Devices & Sensors

Instrument Description

Oxygen Sensor

Oxygen sensors measure dissolved oxygen concentration in seawater.

The Aanderaa Optode determines the in-situ oxygen concentration based on the ability of the sensing foil (platinum porphyrine) to act as a dynamic fluorescence quencher. Fluorescence is the ability of a molecule to absorb light of certain energy and then emit light with lower energy. The Optode excites its sensing foil by exposing it to a modulated blue-green light source, and due to its fluorescent behaviour, the foil then returns red light (longer wavelength, lower energy). The lower wavelength photon that is emitted is delayed by the presence of oxygen molecules, and the amount of oxygen determines the lag in time (or phase shift) between excitation of the foil and detection of the returned red light. By linearizing and temperature compensating this phase shift, the absolute oxygen concentration can be determined.

The SBE 43 uses a Clark polarographic membrane type (see image). In these sensors, oxygen molecules diffuse through a membrane and are converted at a gold cathode to hydroxyl ions (OH-). The rate of diffusion of oxygen molecules leads to a measurable electrical current that the sensor electronics converts to a voltage. The voltage signal is linear with partial pressure of oxygen. Taking temperature, salinity, and pressure into account, oxygen concentration can be calculated.

Sea-bird SBE63 Oxygen Sensors are designed to be integrated with Sea-bird CTD such as the 16plus V2, 37SIP and 19plus models and utilise the same optical principles of the Aanderaa Optode for measurement. The SBE 63 is designed for use in the pumped flow path of a CTD. Water does not freely flow through the plumbing between samples, allowing anti-foul concentration inside the system to maintain saturation and eliminating exposure of the sensor to light, maximizing bio-fouling protection. The elapsed time between the CTD and associated oxygen measurement is easily quantified, and corrected for in post-processing.

The Alec RINKO is a fast-response, high accuracy and high- resolution oxygen sensor based on an optical (phosphorescence) principle.

Specific Instruments

Individual instruments of the above category, which are (or have been) connected to our observatories. Click an instrument for detailed information.

Name/Model/ID Current Location
Aanderaa Optode 3830 (S/N 871) Ocean Networks Canada Offices
Aanderaa Optode 3830 (S/N 910) Marine Technology Centre
Aanderaa Optode 3830 (S/N 911) Marine Technology Centre
Aanderaa Optode 3835 (S/N 1415) Marine Technology Centre
Aanderaa Optode 3835 (S/N 1416) Marine Technology Centre
Aanderaa Optode 3835 (S/N 1417) Marine Technology Centre
Aanderaa Optode 3835 (S/N 1797) British Columbia Ferries
Aanderaa Optode 3835 (S/N 224) Ocean Networks Canada Offices
Aanderaa Optode 3835 (S/N 418) British Columbia Ferries
Aanderaa Optode 4175 (S/N 0580) Marine Technology Centre
Aanderaa Optode 4175 (S/N 0581) Marine Technology Centre
Aanderaa Optode 4175 (S/N 1684) Marine Technology Centre
Aanderaa Optode 4175 (S/N 18) Marine Technology Centre
Aanderaa Optode 4175 (S/N 579) Marine Technology Centre
Aanderaa Optode 4175C (S/N 0793) Marine Technology Centre


Click the instrument categories below for descriptions and lists of instruments belonging to that category.

3D Camera
Acoustic Receiver
Acoustic Release
Acoustic Transmitter
Acoustic Transponder
ADCP 1200 kHz
ADCP 150 kHz
ADCP 300 kHz
ADCP 400 kHz
ADCP 55 kHz
ADCP 600 kHz
ADCP 75 kHz
Air Bleeding System
Air Temperature and Humidity Sensor
Anti-Biofouling Device
Automatic Identification Systems (AIS) Data Source
Automatic Identification Systems (AIS) Interface
Automatic Identification Systems (AIS) Receiver
Barometric Pressure Sensor
Benthic Biogeochemical Experiment System
Benthic Chamber
BH Temperature Logger
Biofuel Cell
Borehole Measurements
Branching Unit
Broadband Seismometer
Cabled Observatory Reciprocal Acoustic Scintillation
Camera Lights
Camera Lights
Camera System
Campbell Scientific Datalogger
CO2 Sensor
Current Meter
Differential Pressure Gauge
Digital Optical Module
Dive Computer
Drifter Buoy
Earthquake Early Warning System Aggregator
Echosounder, Bioacoustic
Echosounder, Hydrographic Multibeam
Echosounder, Hydrographic Single Beam
Flow meter
Fluorometer CDOM
Fluorometer Crude Oil
Fluorometer FLNTU
Fluorometer Refined Fuels
Gas Tension Device
Ice Buoy
Ice Profiler
Imaging Rotary Sonar
In-situ Calibrator
Internal Device Monitor
Junction Box
Meteorological Station
Methane Sensor
Microbial Incubator
Microbial Sensor
Moving Vessel Profiler
Multibeam Non-rotating Sonar
Multibeam Rotary Sonar
Network Aggregator
Nitrate sensor
Oceanographic Radar System
Oxygen Sensor
Pan Tilt Lights
Particle Analyzer
pH Sensor
Plankton Camera System
Plankton Sampler
Power Supply
Precipitation Gauge
Precise Point Positioning - Float
Precise Point Positioning - Integer
Precise Point Positioning - Orbits
Precision Optical Calibration Module
Pressure Gauge
Profiling Sonar
Profiling Winch
Pump and Valve Control System
ROV Camera
Sediment Micro-Profiler
Sediment Trap
Short Period Seismometer
Sound Source
Sound Speed Sensor
Still Camera
Sub-bottom Profiler
Suspended Sediment Profiler
Temperature and Depth Logger
Temperature Array
Temperature Sensor
Tempo-Mini Controller
Turbidity Meter
Turbidity, Chlorophyll and Fluorescence
Underwater Cavity Ring-down Spectroscopy
Underwater Ultraviolet Raman Spectrometer
Underwater Voltammetric System
Vertical Profiler Instrument Package
Vertical Profiler System Base
Video Camera
Video Server
Water Quality Monitor
Water sampler
Wave Buoy
Wind Monitoring System