In an industrial fan maintenance context, which physical change might a sensor detect, measure, and transmit?

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In this context, sensors are used to monitor physical quantities and send that data to a control system. Wind direction is a change in the external environment that a sensor can readily detect with a wind vane or directional sensor, measure, and transmit. This environmental parameter can vary and impact how the fan operates—spreading, intake conditions, or safety considerations—so capturing and sharing it helps maintain and optimize performance. The other options describe measurements of the machine’s own state or electrical properties (vibration, blade speed, power), which are important too but are not environmental changes surrounding the equipment. Wind direction best illustrates a sensor detecting a physical change and transmitting it for monitoring.