Automation System
An aneroid barometer

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

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Automation System
Time proportioning control:

cannot use a TM990 micro¬computer
a and b above.
None of these
is less efficient than normal PID control
can be used on a PM550 programmable process controller

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