What is the function of a Normally Open proximity sensor?

• A. To remain active when not triggered
• B. To remain inactive when not triggered
• C. To detect pressure changes
• D. To measure temperature variations

Answer: (B)

A Normally Open proximity sensor is designed to remain inactive when it is not triggered. This means that under normal, untriggered conditions, the sensor does not conduct electricity and does not transmit a signal. When an object comes within the sensor's detection range, the sensor "closes" and becomes active, allowing current to flow and enabling an output signal to be sent.

This functionality makes Normally Open sensors particularly useful in applications where an action should only occur in response to detecting the presence of an object or a change in condition. The sensor effectively acts as a switch that closes only when the specified condition is met.