12.4 Interstitial Sensor
Interstitial Sensors can be installed around the inside perimeter of the
retaining wall or “snaked” under the length of an above ground
storage tank within the retaining wall area.
Interstitial Sensors can also be installed in manways, in trenches or
inside a sump.
12.4.1 Interstitial Sensor Installation
1. Place the Interstitial Sensor in its intended location.
When installing the sensor in a sump, place the
sensor at the bottom of the sump.
2. Connect the sensor to the I.S. Barrier by splicing the
sensor wires to field wires. These wires, in turn, pass
through vapor seal-offs and enter the VSmart Module.
3. Keep track of sensor-wiring identity to ensure proper
wiring at the VSmart Module. A below-grade wiring
workbox can be used as a junction box for the splice
when wiring underground. Follow all applicable
codes.
4. Run separate wiring from each sensor to the chain
leading to the VSmart Module if using the multi-drop
connection method; otherwise, run separate wire for
each sensor.
NOTE: Probe cables and sensor wiring can share the same conduit.
Keep track of sensor-wiring identity to ensure proper wiring at the I.S.
Barrier.
Figure 12-2 Interstitial Sensor Installed in AST
Figure 12-3 Interstitial Sensor Installed in Manway
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