L1-01E.14 – Outdated Sensors Passive Ultrasonic or Infrasonic A motion detection device that “listens” for ultrasonic sound energy in an area, and reacts to high frequencies associated with intrusion attempts The sensor “listens” for...
L1-01E.13 – Outdated Sensors Microwave Sensors Motion detection devices that flood a designated exterior or interior area with an electronic field A movement in the area disturbs the field and sets off an alarm Signals generated are within pre-set limits that do not...
L1-01E.12 – Outdated Sensors Active Ultrasonic A motion detecting device that emits ultrasonic sound energy into a monitored area and reacts to a change in the reflected energy pattern Ultrasonic sound is transmitted from the device in the form of energy The sound...
L1-01E.11 – Outdated Sensors Cord Trap An outdated means of detection consisting of a cord or wire stretched across a doorway and connected to the protective circuit Breaking or pulling the cord loose breaks the circuit and trips the alarm Space-protection devices and...
L1-01E.10 – Outdated Sensors Lacing Fine wire stretched back and forth across skylights, ducts, or other openings An intruder breaking a wire will trip the alarm Most modem alarm systems use motion detectors instead of...
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