Automation System
Time proportioning control:

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

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Automation System
Pressure sensors:

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

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Automation System
Light sensors:

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

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