Automation System
Light sensors:

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

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Automation System
What is offset error?

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

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