SEAGUARD® Dissolved Oxygen O20 pages

SEAGUARD® O2
Oxygen Recorder

The new AADI SEAGUARD® O2 is a robust instrument
based on the SEAGUARD® Platform. It is a self
contained instrument for measuring oxygen concentration. The instrument can be used as a platform for
additional measurements (like e.g. CTD, current,
turbidity, wave and tide).
Features of the SEAGUARD® O2:
•tHigh Resolution and low drift
•tLow maintenance needs
•tOptical measurement principle
•tLong time stability
•tMore than one year without recalibration
•tSelectable interval from 2 seconds to 2 hours
•tSEAGUARD® Studio vizualisation software
•tSmart sensor topology based on a reliable CANbus
interface (AiCaP)
•tOutput parameters: O2 concentration in mM, the Air
Saturation in % and the Temperatur in °C.
•tReal-Time XML Output on RS-422(optional)
•tFor use in sea and fresh water
•tWindows CE based datalogger with TFT based
colour touch panel for configuration
•t300m/2000m/6000m versions

Since oxygen is involved in most of the biological and
chemical processes in aquatic environments, it is the single
most important parameter 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.
•ttn shallow coastal areas with significant algae blooms.
I
•tt n fjords or other areas with limited exchange of water.
I
•tt round fish farms.
A
•ttn areas interesting for dumping of mine or dredging waste.
I
The AADI 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.

AADI is a trademark of Xylem Inc. or one of its subsidiaries.

The lifetime-based luminescence quenching principle offers
the following advantages over electro-chemical sensors:
•tt ot stirring sensitive (it consumes no oxygen).
N
•tt ess affected by fouling.
L
•tt easures absolute oxygen concentrations without
M
repeated calibrations.
•tt etter long-term stability.
B
•tt ess affected by pressure.
L
•tt ressure behaviour is predictable.
P
•tt aster response time.
F
The output parameters from the SEAGUARD® O2 are easily
presented in SEAGUARD Studio.
The SEAGUARD® O2 and the AADI smart sensors are
interfaced by means of a reliable CANbus protocol (AiCaP)
using XML for plug and play capabilities. The smart sensors
can be mounted directly on the top end plate of an
AADI SEAGUARD® and are automatically detected and
recognized.
The SEAGUARD® O2 can be used with AADI Real-Time
Collector for Real-Time data.

D394 - Feb 2012