DETector Engineering
&
Technology. inc.
486 N.Wiget Lane,Walnut Creek, CA 94598USA
DEl
telephone: (925) 937-4203
fax: (925) 937-7581
e-mail:
innovations in chemical detection
DETECTORHARDWARESTRUCTURES by DET
(visit
DET
at Pittcon
2011,
booth
4078)
GCOETECTORTOWER CONFIGURATIONS:
NPOITIO/FIOTower Structure - This type of detector structure includes a ceramic tipped jet
and a tower assembly that positions an ion source and collector electrode in close
proximity to the top of the jet. Selective NPOand TIO, and universal FlOmodes of detection
are available depending on the choice of ion source element and the detector gases.
NPOITIO/Remote FlO Tower Structure - This type of detector structure includes awide bore
jet, and a tower assembly that positions the ion source and collector electrode several
centimeters downstream of the top of the jet. The internal diameter of the jet is sufficient to
allow fused silica columns of 0.53mm diameter or less to be inserted clear through the jet.
For NPO and TIOmodes of detection, the GC column is terminated above the jet in close
proximity to the ion source/collector. For the Remote FlOmode of detection, the column
end terminates right at the top of the jet, a self-sustaining flame is ignited at the jet, and
long lived ions formed in the flameare carried downstream to the ion collector.
NPOITIO/Remote FIO/FTIOTower Structure - This type of detector structure is similar to the
Remote FlO structure except it has an additional Ion Suppress electrode located near the
top of the flame jet. The purpose of the Ion Suppress is to prevent ions formed in a flame at
the jet frommoving downstream to the ion collector. Remote FlOdetection is also achieved
by turning Off the Ion Suppress voltage.
NPOITIO/PTIOTower Structure - This type of detector structure is similar to the Remote FlO
structure except it has a small restricted internal diameter between the jet and ion source
that produces a high gas velocity to prevent a flame front formed at the hot ion source from
flashing back to a self-sustained flame at the jet.
Tandem TIO
&
Tandem TIO/FIO Tower Structure - This detector structure consists of 2
detection stages coupled together in a series combination. The first stage is either an
NPOITIO/FIO tower or Remote FlOTower each modified with an auxiliary gas flow input to
sweep any dead volume between the 2 stages. The second detection stage can be either an
NPOITIO transducer or an FlO transducer. In the case of an FlO transducer in the second
stage, another auxiliary gas input is provided to achieve the appropriate fuel mixture for a
self-sustaining flame.
STAND-ALONEOETECTORSTRUCTURES:
OET tower structures can be configured with various choices and sizes of either Swage or
Tube Inlets and Outlets for use as stand-alone transducers. A mounting flange is available
to attach to the transducers, as well as Aluminum heater blocks. A transducer attached to a
heated inlet reactor is used in OET's Reactor Thermionic Ionization Analyzer (RTIA)module
for selective screening applications.
Website :
E-mail :
TelNo : 03 9762 2034 . . . inAUSTRALIA
