In which condition would the Transmitted beam Photo Detector show an OFF output state?

The Transmitted beam Photo Detector is designed to detect the presence or absence of a target based on the light beam it transmits. When the target is present, the light beam is interrupted, and the photo detector typically registers an ON output state to indicate detection.

Conversely, the OFF output state is indicative of a complete lack of detection or signal. This can occur in scenarios where there is no target interrupting the light beam, thereby allowing the beam to remain uninterrupted. The OFF state suggests that the detector is not receiving the expected signal, confirming that no target is present.

The notion of the target being absent aligns perfectly with the detector's functionality. It signifies that the light path remains unobstructed, resulting in no activation of the sensor's output. Understanding the operational mechanism of the Transmitted beam Photo Detector reveals that the OFF state directly relates to the absence of the target in its detection zone.