5.10
Discriminating Interstitial Sensor
Part No. 30-0236-LW
The Discriminating Interstitial Sensor (Figure 5-10) utilizes a solid-state
optical technology to detect the presence of fluid in the annular space of
a tank, and conductive probes to distinguish fluid type (water or
hydrocarbons). Detection of liquid will result in an alarm condition, as will
a break in the cable or sensor malfunction.
*Maximum Wiring Length is the maximum length of cable to be used
to connect all sensors on an individual channel. This length includes
run of cable from VSmart to each sensor board in the string.
5.10.1 Installation
1. Measure the length of the annular space-monitoring pipe
from top to bottom and subtract 1/2” (1.3 cm) for a total
measurement to be used for sensor placement.
2. Measure from the sensor tip along the sensor cable the
length calculated and mark with tape or marker.
3. Position the sensor into the monitoring pipe until the tape
mark is even with the top of the pipe.
4. The sensor should not touch the bottom of the monitoring
tube to prevent false alarms.
5. Connect the sensor wires to the field wires in the junction
box using the supplied wire nuts.
6. Seal the electrical connections with the epoxy seal pack.
Figure 5-10 Discriminating Interstitial Sensor
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