Automation System
An aneroid barometer

can be used to measure gas or liquid flow rates
can measure only atmospheric pressure
is very unreliable
None of these
measures pressure by sensing deflection of an evacuated chambers.

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Automation System
Digital signals:

can have three possible levels
have a frequency measured in units of hertz
have a sinusoidal shape.
None of these
are assigned values of 1 or 0 depending on the voltage level

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