Automation System
An aneroid barometer

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
None of these

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Automation System
Pressure sensors:

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

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