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Overview/General operation GPro™ 500 TDL Series
Overview
Process gas analyzers are used for continuous determination of the concentration of one or more gases in a gaseous
mixture. The concentration of gases in a process is decisive for the automation and optimization of processes to
ensure product quality.
The fast measurement of gas concentrations directly in the process is the main advantage of in-situ diode laser gas
analyzers. This is because in-situ analytical procedures feature physical measurements directly in the actual
process. In contrast to extractive gas analysis no sample needs to be extracted, conditioned and routed into the ana-
lyzer via a sample line. Alternatively the GPro 500 can be installed in a bypass line with respect to process acces-
sibility for manual intervention, process temperature, pressure and/or geometry of the measurement location. An
analyzer carrying out in-situ measurements must always take into account changing process conditions and be able
to automatically compensate for them. Therefore, accurate temperature and pressure compensation is highly rec-
ommended. Also, extreme ruggedness of the system is important since it is in direct contact with the process gas.
The GPro 500 gas analyzer offers compact, probe type, service-friendly design with simple operation and excep-
tional performance data. It is extremely rugged, requires little maintenance and provides high availability. The GPro
500 remains uninfluenced by a wide range of process temperatures and/or varying concentrations of dust (particles)
in the gas. These features, together with fast measurements mean that diode laser gas analysis with the GPro 500
is a very valuabla alternative to established extractive methods.
General operation
GPro Series is a gas analyzer employing a unique, three-line molecular absorption spectroscopy called Spectra
lD
™.
A diode laser emits a beam of near-infrared light, which passes through the process gas and is then reflected back
into the detector by an optical device that is situated and the end of the probe. The wavelength of the laser diode out-
put is tuned to a gas specific absorption line. The laser continuously scans the three discrete absorption lines with a
very high spectral resolution. For analysis, absorption, strength and line shape of the return signal is used. The influ-
ence of cross interferences from background gases is negligible, since the wavelength specific laser light is absorbed
very selectively by only one specific molecule. The minimum detectable limit, the accuracy and the resolution is
dependent on the probe length (optical path length), the process temperature and pressure.
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