Franklin Fueling Systems Tank Sentinel (TS-1001, 2001, 504, 508 & 750) Installation - Manual (Page 24)

TANK MEASUREMENTS Page 3 - 1 3
3 Tank Measurements
Before Backfilling
In order to achieve the highest possible accuracy from the Tank Sentinel system, a
number of tank measurements must be made before the tank excavation is
backfilled. This data is used to calculate the tank tilt offset for tanks that are not
level. The best method uses calculated product and water offsets that virtually
“moves” the probe to the center of the tank. If the probe is mounted in the center of
the tank, then no corrections are required (offsets = 0.0). Alternatively, if the data
to calculate tank tilt is not known, or if the tank is not seriously tilted, then use +/–
offsets to adjust the probe readings to match the stick readings at fill.
Figure 3 - 1 shows the tank tilt formula to use when the fill tube and probe are on
opposite sides of the tank center-line. Figure 3 - 2 shows the formula to use when
the fill tube and probe are on the same side of the tank center-line.
Product Codes: T1 = TS-1001, T2 = TS-2001, T4 = TS-504, T7 = TS-750, T8 = TS-508,
none = all products
Figure 3-1. Typical Tank – Fill & Probe on Opposite Sides of Tank Center
Tank shown
tilted
LENGTH OF TANK
WATER
" XF " " XP "
CENTER OF TANK
Fill
level
Probe
TOP OF TANK
TANK
DIAMETER
" LF "
Level
at Fill
L
C
DROP TUBE
" LP "
Level
at Probe
PRODUCT
LEVEL
FUEL
FUEL
Fill & Probe on
opposite sides of
Tank
Center...
Product / Water
Offset =
XP + XF
C
L
(LF - LP) * XP
AIR