ABAT ABAT Sensors, Detectors & Detection Devices 2

Question 1

Active infrared beam detectors generate an alarm when the invisible beam between the transmitter and receiver is interrupted. What is one major limitation of this detector type?

Accepted Answer

They require a direct line of sight and can be defeated by slow low-crawl intrusion

Answer

Active IR beam detectors require unobstructed line of sight and can potentially be defeated by an intruder moving slowly below the beam height, which is why they are often stacked in multiple beams or combined with other sensor types.

Question 2

What does 'pet immunity' in a PIR motion detector typically mean?

Accepted Answer

The detector ignores all motion below a programmable weight threshold, typically up to 40–80 lbs

Answer

Pet-immune PIR detectors use downward-angled lens patterns and sensitivity adjustments to ignore heat signatures below a certain mass/height threshold (commonly up to 40–80 lbs), allowing animals to move freely without triggering alarms.

Question 3

A seismic or vibration sensor is best suited for protecting which type of asset?

Accepted Answer

Vaults, safes, and ATMs against physical attack

Answer

Seismic detectors sense the low-frequency vibrations produced by drilling, cutting, or impact attacks on hard surfaces, making them ideal for protecting vaults, safes, and ATMs from physical attacks.

Question 4

What type of sensor is best used to detect intruders crossing an outdoor perimeter such as a fence line?

Accepted Answer

Microwave fence disturbance sensor or electrostatic sensor

Answer

Microwave fence disturbance sensors or electrostatic field sensors are specifically designed to detect climbing, cutting, or lifting of fence panels along an outdoor perimeter.

Question 5

What causes 'range creep' in microwave motion detectors?

Accepted Answer

Microwave energy passing through walls and detecting motion in adjacent rooms or outside the building

Answer

Microwave signals penetrate non-metallic walls and materials, so a microwave detector can detect motion in unintended areas like adjacent rooms, stairwells, or even outside the building.

ABAT - Advanced Burglar Alarm Technician Certified Practice Test

ABAT - Advanced Burglar Alarm Technician Certified Practice Test

ABAT ABAT Sensors, Detectors & Detection Devices 2