DSE Model 5310 Automatic Mains Failure & Instrumentation System Operators Manual
58 Part No. 057-013 5310 OPERATING MANUAL ISSUE 7.1 18/06/2007 ADM
The resistive fuel level senders supported by the 5300 series controllers are devices that translate fuel level into
resistance. A change in fuel level translates directly to a change in the resistance of the sender. In the case of a
parallel sided fuel tank, an accurate measure of the fuel level can easily be made, however as shown in the
example below, this is not the case with non-parallel sided fuel tanks. Therefore it is recommended that only
parallel sided fuel tanks are used to ensure correct fuel level detection.
The fuel sender measures
the distance between the top
of the tank and the fuel level.
Typically, they use a ball
float.
In this example, the distance
between the top of the tank
and the level of the fuel is
50% of the height of the
tank. The fuel level sender
will report the tank correctly
as being 50% full.
For a parallel-sided tank like
this one, 50% distance
between the top of the tank
and the level of the fuel will
occur when the tank is 50%
full of fuel.
In this example, the distance
between the top of the tank
and the level of the fuel is
again 50% of the height of
the tank, the fuel level
sender will report the tank as
being 50% full.
However, as the bottom of
the tank is curved, the actual
amount of fuel in the tank is
only about 40%. The fuel
sender is incorrectly
reporting the amount of
remaining fuel.
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