
10
Splice kits recommended by Geokon incorporate casts, which are placed around the splice and
are then filled with epoxy to waterproof the connections. When properly made, this type of splice
is equal or superior to the cable in strength and electrical properties. Contact Geokon for splicing
materials and additional cable splicing instructions.
Cables may be terminated by stripping and tinning the individual conductors and then connecting
them to the patch cord of a readout box. Alternatively, a connector may be used which will plug
directly into the readout box or to a receptacle on a special patch cord.
2.6 Lightning Protection
The Model 6350 Tiltmeter, unlike numerous other types of instrumentation available from
Geokon, does not have any integral lightning protection components, i.e. transzorbs or plasma
surge arrestors. Usually this is not a problem. However, if the instrument cable is exposed, it may
be advisable to install lightning protection components, as the transient could travel down the
cable to the gage and possibly destroy it.
Note the following suggestions:
•
If the tiltmeter 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 installation of these components.
•
Lighting arrestor boards and enclosures are available from Geokon that install near the
instrument. 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 this enclosure and earth ground to facilitate the passing of
transients away from the gage. See Figure 8. Consult the factory for additional information
on these or alternate lightning protection schemes.
•
Plasma surge arrestors can be epoxy potted into the gage cable close to the sensor. A ground
strap would connect the surge arrestor to earth ground, either a grounding stake or other
suitable earth ground.
Figure 8 - Lightning Protection Scheme
Terminal Box/Multiplexer
Instrument Cable
LAB-3 Enclosure
LAB-3 Board
Model 6350 Tiltmeter
Wall
Ground Connections
Surface
(usually buried)
Summary of Contents for 6350
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