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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
COMMERCIAL IN CONFIDENCE
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
COMMERCIAL IN CONFIDENCE
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
COMMERCIAL IN CONFIDENCE
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
COMMERCIAL IN CONFIDENCE
• 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
COMMERCIAL IN CONFIDENCE
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
COMMERCIAL IN CONFIDENCE
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
COMMERCIAL IN CONFIDENCE
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
COMMERCIAL IN CONFIDENCE
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