McNab Model KSA Near-Infrared Direct Reading Process Analyzer
continuous, real-time and unattended monitoring of chemical concentration
in the process environment.
KSA Analyzers: From 200 to 2,500 nm
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of a flow cell unit, two modular optical cells: one for the NIR-UV
radiation source, the other for the scanner; and an indicator/controller
cabinet, the KSA family of concentration analyzer systems continuously
monitor chemical concentration by direct across-the-pipe measurement of
absorption peaks in the production/quality control environment.
fixed-filter KSA instruments measure the change in radiation received from
the NIR-UV source to the scanner photocell detecting unit.
These signals are transmitted to an indicator/controller unit that
contains the electronic circuitry necessary to process the signals, to
display the readings, to input desired set points, to indicate alarm
levels and to operate alarm relays. It
also has continuous output for proportional control connections.
Model KSA uses the very latest optical technologies to provide stable,
low-noise signals across the NIR range.
Collimated NIR-UV radiation is directed through the process fluid
stream to the detector unit that generates electrical signals. These
signals are preamplified and sent to the indicator/controller cabinet,
which compares the NIR-UV signatures with those for which the KSA has been
calibrated. The ratio of the
NIR-UV signature and the background process fluid signal is calculated,
allowing the instrument to instantly self-correct for changes in the fluid
stream caused by such items as color, turbidity or window fouling.
the flow cell unit is pipe-mounted, the KSA provides immediate
across-the-pipe measurements at operational pressures and temperatures.
Distortions caused by sample temperature and/or pressure changes are
avoided, as are other compromises normally required of off-line sample
lines or with laboratory analysis.
across-the-pipe optical path can he visually inspected any time during
operation without pipe shutdown, and McNab’s unique modular optical
cells can he quickly hand-removed for off-line inspection, pressure test or
replacement. This design has eliminated the traditional problem of broken
window glass and fogging.
calibration is accomplished via the built-in calibration slot in the
Ultraviolet to Near-Infrared
KSA spectroscopic analyzers measure chemical concentration in process
KSA instruments utilize a unique calibration method that allows simple
verification without flow interruption.
Such in-process verification offers great savings in terms of time
and expenses related to flow interruption, line dewatering and sensor
disconnection; and because the pipe is never opened, hazardous or sterile
conditions are nor compromised.
may be accomplished using a standard reference optical filter cartridge,
which offers reliable analyzer testing for its quality assurance
documentation (ISO 9000 and others.)
Optical And Electronic Design Provides Greater Range
KSA's electronics have been specially designed so that the digital meter
readings can be adjusted to fit parts-per-million (ppm) units following
the Lambert-Beer Law of optics, as:
M = Meter Reading
modular optical cell includes the pressure seal, window, collimating
optics, air purge vent and a unique 4-gasket sealing system that prevents
moisture migration into electrical conduits; protecting against false
readings and preventing equipment damage.
modular optical cells contain all the elements that may he optically
degraded or severely coated by the process, e.g., windows and gaskets. The
optical cells may he removed, cleaned and reinstalled in less than five
minutes, avoiding long down-times and costly delays associated with
temporary quick-removal cap allows the process line to operate while the
modular optical cells are removed.
KSA is factory-customized to spectroscopically measure specific chemical
concentrations based on their near-infrared or ultraviolet signatures.
Other McNab instrumentation is available to provide photometric analysis
of such items as turbidity – using monitors that measure with
nephelometric (scatter) and forward-scatter technologies for the
measurement of low-level turbidities (NTU, PPM, EBC, etc.) – as well as
color, high-level chemical concentration, optical density and others.
Contact McNab for more information.