Franklin Fueling Systems Tank Sentinel (TS-1001, 2001, 504, 508 & 750) Installation - Manual (Page 32)

5 Page 5 - 2 TANK SENTINEL ® INSTALLATION GUIDE
WARNING All wiring must enter the Tank Sentinel ® enclosure through the
designated knockouts. Use only those knockouts labeled “Intrinsically Safe Probe
and Sensor Wiring Only” for liquid level probe and leak detection sensor wiring. An
explosion hazard may result if other openings are used.
Weather Proof Junction Boxes
You must install a weatherproof, electrical junction box inside each manhole.
They will be used to connect (splice) the cables coming from the console to leak
detection sensors, or to liquid level probes. Use sealing compound or gaskets at
each entry point to the junction box to maintain its weatherproof characteristics.
Junction boxes should have a minimum volume of 16 cubic inches (262.2 cubic
cm).
These junction boxes should be installed high on the side-wall of the manhole to
prevent them from being submerged during heavy rains. The recommended
probe cable type (and its outside diameter/O.D.) depends on the length of cable
run. The conduit size, and the type of junction box, size of the NPT (BSP)
openings, required is also affected by the length of the cable run / cable outside
diameter — see TABLE 7-1.
Conduit
The Probe and Sensor conduit may enter the manhole through its bottom or its
side. Install the conduit and the probe or sensor cord grip fittings at the lower
conduit fittings of the junction box (1/2” NPT, cable compression gland fittings
are supplied with all INCON probes and sensors). Reference Figure 5-1.
You will need 1/2” to 3/4” (12.7 to 19.1 mm) MF bushings for the 1/2” (12.7 mm)
NPT cord-grip (compression gland) fittings for junction boxes with 3/4” (19.1
mm) NPT conduit openings.
Installation Details
Reference Figures 4-1, 5-1, & 7-1. Dig trenches as necessary to install conduit
from each probe/sensor manhole to the console. Lay 1/2” to 3/4” (12.7 to 19.1
mm) threaded, conduit from each probe/sensor junction box to a metal,
weatherproof pull box. The metal, weatherproof pull box combines 1/2” to 3/4”
(12.7 to 19.1 mm) conduits from many probes and sensors, into one or more
1/2” to 3/4” (12.7 to 19.1 mm) conduit that is run to the Tank Sentinel console.
(Use unistrut and unistrut nut assemblies to secure all conduit runs as
required.)