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10
Suggested Lightning Protection Options:
•
If the gage is connected to a terminal box or multiplexer, components such as plasma surge
arrestors (spark gaps) may be installed in the terminal box/multiplexer to provide a measure
of transient protection. Terminal boxes and multiplexers available from Geokon provide
locations for the installation of these components.
•
Lighting arrestor boards and enclosures are also available from Geokon. These units install
where the instrument cable exits the structure being monitored. The enclosure has a
removable top to allow the customer to service the components or replace the board in the
event that the unit is damaged by a lightning strike. A connection is made between the
enclosure and earth ground to facilitate the passing of transients away from the gage. See
Figure 10.
•
Plasma surge arrestors can be epoxied into the instrument cable, close to the sensor. A
ground strap then connects the surge arrestor to an earth ground, such as a grounding stake or
the rebar itself.
Consult the factory for additional information on available lightning protection.
Figure 10 - Lightning Protection Scheme
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