34 Water / Wastewater
A helping hand for passenger ship operators in the fight against the spread of Legionnaires’ Disease France/USA-based Infection Control Solutions expert aqua-tools has said that cruiseship and ferry operators must do more to protect passengers from contracting Legionnaires’’ disease and other infections from waterborne pathogens.
Concerned with the results from research that found higher levels of Legionella contamination in local ferries and cruiseships, aqua-tools’ CEO Marc Raymond said: “While larger, newer passenger ferries and cruiseships have been built with preventive measures aimed at curbing the spread of the Legionella, little has been done to protect passengers aboard smaller, older ships which, in many cases, are not well maintained.” The research paper to which Raymond refers is Legionella Risk Assessment in Cruiseships and Ferries, published in June 2017 by the US National Institutes of Health’s National Library of Medicine.
Researchers evaluated the frequency and severity of Legionella contamination on 10 ferries and six cruiseships alongside or in transiting the Port of Messina, Sicily. From the water and air samples tested for qualitative and quantitative identification of Legionella, the researchers found that Legionella pneumophila sg1 was present in samples of shower and tap water in 70% of the 10 ferries examined, and in 33% of the six cruiseships examined.
They found Legionella pneumophila sg 2-14 in 80% and 16.7% of these ships, respectively. And while no Legionella contamination was found in whirlpool baths, air and ice samples, they concluded that the “data confirmed higher levels of Legionella contamination in local ferries and cruiseships, underlining the need to adopt corrective actions more specific for these smaller vessels”.
Raymond said: “While the Norovirus continues to be the main cause of infection onboard passenger ships, Legionnaires disease, Pontiac fever and other infections from waterborne pathogens can be fatal. The high-risk points of use can expose passengers to an aerosolised form of water where water particles are inhaled. Aerosolisation primarily occurs at shower heads and faucets. But infection can be prevented by simply installing FILT’RAY 2GPoint-of- Use Filters on all outlets where water is intended for human use. “
To protect cruise and ferry passengers against nosocomial infection, aqua-tools has introduced its FILT’RAY 2GPoint-of-Use Filters to the maritime market.
Certified for use and proven in municipal and shoreside establishments, the membrane technology rapidly secures Point-of-Use by preventing the discharge of waterborne pathogens from faucet, shower and inline filters. The technology meets ISO 9001:2008, ISO TS 16949:2012, and ISO 13485:2012 medical standards and has received a Certificate of Sanitary Compliance in France, Germany, Australia and are considered as Medical Device Class 1. “Cruise ships are the equivalent of an “public building” so they have to prevent and manage the risks with regulations specific to each country under which they are flagged,” said Raymond
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Churchill Controls have recently launched their latest innovation, the Mega Link telemetry system, which is enhanced and partnered with the Mega Bridge IP communicator. This is a low-cost, versatile telemetry communication system for passing two-way instrumentation, measurement and control data between industrial plant and equipment, distributed over wide geographical areas and remote locations.
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Mega Bridge adds flexible and fully featured internet protocol (IP) connectivity to the well-established Mega Link family of telemetry and control units used to pass two-way instrumentation, measurement and control data between equipment and industrial plant. IP connection scenarios range from simple self-contained Local Area Networks (LAN), Wide Area Networks (WAN) to multiple networks anywhere across the internet for distributed geographical areas and remote locations.
Instead of a USB cable connected from the user’s laptop running DUCX configuration and diagnostics software, the laptop’s USB port is connected to a Mega Bridge unit operating in DUCX Bridge mode. The Mega Bridge will handle the setting up of a secure communication path with a dedicated message server to each of the respective Mega Bridge units, wherever they may be located in the world.
This cutting edge innovation was possible thanks to an impressive collaboration. For the past 24 months Churchill Controls have been engaged on a Knowledge Transfer Partnership (KTP) project with The University of Reading, part funded by Innovate UK. Churchill Controls have over 4 decades of providing cost effective solutions to the problems of monitoring and controlling remote industrial plant and this, combined with the additional collaboration from the KTP, resulted in providing the level of R&D needed to develop the highly innovative Mega Bridge.
