CTG & Sea Sentry

Stephanie Lavelle

Maritime Manager

Chelsea Technologies Group

COMMERCIAL IN CONFIDENCE

Chelsea Technologies Group

Application of

sensor

technology

Process control

& monitoring

Medical

diagnostics

Agribusiness

Fresh water &

coastal

monitoring

Offshore pipeline leak detection

Water quality monitoring

NAD

Tactical

oceanography

Acoustic target

simulation

Oceanographic

research

Sensors &

systems

Acoustic

transducers

Fisheries

Exhaust gas

monitoring

Ballast water

monitoring

FerryBox

Water

quality/Treatment

Bio/chem Security

Environmental

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CTG fluorometer products

• Visible• Algae

• Dye tracing

• UV• BTEX

• Polycyclic Aromatic Hydrocarbons

• Tryptophan

• CDOM

• Optical Brighteners

• Active• Photosynthesis

• Algal health

• Ballast water monitoring

COMMERCIAL IN CONFIDENCE

Sea Sentry - integrated cabinet solution

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Sea Sentry features

• Sensors

• Digital pH probes (pre-calibrated)

• Turbidity sensor, ISO 7027:1999(E) compliant

• Extended range PAHphe eq sensor

• Turbidity, ‘colour’ and temperature correction

• Integrated sensor validation/calibration protocols

• Solid standards for optical sensor validation

• System

• Integrated pump & de-bubbler

• Pneumatic anti-fouling protection

• Single board interface electronics

• Touchscreen Graphical User Interface

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Fluidics

pH sensor

controller

pneumatic

solenoid

valves

pneumatic

regulator

de-aerator

pressure

gauge

pump

outlet

isolation valve

pressure relief

valve

flow meter

turbidity sensor

inlet isolation valve

PAHphe eq sensor

pH sensor mount

strainer

drain valve

De-bubbler design

Aerated

Water

Outlet

Low Pressure

Bleed

Sensors

De-a

era

tor

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• Single interface PCB

• All wiring on removable connectors

• Easy field replacement

• Digital interfaces

• MODBUS via Ethernet

• Dual redundancy

• USB 2.0 for data download

• Analogue interfaces

• Optional 5 off 4-20 mA

Electronics - enclosure

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Integrated fluorometer & transmissometer

Fluorometer

• Range: 0.04 to 4500 µg/l, PAHphe eq (corrected)

• Sensitivity: <0.07 µg/l @ 1 Hz

• Excitation wavelength: 255 nm

• Emission wavelength: 365 nm

• Turbidity rejection: ≤5% deviation for 300 µg/l Phenanthrene

over turbidity range 0-1000 FNU (corrected)

Transmissometer

• Measurement range: 0 – 3.5 cm-1

• Resolution: 0.002 cm-1

• Pathlength: 1.25 cm

• Wavelength: 255 nm

PAH+ sensor

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Turbidity sensor

• Measurement range: 0 to 1000 FNU

• Sensitivity: 0.15 FNU @ 1Hz

• Measurement principle: ISO 7027:1999(E) compliant

• Wavelength: 860 nm

• Bandwidth: 30 nm

Turbidity sensor

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PAH+ & Turbidity sensors

• Calibration valid for 2 years (unpowered)

• Calibration interval 12 months in use (return to CTG)

• On-site validation using solid sensor calibration

check

pH Sensor

• Calibration interval 1 month in use (on-site)

• Software based calibration protocol using pH4 &

pH7 buffer tablets

Sensor calibration & validation

Optical sensor

calibration check

COMMERCIAL IN CONFIDENCE

Touchscreen GUI

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GUI – home screen

COMMERCIAL IN CONFIDENCE

Sea Sentry

• Sensors

• Digital pH probes (pre-calibrated)

• Turbidity sensor, ISO 7027:1999(E) compliant

• Extended range PAHphe eq sensor

• Turbidity, ‘colour’ and temperature correction

• Integrated sensor validation/calibration

protocols

• Solid standards for optical sensor validation

• System

• Integrated pump & de-bubbler

• Pneumatic anti-fouling protection

• Single board interface electronics

• Touchscreen Graphical User Interface

COMMERCIAL IN CONFIDENCE

Thank You

www.chelsea.co.uk