Installation
Scully Signal Company
6
SENSING LEVEL - HEIGHT ADJUSTMENT
The SP-FU sensor’s sensing level is marked on the sensor with an arrow on the prism protector. Adjust
the sensing level by loosening the extension shaft locking screw located inside the sensor holder.
After loosening the lock screw, slide the sensor shaft up or down using a twisting motion. Sensor Outline
Drawing shows the adjustment range for a standard sensor shaft length of 7-inches. Longer shaft lengths
and a 1 3/8-inch high cap are also available. Consult Scully for part numbers. Care must be taken that
the cap does not exceed height specifications for the construction of the tank.
The sensor shaft length may be shortened if necessary. See instructions following.
CAUTION: The liquid level sensing point for an overfill prevention sensor is generally set at a
point 1/4” to 1/2” above the compartment's normal fill capacity (marker). When setting this
level, it is important to take into account the ullage remaining in the compartment and the
emergency shutdown times at the terminals where the vehicle will be loading. If insufficient
ullage remains above the overfill prevention sensor's sensing level to contain the excess
product which will flow into the compartment, a spill CAN OCCUR before the flow completely
stops.
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