dug wells and boreholes) across Kabwe, Zambia. Kabwe has a population of around 200,000 which is largely dependent on ground water for water supply and has a history of legacy contamination due to mining.   Field measurements of Tryptophan concentrations were carried out using a CTG UviLux which records fluorescence intensity selective for Tryptophan (280nm-360nm excitation – emission wavelength pair). This was used in a bucket to analyse pumping grab samples and also lowered down a newly constructed borehole to profile changes in Tryptophan with depth.


Pre-launch batch of new Act2-based laboratory & FerryBox systems sold

    Act-2 Pre-launch batch of new Act2-based laboratory & FerryBox systems sold

“The new Act2 system for probing phytoplankton photosynthesis builds on our highly successful FastAct system which has widely been used, in combination with our FastOcean FRRf, to run fully automated fluorescence light curves and other laboratory-based fluorescence measurements,” said CTG’s Chief Scientist, Dr Kevin Oxborough.  “Such is the demand for these systems that the first pre-launch batch has already been sold. Systems are destined for use in Australia, New Zealand, the USA, France, Germany, the Netherlands & the UK.”


Australian scientists use FastOcean System to monitor coastal health

    University of Sydney Australian scientists use FastOcean System to monitor coastal health

Dr David Suggett and his team at the University of Technology, Sydney have been using a CTG FastOcean to monitor coastal health along the East coast of Australia. “Primary productivity of the coastal ocean directly influences drawdown of atmospheric CO2 and fuels fisheries,” said Dr Suggett. “Conditions that regulate primary productivity are highly variable along the east coast and we have been using the FastOcean to better understand the control of nutrient availability on carbon fixation in waters off of the coast of Sydney; we have been adopting novel incubation approaches to better predict CO2 uptake capacity from FastOcean determined ‘electron transport rates’ within these waters. These data will feed into predictive models of environmental regulation of CO2 fluxes.”


Dr Suggett and his team have also been developing novel functional-trait based approaches, based on photo biological signatures produced by the FastOcean to discriminate ‘healthy functioning’ amongst closely related microbes. “Genetic tools are frequently used to assign ‘species’ level markers to marine microbes but we have developed a novel FRRf-based approach to identify functional groups,” said Dr Suggett. “We have applied this to the symbiotic algae of corals and currently evaluating how this can provide an improved means of determining the susceptibility of corals to stress.”

More information:
Great video - UTS C3 coral specialist Dr David Suggett discusses his use of bio-optical sensors to measure the health and productivity of organisms that photosynthesise such as coral. 
Technical Paper - Functional diversity of photobiological traits within the genus Symbiodinium appears to be governed by the interaction of cell size with cladal designation,  New Phytologist, 2015. 


Czech Academy of Sciences use FastOcean Systems to study marine photosynthesis

    Czech Academy of Sciences use FastOcean Systems to study marine photosynthesis

“To understand how human activities and global (climate) change affect marine environments, we need to understand the role of phytoplankton and photosynthesis,” said Dr Evelyn Lawrenz. “For the last four years we have been using the CTG FastOcean and FastAct FRRf fluorometers  to improve photosynthesis and primary productivity measurements.” 


“Last summer we took the FastOcean FRR fluorometer and FastAct to the laboratory of the Scottish Association for Marine Science in Oban, Scotland to investigate how diel changes in underwater light affect photosynthesis and the conversion factors in different phytoplankton communities. This year, Professor Ondřej Prášil and I took the FastOcean to sea on the RV Hakuho Maru to study the relationships between electron transfer and carbon fixation during the development of the annual phytoplankton spring bloom along the coast of Hokkaido, Japan. In addition to this field work, we are also using phytoplankton cultures to study the effects of various environmental stresses on different photosynthesis proxies.” Evelyn Lawrenz is currently visiting the Royal Netherlands Institute of Sea Research in Yerseke working with Dr Jacco Kromkamp to study how sudden changes in nitrogen availability affect the fluorescence response, photosynthesis and the optical properties of marine phytoplankton.  


