Teledyne GC-Pro/TCD - Gas Chromatograph - Manual (Page 27)

GC-Pro TCD Operational Theory
Teledyne Analytical Instruments 13
to the restrictor fitting either on the optional auto calibration module or
the span inlet on the rear panel.
The Piping Diagram for the standard instrument is shown in Figure
2-2. A 10-port 2-position GC sampling valve is used to control and
direct gas flows including sampling, back flush, and carrier gas. The
fixed volume sample loop ensures the same volume of sample injection
in the column every cycle.
Figure 2-2: Typical Piping Diagram Used in the GC-Pro TCD
If your instrument is fitted with the optional auto calibration module,
a separate compartment containing of a pair of solenoid valves is
installed for controlling the introduction of sample or span gas to the
detector. Calibration can be performed automatically on a programmed
schedule or manually using the front panel interface.
Other detector options are available for the GC-Pro series instrument
which may alter the appearance of the front and rear panels and include
additional gas ports such as fuel and air for the FID option. These
options, if included, will be described in an accompanying addendum to
this manual.