INJECTORS
PTV -ProgrammedTemperatureVaporization Injector
Overview
TheProgrammedTemperatureVaporization (PTV)
injector iscomposedof thesamepartsas theHeated
Split/Splitless injector: the injector body, a
SilcoSleeve
TM
liner, an injector purge restrictor, a
precisionneedlevalve for adjustment of split flow
rate, a split flow solenoid that turns on&off from
thePeakSimpledatasystem,andanaluminumheater
block containing a heater cartridge and Type K
thermocouple. Contrastedwith the Split/Splitless
injector, thePTV injectorhasaremovable insulating
sleeve, a larger (250 watts) heater cartridge with
ballistic heating capability, and carrier flowON/OFF control. The SilcoSleeve
TM
liner can be packed
with a variety of optional adsorbents, depending on the application. The SRI PTV injector has three
modesofoperation:
1)
largevolume liquid injector,
2)
anoffline thermaldesorber,or
3)
anonline thermal
desorber inconjunctionwithagassamplingvalve.
Injector body
SilcoSleeve
TM
liner packedwith adsorbent
Standard Split/Splitless capillary adapter & liner
PTV and Split/Splitless injector components
Split flow exits to purge
vent and needle valve
Tenax-GR
TM
packed
SilcoSleeve
TM
liner,
partially slid out for visibility
Front of ValveOven andColumnOven - top view
Sample loop inlet (top)
and purge vent (bottom)
Needle valve
precision control
Aluminum heater block
End fittingwhere column connects or, as in this SRI
MultipleGas Analyzer #1, tubing to a gas sampling valve
Carrier gas inlet tubing
Column Oven
wall
Septum nut
and septum
Tubing to gas
sampling valve
