Automation System
Light sensors:

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

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Automation System
What is offset error?

the difference between the sensor input and the absolute sensed parameter.
All of these
the difference between the controller output and the setting of the manipulated variable.
None of these
the difference between the control setpoint value and the actual value.

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