1.17 Calculating Tank Tilt and Offset Factor
You can calculate a product offset for a probe that is not installed in the center of a “pitched” tank. Pitch is the
tilt of a tank along its horizontal axis. Some tanks are intentionally installed with one end lower than the other.
This allows water and sediment to collect at the low end, while clear product is drawn from the high end. Pitch
can also be caused by tank settling. The rate of pitch can be measured by using a dipstick to measure the level
of product at two points (preferably opposite ends) of the tank (see illustration below). The product depth at the
deep (lower) end of the tank is value “A”. The product depth at the shallow (higher) is value “B”. The distance
between the two measuring points is “C”.
Figure 8-1 Calculating Tank Tilt
The formula for pitch is: (A-B)/C
For example: [(46” – 40”)/120”] = (6/120) = 0.05
To calculate the product offset, measure value “D”, the distance of the probe from the center of the tank. The
formula for product offset is “D” x pitch. For the example above, 36” x 0.05 = 1.8”
If the probe is located closer to the shallow end of the tank, the product offset is positive; for the example, 1.8. if
the probe is located closer to the deep end of the tank, the product offset is negative; for the example, 1.8.
See SiteConnect Help for details about entering the product offset.
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