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LSIV cross sectionFigure 1-5:
The LSIV penetrates the wall of the lower compartment and is held in place by a retaining
ring. The mounting arrangement is designed to ensure integrity of the flameproof
enclosure.
The outermost end houses an air-operated piston. Air at 60 PSI is directed by a solenoid
valve to either advance the stem to inject the sample or to retract the stem.
The next section houses sample input connections and stem sealing components. There
are two 1/8-inch O.D. tubing ports in this section; one port is for sample input, the other is
the exhaust for sample flow.
Within the enclosure cavity are the flash chamber components surrounded with insulating
covers. At working temperatures, the surfaces of these covers become very hot to the
touch.
The tip of the cylindrical flash chamber is the port where flashed sample is taken to the
oven system.
The port near the outer diameter of the end of the heated flash chamber block is the input
for carrier gas.
The flash chamber block is stainless steel and is surrounded by an insulating mounting
adapter. It houses the heater and an RTD.
1.5.4 Methanator
After all other components have been separated from the sample, carbon monoxide and
carbon dioxide, which are normally present in quantities too small to be detected by the
GC, can be sent through the optional methanator, where the two gases are combined with
hydrogen to make methane in a heat-generated catalytic reaction. The methanator is also
known as a methanizer or a catalytic converter.
Introduction
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