SITA Messtechnik GmbH - Operating Instructions SITA ConSpector
2 Fluorescence measurement for monitoring bath contamina-
tion
This manual describes the SITA ConSpector measuring device. The handy and easy-to-use device
is used for fluorescence measurement in liquids, e.g. for monitoring bath contamination in cleaning
and rinsing baths. For this purpose, the device detects residues of fluorescent impurities in the
liquid on the basis of fluorescence measurement. The measurement result is output as relative
fluorescence intensity in RFU. The unit RFU stands for Relative Fluorescence Unit and refers to the
fluorescence standards of SITA Messtechnik GmbH. The higher the measured value in RFU, the
higher the concentration of fluorescent substances.
2.1 Measurement procedures
Short description
The fluorescence of the bath contamination (e.g. drops of oil)
is excited by a UV light source. A photodiode in the sensor head
of the SITA ConSpector measures the intensity of the radiation
emitted by the fluorescence at a defined wave length in the blue
light spectrum. The strength of the fluorescence depends on the
contamination level per volume.
The SITA ConSpector works on the confocal measuring
principle. The excitation light and the light emitted by the
fluorescence follow the same parallel ray path. The
measurement of the contamination level can be easily realised
by immersing the remote immersion probe into the bath sample.
Detailed Description
Measuring principle
The fluorescence of organic contaminants (oils, greases, cooling lubricants, release agents, etc.)
is excited by a UV light source. A photodiode in the sensor head of the SITA ConSpector measures
the intensity of the radiation emitted by the fluorescence at a specified wavelength in the range of
blue light. The intensity is measured in the unit RFU (Relative Fluorescence Unit) and is related to
the SITA fluorescence standards. The lower the measured value in RFU, the lower the exposure of
the bath sample to fluorescent substances.
The fluorescence measured in the process liquid is a cumulative parameter of all fluorescent matter.
If the process bath has different types of contamination, the measured fluorescence cannot be used
to determine the kind of contamination or the individual concentration of the same. Non-fluores-
cent contamination introduced into the process bath are not detected.
Besides the continuous inspection of the bath contamination the device can also be used to meas-
ure the oil concentrations in solvent baths.
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