SITRANS SL Gas Analyzer0 pages

© Siemens AG 2014

Process Analytics

SITRANS SL Gas Analyzer (TDLS)
Quick and reliable gas analysis under extreme conditions

The SITRANS SL sets standards for in-situ process measurements in harsh operating environments.
The gas analyzer is suitable for highly sensitive oxygen
and carbon monoxide measurements, and is based on the
tunable diode laser spectroscopy (TDLS) measurement
method. SITRANS SL works without any sampling and
sample-preparation systems. It also works effectively in
real time, extremely precisely, and largely free of pertur­
bing influences by accompanying gases, dust or aerosols.
The device can compensate for other influen­ ing factors,
c
such as pressure or temperature fluctuations. This makes
the gas analyzer the ideal tool for quick, contactless measurement of gas concentrations in process and flue gases.
It is designed for use in harsh and explosive environments
and reliably measures hot, dust-laden, corrosive, moist,
and toxic gases.

Built-in reliability and maintenance-friendliness
Drift phenomena that principally occur with diode lasers,
and which can lead to a loss of measurement quality and
normally make frequent inspections a necessity, are eliminated in the SITRANS SL. The use of an internal reference
gas cell facilitates stable and maintenance-free operation:
In the device’s optical path there is a cuvette, which is
filled with a reference gas that doesn’t interfere with the
sample gas. The reference signal is independent of the
sample gas concentration and monitored simultaneously
to the process measurement. This signal forms the basis of
comparison for stabilizing the laser and ensures that calibrations remain valid for an extremely long time. This long
lasting stability and the accompanying omission of frequent checks which would translate into downtime considerably increase availability and reduce operating costs.

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