Automation System
Light sensors:

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

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Automation System
Semiconductor devices:

All of these
are less reliable than electro¬mechanical components
have a very short infant mortality period
usually have a very short MTBF (mean time between failure)
None of these

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