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The GC-to-PC interface provides the user with the greatest capability, ease-of-use, and
flexibility. MON2020 can be used to edit applications, monitor operations, calibrate
streams, and display analysis chromatograms and reports, which can then be stored as
files on the PC’s hard drive or printed from a printer connected to the PC.
WARNING!
Do not use a PC or a printer in a hazardous area. Serial ports and Modbus communication links
are provided to connect the unit to the PC and to connect to other computers and printers in a
safe area. Failure to follow this warning may result in injury or death to personnel or cause
damage to the equipment.
1.2.3 Sample conditioning system (SCS)
The optional sample conditioning system is located between the process stream and the
sample inlet, which is often mounted below the GC. The standard SCS configuration
includes a stream switching system and filters.
1.3 Functional description
A sample of the gas to be analyzed is taken from the process stream by a sample probe
installed in the process line. The sample passes through a sample line to the SCS where it is
filtered or otherwise conditioned. After conditioning, the sample flows to the Analyzer
Assembly for separation and detection of the gas components.
The chromatographic separation of the sample gas into its components is accomplished in
the following manner. A precise volume of sample gas is injected into one of the analytical
columns. The column contains a stationary phase (packing) that is either an active solid or
an inert solid support that is coated with a liquid phase (absorption partitioning). The
sample gas is moved through the column by means of a mobile phase (carrier gas). The
selective retardation of the components takes place in the column, causing each
component to move through the column at a different rate. This separates the sample into
its constituent gases and vapors.
A detector located at the outlet of the analytical column senses the elution of components
from the column and produces electrical outputs proportional to the concentration of
each component.
Note
For additional information, see Section 1.4.
Output from the electronic assembly is normally displayed on a remotely located PC or a
printer. Connection between the GC and the PC can be accomplished via a direct serial
line, an optional ethernet cable, or via a Modbus-compatible communication interface.
Several chromatograms may be displayed via MON2020, with separate color schemes,
allowing the user to compare present and past data.
Introduction
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