Automation System
An aneroid barometer

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

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Automation System
Pressure sensors:

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

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