Oxygen Optode 48350 pages

Oxygen Optode 4835
is a compact fully integrated sensor for
measuring the O2-concentration in shallow
water.
Advantages:
• Optical measurement principle
• Lifetime-based luminescence quenching
principle
• Long time stability
• More than one year without recalibration
• Low maintenance needs
• User friendly
• Use with Aanderaa SmartGuard/SeaGuard
• Automatically detected and recognized
• Use as stand-alone sensor
• Output format: CANbus AiCaP, RS232
• Operating range: 0-300 meters

Since oxygen is involved in most of the biological
and chemical processes in aquatic environments,
it is one of the most important parameters
needed to be measured. Oxygen can also be
used as a tracer in oceanographic studies.
For environmental reasons it is critical to monitor
oxygen in areas where the supply of oxygen is
limited compared to demand, e.g.
•t In shallow coastal areas with significant algae
blooms
•t In fjords or other areas with limited exchange
of water
•t Around fish farms
•t Areas of interest for dumping of mine or
dredging waste
The Aanderaa oxygen optodes are based on
the ability of selected substances to act as
dynamic fluorescence quenchers. The fluorescent
indicator is a special platinum porphyrin complex
embedded in a gas permeable foil that is exposed
to the surrounding water. A black optical isolation coating protects the complex from sunlight
and fluorescent particles in the water. This sensing

foil is attached to a sapphire window providing
optical access for the measuring system from
inside a watertight housing.
The lifetime-based luminescence quenching
principle offers the following advantages over
electro-chemical sensors:
•tNot stirring sensitive (it consumes no oxygen)
•tLess affected by fouling
•tMeasures absolute oxygen concentrations
without repeated calibrations
•tBetter long-term stability
•tLess affected by pressure
•tPressure behaviour is predictable
•tFaster response time
The oxygen optode outputs data in AiCaP CANbus
and RS-232. The sensor can present the O2
concentration in µM, the Air Saturation in % and
the Temperature in °C.
The SmartGuard and SeaGuard data logger and
the smart sensor are interfaced by means of a
reliable CANbus interface (AiCaP), using XML
for plug and play capabilities.

D385 - Jan 2013