Honeywell Vertex M Technical Handbook page 243

Vertex M 24-Point Continuous Monitor
TM
any measurements. An LIT causes monitoring to
be interrupted for about two minutes because of
synchronization delays.
The test is not compatible with shared sample lines.
The use of external filters is mandatory with Vertex
M LIT as it is with all Vertex M points.
Specifications and Section B.2 Filter Compatibility
contains guidance on filter selection.
Quantitative Performance
The pressure at the pump inlet must be less than -7.0
in Hg or the test will be inhibited. The sample line must
be 4.8 mm ID [thin wall or 0.190 inch ID] and have a
length of 90 meters or less. This supersedes table B-2
in Appendix B, Specifications.
The total gas flow (transport plus sample) is typically 1.3
liters per minute per point. This results in a differential
pressure of about 1.2 in. Hg with the maximum tubing
length. The check valve increases the differential
pressure by an additional 1.0 in. Hg for a total of about
2.2 in Hg.
During characterization the differential pressure must
be 0.8 in. Hg or more or a fault will be issued. During LI
testing the differential pressure must be at least 70%
of the characterization differential pressure or more
or a fault will be issued. Leaks of 1 mm [0.039 inch]
diameter or larger will cause a substantial decrease in
the differential pressure and the generation of a fault.
The LIT measurement requires that the total pressure
variance of the sampled point, the Vertex M rack and
the exhaust outlet must be less than 0.3 in. Hg. for
correct operation. See
Appendix A - Line Integrity Test Option
Appendix B
Figure H-2.
Software Overview
Automatic LI tests can be scheduled to take place at
any of the times when a time weighted average (TWA)
is recorded. TWAs are recorded every eight hours so
that up to three LI tests can be performed per day. As
with previous software, the time of the TWA can be
shifted up to eight hours so that the LI test time can
be any time of day. The LI test can be disabled on a
per-point basis to permit a rack with LIT to have some
tube configurations that are incompatible with LIT.
Buttons are provided to start an LI characterization or
an unscheduled test. These two buttons are on the RS
View "Authorized Service" screen.
Accessing LIT Parameters
A checkbox on the Configure Point screen as highlighted
by the red rectangle in Figure H-2, enables the selected
analyzer to participate in the LIT. By default, all
analyzers purchased with this option will participate.
Clearing this checkmark removes the analyzer from the
LIT and prevents the generation of LIT-related faults for
the associated point. Otherwise, nuisance faults may
be generated for points with incompatible external
components. Examples include tubes longer than 90m,
medium-walled tubing, and shared sample lines.
H-3