Siemens Maxum II Manual page 15

Sample Valve
The type of sample valve used in a Maxum II is application dependent. Five primary types of
sample valves are available.
● The first is the 10-port Model 50 valve that is designed for vapor sample only.
● The second is the Model 11 valve for vapor or liquid samples.
● Third is the Model 20 valve for liquid high-pressure samples.
● The fourth type is the set of Valco valves that are designed for high temperatures and very
low sample volumes.
● The fifth is the independently-heated Siemens Liquid Injection Valve.
The sample valve(s) and any column valves are controlled by a Solenoid Valve Control Module
located in the Maxum II's electronics compartment. There can be up to three SVCMs installed
in an electronics compartment (EC).
Solenoid Valve Control Module
The Solenoid Valve Control Module (SVCM) provides pneumatic on/off control for both
sampling and oven systems functions. The SVCM manifolds are connected as a group of four
4-way and four 3-way solenoids. The (SVCM) receives commands from the I
commands are received from the SNE software module. Solenoid relay status is read back to
the SNE software module to indicate whether a selected solenoid is to be deactivated or
activated. Timing is controlled by SNE software module timing. There is no timebase in the
SVCM.
Commands from I
warning conditions have occurred, pressure control and SVCM status information is returned
to the SYSCON database.
Columns
Samples are injected by the sample valves into the chromatograph columns where the samples
are separated into individual components. Many different types of columns may be used
including 1/16-inch micro-packed, 1/8-inch packed and fused silica or metal capillaries. The
columns used are dependent on the requirements of the application.
Column Valves
In most applications, there are multiple columns in use that are typically switched by column
valves located in between them. These column valves are not shown in the illustration, but like
the sample valves described above they are also controlled by the Solenoid Valve Control
Module and SNE software module.
Maxum edition II Analyzer General Maintenance
Manual, August 2018, A5E42019842001
C bus control the deactivation or activation of solenoid valves. If fault or
2
System Functions
3.3 Analyzer Operation
C bus. Solenoid
2
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