Chemical Engineering May 2012 - 24

Mettler Toledo
Equipment News Roundup
plug-in connections with integrated
intelligence that allows data relating
to the process and sensor to be saved
and put to further use in the plug-in
head. This means that the sensors can
be calibrated centrally in a laboratory
under constant and ideal conditions.
Non-contact digital signal transmission
optimizes pH measurements and
prolongs the operating life of the sensor
by up to 40%, says Tracy DoaneWeideman,
U.S. product manager for
analytics with Endress +Hauser.
In situ-sensing
Meanwhile, there's also an increasing
demand for in-process sensors of all
kinds. " Customers are realizing the
cost benefits of taking measurements
directly in the process rather than
using sample extraction and conditioning
equipment, " says Jean-Nic Adami,
head of business development for gas
analysis with Mettler Toledo. " And because
safety is always a concern when
it comes to gas monitoring, in-situ
oxygen sensors are preferred because
they have a very rapid response. "
For
these reasons sensors that
employ laser technology for gas
analysis are attracting a lot of
attention, particularly now that
such sensors have become more affordable.
Tunable diode-laser (TDL)
spectroscopy detects how much light
has been absorbed from a narrowfrequency
laser source as it passes
through the gas stream, says Adami.
From this, the sensor's analyzer can
determine how much of a particular
gas is present. Most TDL systems
are of a cross-duct design, which necessitates
careful alignment between
the laser source and the detector; but
newer designs feature a probe attached
to the laser source that reflects
it back to the detector, so alignment is
not required.
Compared with traditional sensors,
Mettler Toledo's EasyClean
automated cleaning and
calibration systems optimize measurement
performance and reduce maintenance
load associated with these tasks
TDL sensors are easier to use, more
robust and can measure accurately
even if there's dust and moisture in
the gas, notes Adami.
Eric Bergles, vice president of sales
and marketing with BaySpec (San
Jose, Calif.), also sees demand for inline
process monitoring using specRegulations
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24 CHEMICAL ENGINEERING WWW.CHE.COM MAY 2012
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Chemical Engineering May 2012

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