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95-8714
6.3
Areas Prone to Earthquakes
In the event of an earthquake, there is a chance
that the modules will become misaligned with
respect to each other. As long as the modules
do not suffer from direct mechanical impact
damage during an earthquake, they should
remain undamaged by such events. After an
earthquake, it is recommended that the system
alignment be checked. Anti-vibration mounts
are unlikely to be of any benefit and are not
recommended.
Misalignment by Accidental Impact
Locations where there is a significant likelihood
of equipment, personnel or moving objects
accidentally knocking the modules out of
alignment should be avoided where possible.
If such locations cannot be avoided, measures
including improved mechanical protection and
warning notices should be considered.
MODULE MOUNTING RECOMMENDATIONS
LS2000 modules must be affixed to a solid
structure capable of supporting a minimum of
100 lbs. (46 kg) located within the system’s rated
separation distance. The vibration in the structure
should not exceed the specifications in the
following standards:
•
FM6325
•
UL/FM 60079-29-4
(previously ANSI/ISA 12.13.04)
•
EN/IEC 60079-29-4
•
Class Guideline DNVGL-CG-0339
A building wall, a heavy steel
I
-beam, or nearly
any type of masonry typically provides the most
rigid mounting surface available. However, avoid
the use of wood structures or supports if the
possibility of warping exists.
When using a vertitcal post a square stock pole
is recommended.
The post can be set into the ground or attached
to a secure surface. If a post is set into the
ground, the portion below grade should be set in
concrete at least 1 meter deep.
IMPORTANT
In all cases, consider whether additional
bracing or support is needed to ensure
the structural integrity of the module
installation. See Figure 8. Remember
that accurate module alignment is
essential for proper performance of a
line-of-sight gas detection system.
Movement may have a detrimental effect
on alignment. This is especially true
for installations with significant module
separation distances.
Module mounting options include:
• A vertical or horizontal post with a nominal
outside diameter of 4.5”, 11.43 cm.
Acceptable outside diameter range is 4–4
5/8”, 10.16–11.75 cm. See Figure 9.
• For flat surface mounting, refer to Figure 10.
NOTE
Anti-seize material (provided) must be
applied to the U-bolt threads at the time
of installation to prevent galling.
NOTE
To ease installation and future removal,
all threaded covers, stopping plugs,
and thread adapters must be installed
using thread lubricant. See the “Ordering
Information” section for part number —
avoid the use of silicone grease. For
devices with NPT threads, Teflon tape or
thread seal lubricant must be used for
enhanced sealing capability. A minimum
torque of 20 foot-pounds is required to
maintain ingress protection. To maintain
the IP or NEMA ratings when using NPT
stopping plugs, one to three wraps of
Teflon tape is required.