Vaporizer accessory for injection of LPG,
refrigerants andother Pressurized liquids
TheVaporizer is connected to the 10port
gas sampling valve ( GSV ) which is also
mounted in the heated valve oven.
The pressurized liquid is connected to the
Liquid IN port ( a 1/8” Swagelok fitting ).
The pressure forces liquid sample to flow
through a restrictor tube ( a coil of 10 feet
of stainless steel tubingwith an internal
diameter of .005” ). The flow rate of the
liquid is slow, about 30microliters permi-
nute ( 30ul/min ). When the liquid reaches
the heater at the endof the tubing it ex-
pands to a gas. The flow rate of the gas
is about 30ml/min since the liquid expands
by about 1000 timeswhen it evaporates.
The heater has a volume of about 10ml so
the expanding gas has plenty of time to
mix and homogenize before flowing
through the loop of theGSV and then out
to the exit fitting.
If the sample is already a gas, or you do
not want the gas to contact the hot surfac-
es of the heater, then connect to theGas
IN port instead. This port flows directly to
the loop. Whichever of the two inlets is
chosen, the othermust be capped off with
aSwagelok fitting.
SRI TechSupport: 310-214-5092
Page 2
Loop
Tee
Exit
Liquid IN
Gas IN
Restrictor
Heater
10port Gas
SamplingValve
