Emerson Rosemount 370XA, Справочное руководство системы

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System Reference Manual 370XA Gas Chromatograph
7P00370-H01 APRIL 2014
6 - 2
The following table lists some common problems along with their
solutions:
Problem Solution
A single stream cannot be selected
for analysis but other streams can, or
one stream appears to be
contaminating other streams. “Replace a stream selection solenoid” on
page 6-2
An analytical valve is not actuating
correctly. “Replace an analytical valve solenoid” on
page 6-5
The retention times for the
components have shifted later in the
analysis run, or valve switching
noise is excessive. “Overhaul an analytical valve” on page 6-
7
The un-normalized total is erratic
and fluctuates with changes in the
sample pressure. “Overhaul the sample shut-off valve” on
page 6-22
The module is contaminated by a
large amount of liquids, or the
response of the detectors has
dramatically reduced. “Replace the detectors” on page 6-31
The analyzer has been exposed to
significant contamination that
resulted in a reduction in the
separation of the components. “Replace the chromatograph columns”
on page 6-37
If the carrier gas pressure is not
being controlled or there is
excessive drift on the baseline, the
carrier gas pressure control valve
should be replaced. It may be difficult to diagnose whether
the issue is with the pressure control
valve or the pressure sensor, so it is
recommended to replace both if there is
a problem with the carrier gas pressure
control.