5.13
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 (Figure 5-13 and Figure 5-14).
Interstitial Sensors can also be installed in manways (Figure 5-14), in
trenches or inside a sump.
5.13.1 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 VSmart Module 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.
Probe cables and sensor wiring can share the same conduit. Keep
track of sensor-wiring identity to ensure proper wiring at the VSmart
Module.
Figure 5-13 Interstitial Sensor in Aboveground Tank
Figure 5-14 Interstitial Sensor Installed in Manway
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