System Functions
3
3.1 Chromatography Overview
Gas Chromatograph Terminology
The following are some of the terms that are used in this manual.
Application: The supporting hardware and software required to perform the analysis.
Supporting hardware consists of hardware channels: detector channel, Solenoid Valve Control
Module channel, Electronic Pressure Control channel, Temperature Controller. Streams are
defined to applications. If there are 3 or 4 simultaneous streams, they are defined as a single
group called a Method. Applications can run only one Method at a time. Two applications can
run if there are two cycle clocks in the Maxum II.
Method is the part of the application that contains the parameters for controlling the hardware.
Methods control the hardware associated with an Application. The method controls the
hardware, including all cycle-clock timed events. Methods are defined to streams. That is,
several stream sequences can make up one Method. Methods also control the integration and
calculations of the chromatogram. There is one cycle clock per method.
Applet refers to pre-engineered chromatographic segments of common applications, which
have been optimized and standardized.
Applet Module refers to a complete assembly including Model 50 valve(s), detector and
interconnecting tubing all mounted as a single module. The module includes columns and
restrictors
Parallel Chromatography
With the Maxum II hardware and software, a complex single-train chromatograph analysis can
be broken it into multiple simple trains. Each simple train then runs simultaneously – in parallel.
This parallel chromatography procedure simplifyies the overall analysis and increases
reliability.
Redundant Measurements
Using parallel chromatography can reduce calibration requirements by running two identical
modules in parallel on the same stream to obtain redundant measurements. As long as the
results remain the same within a predefined error limit, the analysis is known to be accurate.
Deviations outside the error limit can trigger notification or activate analyzer calibration.
Overall, the Maxum II calibration requirements are significantly lower because of the parallel
measurement configurations and standard modular applications.
Maxum edition II Analyzer General Maintenance
Manual, August 2018, A5E42019842001 9
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