Automation System
An aneroid barometer

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

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Automation System
Pressure sensors:

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

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