Mag Probe Installation UST/AST Tank - Dedicated Riser
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Adaptor Nut on one end and the J-box on the other. Tighten the fittings until snug. Splice and seal the wires in
the J-box (see Probe Field Wiring on page 28).
Figure 15. Probe Installation Example - Underground Storage Tank
Legend for numbered boxes
1 Riser cap and cord grip
2 14-inch diameter or larger manhole
3 Probe cable
4 Cord grip seals
5 Weatherproof junction box with 1/2” NPT threads (16 cubic inch minimum).
6 Seal off - epoxy seal per NFPA specifications
7 1/2-inch rigid conduit to console
8 Riser pipe: 2-, 3-, or 4-inch API schedule 40 depending on probe type (to prevent erroneous probe readings, install probe
riser a minimum of 24 inches from the submersible pump)
9 Top view of split ring collar (P/N 576008-617) - required if probe enters riser,i.e., when probe length exceeds tank diameter.
10 Side view of optional split ring collar
11 Tank
12 Water float (Magnetostrictive probe rests against bottom)
13 Product float
14 14" minimum for global mag plus/mag plus probes. When installing a probe longer than the tank diameter, increase this
minimum dimension to compensate. (Example: a 7'-6'' diameter tank will use an 8' probe, in which case you must add 6" to
minimum riser length 'A', i.e., 20").
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