Automation System
Standard computer control products:

All of these
do not exist yet
are available off the shelf
are very expensive and not cost effective
None of these

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Automation System
Time proportioning control:

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

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Automation System
Pressure sensors:

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

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