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Innovation partnership creates new low cost solution to telemetry
communication
New fluorometers feature patented integrated optical compensation technology to improve
stability at low end of detection limit In-Situ has released a new line of fluorometers compatible with the company’s popular Aqua TROLL 500 and Aqua TROLL 600 Multiparameter Sondes. The line includes Rhodamine WT, Chlorophyll a, Phycocyanin (BGA-PC), and Phycoerythrin (BGA-PE) sensors, ideal for lake and river monitoring as well as coastal studies.
Representing a significant technological advance, In-Situ’s fluorometers are the only sensors in the multiparameter water quality market with integrated optical compensation. In-Situ’s patented technology uses a second detector to compensate for LED drift over temperature and time, providing more accurate and stable measurements.
The sensors are the latest addition to the company’s multiparameter water quality platform, which allows for wireless data collection via the VuSitu mobile app. The company is excited to introduce an expanded set of sensors for users looking to streamline fieldwork and reduce monitoring costs.
“With our patented Integrated optical compensation technology, our sensors provide greater stability at low limits of detection and have significantly reduced sensor drift over temperature and time,” says Product Manager Steven Sewell. “This allows you to be confident that changes in your data are tied to real field events and are not caused by sensor drift.”
The new fluorometers also feature isolated optical frequencies. Using two or more sensors simultaneously typically creates interference among sensors, In-Situ sensors use separate frequencies, providing a unique digital signature for each light source to minimize interference and improve accuracy. Another advantage offered by these new instruments isambient light rejection. External light can introduce bias in your data, but In-Situ fluorometers block external light for reliable performance in any setting and separate the light from the sensor and other ambient light sources. Accuracy is further enhanced by the low interference spectral bands. Unlike combined Chlorophyll/BGA sensors that measure wide ranges of the visible spectrum at once, In-Situ sensors excite a smaller, targeted range of the light spectrum, which increases accuracy and minimises interference.
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The industry leader
in sustainable sensor design.
for Pressure/Level Transducers Ideally, a pressure transducer would respond only to pressure. In reality, we know pressure readings can vary as temperature changes. Additionally, each individual transducer introduces variations of its own.
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To combat these discrepancies, Seametrics has developed a patented compensation technique: Digitally Temperature Compensated Strain-Gauge Pressure Measuring Apparatus that is used on the entire line of Seametrics pressure transducers.
Before leaving the factory, each sensor is individually calibrated. Using a high precision environmental chamber, numerous sample measurements are taken at 5°C, 20°C, and 35°C at both zero and full-scale pressures. Six calibration parameters are determined from this sample data, three for offset and three for slope. Offset and slope errors are defined as second order functions of temperature.
Parameters for both are determined by least squares fit of data for known temperature and known pressure samples. These parameters are then stored in memory on each individual Smart Sensor.
• Replaceable batteries • Field serviceable cables • Eco-friendly, modular design
seametrics.com IET November / December 2018
www.envirotech-online.com
During operation, uncompensated temperature and pressure data is collected and stored in the sensor memory. When data is retrieved from the sensor, the calibration parameters are also retrieved. The retrieving program, typically our Aqua4Plus2.0 control software, then applies the calibration parameters before displaying the data for export. The resultant data is highly accurate – each data point having been individually adjusted to compensate for temperature variations and individual characteristics of the particular sensor.
In addition to the unparalleled accuracy that Seametrics Smart Sensors offer, they’re also the only line of non-disposable, eco-friendly sensors on the market. With replaceable batteries, field serviceable cables, and modular, rebuildable sensor construction, they’re designed to minimize environmental and budgetary waste.
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47542pr@reply-direct.com Patented Temperature Compensation
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