Automation System
An aneroid barometer

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

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Automation System
Pressure sensors:

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

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