Float Systems Measurement
Using float systems for level measurement
Measuring the position of a float on the
surface of a liquid by means of a suitable transducer is another fairly
simple and cheap method of liquid level measurement. The system using a
potentiometer is very common, and is well known for its application to
monitoring the level in motor vehicle fuel tanks.
An alternative system, which is used in
greater numbers, is called the float and tape gauge (or tank gauge).
This has a tape attached to the float which passes round a pulley
situated vertically above the float. The other end of the tape is
attached to either a counterweight or a negative-rate counterspring. The
amount of rotation of the pulley, measured by either a synchro or a
potentiometer, is then proportional to the liquid level.
These two essentially mechanical systems
of measurement can achieve quite high levels of accuracy, but their
maintenance requirements are always high.

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