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Fuel Tank A float system is used to measure fuel in a gas tank. The float is connected

to a gear and the gear is connected to a rotary potentiometer. This is shown in the

corresponding figure.

Potentiometer

shaft

6 teeth

30 teeth

1.21.

Empty

Full

Half

Float

The rotary potentiometer is linear with a resistance, R=100kn, distributed over a

330° strip (i.e. the potentiometer can rotate 330°). The float is connected to the

shaft of a gear with 30 teeth and that in turn rotates the potentiometer through a

gear with 6 teeth. The mechanical linkage is set so that when the tank is full, the

potentiometer resistance is zero. The float is shown in three positions to show

how the resistance changes (increases from zero at full tank).

1. Estimate the cost of a linear rotary potentiometer for this application?

Potentiometers come in A, B, and C types. Which one is linear? Is the

assumption that it can rotate 330 degrees acceptable? Find a datasheet of a

linear potentiometer that would work for this project.

i. Answer here