Question

question 14 of 20
how do presence-sensing devices work?

• ai is used to identify employee faces inside machine guards
• if an employees presence is not sensed, the machine wont start
• a guard is stationed to watch the machine and hit a button when employees are present
• if a presence-sensing barrier is tripped by an employee potentially contacting hazardous areas, the machine stops

Explanation:

Analyze presence-sensing device mechanism

Presence-sensing devices (such as light curtains, photo-electric sensors, or radiofrequency barriers) detect when a person or object enters a hazardous area and automatically stop or prevent the machine cycle to protect the operator.

Evaluate the options

• Option 1: AI facial recognition is not a standard industrial safeguarding mechanism for presence-sensing devices.
• Option 2: This describes an enabling device or interlock logic rather than the active safety function of a presence-sensing barrier.
• Option 3: Human guards watching machines is not an automated presence-sensing device.
• Option 4: This correctly describes how a presence-sensing barrier functions by stopping the machine when tripped by an employee entering a hazardous zone.

Answer:

• AI is used to identify employee faces inside machine guards
• If an employee's presence is not sensed, the machine won't start
• A guard is stationed to watch the machine and hit a button when employees are present
• If a presence-sensing barrier is tripped by an employee potentially contacting hazardous areas, the machine stops (Correct answer)