CTG DualSense Transducers deployed from SAAB Dynamics AUVs

  CTG DualSense Transducers deployed from SAAB Dynamics AUVs  

SAAB Dynamics AB in Sweden, have chosen the CTG DualSense 115 Acoustic Transducer for fitment to their AUVs for use in Anti-Submarine Warfare Training.  The SAAB AUV62-AT is designed for use as an acoustic target.  The DualSense 115 is towed on a small cable behind the AUV, and detects sonar signals used to determine realistic Target Echoes, these signals being repeated from transmitter units on board the AUV. The DualSense 115 forms part of a series of spherical, horizontally omni-directional, reciprocal underwater acoustic transducers which provide both reliability and durability for applications as both hydrophones and projectors. .


Enhanced acoustic submarine test & evaluation capabilities

    ERAS Enhanced acoustic submarine test & evaluation capabilities

CTG’s Echo Repeating Acoustic Source System (ERAS) has recently been upgraded to extend its frequency range of operation to 280-2600Hz and repackaged to enhance its portability.  A fast, modern ruggedized laptop system coupled with a new 24–bit digitisation system over a USB interface removes the requirement for dedicated DSP processors and conversion hardware. ERAS is a compact and versatile system for the performance evaluation of a wide range of active and passive sonar. It has been designed to be hand-deployed from small vessels with few facilities - the transducer assembly is a small lightweight unit containing both projector and hydrophone.   


CTG working on novel device to measure spray deposits on crops

    CropStrayingSwitzerland CTG working on novel device to measure spray deposits on crops

“We are in the early stages of an Innovate UK funded project to develop a novel handheld imaging device to measure spray deposits on crops, so that they can be rapidly quantified by spray operators in the field,” reports CTG’s Technical Director, Dr John Attridge. “This will enable spray operators to determine and optimise sprayer performance e.g. according to crop structure, growth and weather conditions, as well as quality assure spray applications and check for off-target contamination. We are working with a number of the UK’s leading horticultural producers who recognise the importance of setting new standards of best practice for crop spraying. It is anticipated that this new technology will readily transfer throughout agriculture and horticulture industry.”


CTG develop new sensor technology as part of SenseOCEAN initiative

  senseocean CTG develop new sensor technology as part of SenseOCEAN initiative 

“CTG are proud to be part of an EU-funded project, led by the National Oceanography Centre. SenseOCEAN is a collaboration between academic and industrial partners, all are leading sensor developers across Europe. The aim of the project is to deliver a small, integrated, multi-sensor package for monitoring a wide range of ocean biogeochemical parameters,” said CTG’s Dr Cathy Rushworth. “This is a really exciting opportunity for us to develop new sensor technology, as well as collaborate with other partners to deliver a validated, complete sensor package.”


CTG upgrades Calibration Laboratory

    Helen Turner CTG upgrades Calibration Laboratory

“We have recently expanded our calibration team with the appointment of Helen Turner as Calibration Scientist. Helen has a BSc in Forensic Science and is currently studying for an MSc in Chemistry,” reports Dr Cathy Rushworth.  


 “Our Calibration Laboratory has also been upgraded, including the installation of a state-of-the-art bench-top spectrofluorometer (HORIBA Scientific’s Aqualog). This enables us to detect both UV fluorescence from hydrocarbons and longer wavelength fluorescence from Chlorophyll. We have also recently installed a Millipore Milli-Q System which provides us with highly purified water for sensor calibration and preparing standard solutions. These new facilities provide us with the capabilities to analyse the fluorescence of unknown samples & select the most appropriate fluorometer for a customer’s needs.”


For more information on any of these news stories and products, please contact This e-mail address is being protected from spambots. You need JavaScript enabled to view it +44(0)20 8481 9019).