Automation System
Today, programmable controllers:

can be cost effective even when replacing just a few relays
All of these
are relatively low cost compared with the original digital equipment available for industrial control
None of these
are more powerful then the first controllers on the market

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Automation System
An aneroid barometer

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

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