Lightning Protection; Connecting To The Node; Connecting Sensors; 10-Pin Bulkhead Models (8800-8-2) - Geokon 8800-2-1A Instruction Manual

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3.1.2 Lightning Protection

Each VW (Vibrating Wire) channel is protected by a 230V gas discharge tube, followed
by a high-speed protector and a transient voltage suppression diode. Each TH
(Thermistor) channel is protected by a 230V gas discharge tube, followed by an inductor
(lower resistance than high-speed protectors) and a transient voltage suppression diode.
(See Section A.3 for complete specifications).
In order for these components to divert energy from a lightning strike safely to ground, a
solid electrical connection to earth ground needs to be made. A copper grounding rod, (at
least six feet in length,) should be driven into the soil to a minimum depth of three feet, as
close to the Multiplexer as possible. Alternatively, any other suitable attachment to earth
ground may be utilized. Connect the grounding rod to the copper grounding lug on the
exterior of the Multiplexer with a large gauge wire (12 AWG or larger). This will provide
a suitable path from the Multiplexer to ground in the event of a lightning strike.

3.2 Connecting to the Node

A Multiplexer can be added to a Node at any time; it will be detected and utilized automatically.
Install the lithium D cells into the Node that the Multiplexer will be connected to by following
the instructions in Section 2.5. Connect the Node to the Multiplexer by using a model 8032-5,
10-pin to 10-pin patch cord (sold separately). Align the grooves of the connector on the cable
(male), with the connector on the unit (female). Push the connector into place until seated and
then twist the outer ring of the male connector until it locks into place.

3.3 Connecting Sensors

3.3.1 10-pin Bulkhead Models (8800-8-2)

Sensors are attached to the Multiplexer with 10-pin Bulkhead connectors. Align the
grooves on the sensor connector (male), with the connector on the unit (female). Push the
connector into place and then twist the outer ring of the male connector until it locks.

3.3.2 Cable Gland Models (8800-8-1 and 8800-8-3)

1) Open the Multiplexer by loosening the four captive screws on the front of the
enclosure and removing the lid. Make sure that no dirt, water, or other
contaminants are allowed to enter the enclosure.
2) Loosen cable gland nuts and remove the white plastic dowels. To prevent
contaminants from entering the enclosure, dowels should be left inside cable fittings
that will not be used.
3) Thread the transducer cables through the cable fittings. (For simplest cable
management inside the enclosure, transducer cables should be wired sequentially,
from left to right, top to bottom.)