Oil In Water Analyzer (Spectrometry based)0 pages

BASE BA-OW
Oil in Water Analyzer
(Spectrometry based)
The BASE BA-OW
is part of the
BAGGI BASE®
Instruments Series.
They are the result
of combining the
latest state-of-theart-technology with
over 50 years of
industry
experience.
The BA-OW is a continuous on-line Oil in Water
analyzer with the accuracy of PPMs (Part Per Million).
It is based on quantitative spectroscopical techniques
which allow for fast response, high accuracy and
easy configuration. It integrates a high resolution
spectroscope operating in the Visible/UltraViolet
spectrum. According to the analytes in the sample,
one of the following modes of analysis is offered:
• Measurement of the UV energy absorption at
selected wavelengths
• Measurement of the fluorescence caused by
the UV energy
In the first mode, the measurement technique relies
on the Beer-Lambert law. This one is a relationship

that relates the absorption of electromagnetic waves
energy to the properties of the material through which
the waves are travelling. The material is introduced in
a sample cell of specific optical path length. The UV
energy is transmitted to the cell via an optical fiber
cable, it passes through the cell space and the
residual energy is transmitted to the measuring
sensor by a second optical fiber. The wavelengths
corresponding to the maximum absorption are typical
of each analyte. The amount of the absorbed energy
TDSCS00120BR1_BAOW

is a known function of the analyte(s) concentration.
Please refer to the diagram.
The lamp emits broadband energy in the Visible and
Ultraviolet spectrum: this energy traverses the
measurement cell, where the liquid sample is flowing.
The energy that has not been absorbed is split by the
holographic grating into narrow band streams, each
one of them detected by a dedicated photodiode.
In the second
mode, the
measurement
technique
relies on
molecular
fluorescence.
Fluorescence
occurs when a
molecule
absorbs electromagnetic energy, either ultraviolet or
visible, and rapidly emits energy, at some longer
wavelength. An example is depicted in the figure
above. The wavelength distribution is characteristic of
the analyte molecule, while the intensity of the
emission (fluorescence) is correlated to the analyte
concentration. In this case the second optical fiber,
connected to the measuring sensor, collects the
fluorescence light at 90° from the direction of the
excitation light. In general, fluorescence
measurements are more sensitive than absorbance
based photometric measurements.
To compensate automatically for the presence of
suspended particles (Turbidity), the BA-OW analyzer
operates also as a Nephelometer. That is, it
calculates the particle density by measuring the light
reflected from the particles at specific wavelengths,
using the same Xenon lamp and detectors described
before. In this way, the Oil in Water reading is
unaffected by turbidity. The value of turbidity can be
displayed by means of the graphical user interface.
The use of measurements at auxiliary reference
wavelengths allows
also for the
automatic
compensation of cell
window deposits and
component aging.

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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