DET
innovations in chemical detection
RTIA:
REACTOR THERMIONIC IONIZATION ANALYZER
Equipment:
RTIA modules are stand-alone units
containing a thermionic ionizat ion
transducer preceded by a heated reactor
chamber. Each module has a thermally
insulated, temperature controlled (50–
400°C) transducer and reactor,
and
supporting gas flow control elements as
needed. The transducer response is
determined by the type of thermionic
source used, and the type of gases
supplied. Available modes include TID-1–
Air(N
2 ),
TID-3-Air(N
2 ),
or TID-2·H
2/Air
and
TID-4-H
2/Air
(i.e., NPD). TID-1-Air is an
especially simple configuration in which the
operating gas may be ambient air drawn in
by a sampling pump attached to the module
exit port. Ion Source power for the
transducer in the RTIA module is provided
by a DET Current Supply, and signals can
be measured with a Keithley 6485
Picoammeter or equivalent.
Applications:
The RTIA selectively detects
electronegative or NP vapors which
thermally evolve from solid or liquid
samples. Applications include a direct
inject-vaporizeprocedure for liquid samples;
a desorb-detect procedure for solid
samples;
and a trap-desorb-detect
procedure for vapors in ambient air. The
TID-1 -Airmode detects nitrogen oxides and
halogen/halogen oxides evolved in the
thermal
oxidation of
food products,
fabricating materials, oil bearing source
rocks,
and contaminated soil/water
samples.
THERMIONIC
SOURCE
HEATING
CURRENT
AIR
POLARIZATION
VOLTAGE
ELECTROMETER
.....-- ION COLLECTOR
HEATED
REACTOR
GLASSWOOL
ORFRIT
GLASS TUBE
_ HYDROGEN (NPD)
ORCAPPED (TID-1)
DETector Engineering
&
Technology, inc.
