11
Remote IR Monitoring
otherwise used in 10/100baseT Ethernet
systems. Various PoE congurations are
possible. Figure 6 depicts one in which
the power source is located at one end
of the network. (Gigabit Ethernet uses all
available data pairs, so PoE is not possible
with these systems.)
PoE eliminates the need for a separate
power source and conduit run for
each camera on the network. The
only additional cost is for some minor
electrical hardware associated with PoE.
Many applications encompass areas that
exceed the maximum Ethernet cable
run of 100m. In those cases, there are
wireless and beroptic converter options
that provide o-the-shelf solutions
for communicating over much greater
distances. These are frequently used in
the bulk material storage applications
described below.
Additional Asset Monitoring Situations
Bulk Material Storage. Many bulk
materials are stored in open yards where
air and moisture can help promote
decomposition and other exothermic
reactions that raise the temperature of
the pile. This brings with it the threat
of re, direct monetary loss, and safety
issues for personnel. In addition, there
is the risk of consequential damages
caused by res, including loss of nearby
property, water damage resulting from
re-ghting, and production shutdowns.
Materials that are especially prone to
spontaneous combustion include organic
wastes (compost, etc.), scrap paper
for recycling, wood, coal, and various
inorganic chemicals, such as cement and
chlorine hydrates. Even in the absence
of spontaneous combustion, many
bulk materials like plastics pose a re
hazard due to sparks or other external
ignition sources.
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