Automation System
An aneroid barometer

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

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Automation System
Pressure sensors:

use capacitive variations to sense pressure
use the piezoresistive effect in strain gauge sensors
use an aneroid chamber with a variable resistance output
All of these
None of these

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