Oxygen Analyzer (Spectroscopy based)0 pages

BASE BA-O2FLR
Oxygen Analyzer
(Fluorescence Spectroscopy based)
The BASE BA-O2FLR is part of the BAGGI BASE® Instruments Series. They are the result of combining the latest
state-of-the-art-technology with over 50 years of industry experience.
The BA-O2FLR analyzer is designed for the measurement of the partial pressure of
oxygen, either gaseous or dissolved in liquids. The lowest detectable limit in liquid is
0.02 ppm (part per million); the lowest limit of O2 gas (at 1 atmosphere) is 0.05%.
Its main application is for water treatment facilities in the petrochemical field.
Therefore it can be delivered in a multipurpose package containing also an Oil-inWater analyzer (fluorescence spectroscopy based) and
an H2S concentration analyzer (UV spectroscopy
based).
The principle of operation is fluorescence based as
described hereafter:
• A lamp (LED) sends excitation light to one leg of a bifurcated optical fiber (refer to
the figure); the light is in the UV-Visible band.
• The fiber carries the light to the oxygen probe, polished to a 45° angle. The distant
end of the probe tip contains the sensor material (ruthenium or porphyrin) trapped
in a sol-gel matrix.
• The light excites the sensor material that fluoresces, emitting energy at 600nm or
650nm, according to the material.
• If the excited material encounters an oxygen molecule, the excess energy is transferred to the
molecule decreasing (quenching) the fluorescence signal. The degree of quenching is correlated to
the partial pressure of oxygen.
• The fluorescence is collected by the probe and carried to the spectrophotometer via the second leg
of the bifurcated optical fiber. The fluorescence intensity is measured and related to the partial pressure of
oxygen using the relevant equations. A dedicated probe measures the sample temperature, because the
equations depend on temperature.
The figure at the right shows the probe tip.
The system is completed by the Control Unit, made by the BASE® Series embedded computer and the related
actuators. This unit runs the application software for:
• collecting the measurement values from the sensor(s); if other instruments (such as H2S or Oil in Water
analyzers) are integrated in the system, they share the same control unit;
• evaluating the mathematical formulas for Oxygen pressure calculation;
• archiving the results in standard CSV format;
• presenting a graphical user interface (GUI) to the Operator;
• transmitting remotely the information/alarms via current loops, relay signals, serial lines and WiFi;
• calibrating the instrument;
The Control Unit is available also in ATEX certified versions.
This rugged system is designed for low maintenance.
The sensor is immune to environmental changes in pH, salinity and ionic
strength.
The sensor is immune to interference from moisture, carbon dioxide,
methane and other substances.
TDSCS00601AR0_BADO2

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B.A.G.G.I . SrL – V.le Campania,29 20133 Milano Italy – Tel. +39 02715547 – Fax +39 027490571 – baggi@baggi.com