Automation System
Computer-based controllers:

None of these
(a) and (c) above
are very difficult to change
should be built in a modular fashion wherever possible
are very flexible

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Automation System
Sensors:

are easily developed
None of these
are not important in automation
will be much smarter and more sophisticated in the future
probably will not improve over the next decade

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Automation System
An aneroid barometer

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

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