Automation System
Light sensors:

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

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Automation System
A continuous process is:

used only with analog controllers.
self-contained in that raw materials enter the process and an identifiable products exits the process.
None of these
used only for simple tasks
one that never shuts down

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