Determining Mag Probe Length Determining Mag Probe Length for Media-Isolated Installations
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3. Measure from the top of the riser to the bottom of the tank and record this distance as “D2”.
4. Subtract “D1” from “D2”, then add 7 inches, to determine the correct probe length.
Figure 10. Determining Mag Probe Length for Installation in a Vapor Extractor Riser
Determining Mag Probe Length for Media-Isolated Installations
If tank’s inside diameter is unknown, perform the following procedure (ref. Figure 11):
1. Measure the distance from the inside bottom of the tank to the inside top of the tank (A).
2. Order a probe length of B (where B = A + 6”).
Figure 11. Calculating the Correct Mag Probe Length for Media-Isolated installation
Manhole Cover
(Backfill)
4" Riser
2" Manifold
Piping
Ball Float Check
Valve Assembly
Extractor Fitting ("T")
Extractor Cage Cross Pin
probes\vpr.eps
"D1" (25" min.)
"D2"
(to bottom
of tank)
(Concrete)
Bushing
Tank
AB
6"
Pump
probes\mediaiso.eps
A + 6" = Probe length (B)
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