Automation System
An aneroid barometer

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

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Automation System
Light sensors:

cannot be used a s limit switches.
None of these
come in a wide variety of mounting styles
work in direct sunlight
never use infrared light as light source

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Automation System
Trend analysis:

can improve control system response
is a brand new concept
None of these
is used only in financial planning
requires a very expensive system to implement

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