4.1.1 Grounding the SiteSentinel iTouch Tank Gauging System
There are two ground lugs within the SiteSentinel iTouch (see Figure 4-4 below). You will need to install two
continuous ground wires (green 12 AWG or larger) from both ground lugs connected back to the distribution
panel ground. The intrinsic barriers rely on these ground connections; if they are not present the barriers will
not work. The redundant ground ensures that the SiteSentinel iTouch will operate properly and safety.
Figure 4-4 SiteSentinel iTouch Controller Ground Lugs
4.1.2 SiteSentinel iTouch Port Protection
The communication ports can be damaged by ground faults within the SiteSentinel iTouch. If you are
communicating from another type of system, such as a point-of-sale (POS) system, to the SiteSentinel iTouch
and there is a slightly ground potential difference, this difference will either cause immediate failure of the
SiteSentinel iTouch, or will cause a failure over time. To eliminate this possible damage, make sure the other
equipment is grounded back to the same ground potential as the SiteSentinel iTouch at the distribution panel.
In addition, a 12 AWG or larger wire can be run from the ground lug in the SiteSentinel iTouch to the ground of
the other equipment.
OPW Fuel Management Systems can provide an external surge suppressor (Part #: 75-0104). This device will
help protect the ports from power surges or lightning strikes.
Figure 4-5 External Surge Protector
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