____ use multiple infrared beams that are aimed across a doorway and positioned so that as a person walks through the doorway some beams are activated.
A) Lockout sensors
B) Engineering sensors
C) Tailgate sensors
D) Proximity sensors

Question

Quizplus · Accepted Answer

Tailgate sensors use multiple infrared beams to detect when someone is attempting to follow closely behind another person through a doorway or access point. As a person walks through the doorway, some of the beams are activated and the system can determine if there is more than one person, therefore preventing unauthorized entry. Lockout sensors are typically used in industrial machinery, while engineering sensors are used to monitor equipment performance. Proximity sensors are used to detect nearby objects but cannot distinguish between individuals.

____ Use Multiple Infrared Beams That Are Aimed Across a Doorway