ABAT Sensors, Detectors & Detection Devices Flashcards
6 cards from real ABAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 ABAT Sensors, Detectors & Detection Devices flashcards as text
What is the function of an end-of-line (EOL) resistor in a detection zone?
Answer: Allows the panel to supervise the zone wiring for opens and shorts independently
An EOL resistor placed at the far end of the zone loop allows the alarm panel to distinguish between three states: normal (supervised resistance), alarm (open circuit), and tamper/cut wire (short circuit).
A passive infrared detector is mounted in a corner of a 20×20 ft room. Which lens type provides the best 360-degree coverage from that mounting position?
Answer: Wide-angle or corner lens (up to 180°)
A wide-angle or corner-mount lens pattern (up to 180°) is designed specifically for corner installations, providing maximum room coverage with a single detector from that vantage point.
What is a 'volumetric' detection pattern in the context of motion sensors?
Answer: A three-dimensional detection coverage area that fills a volume of space
Volumetric detection covers a three-dimensional area (width, height, and depth) rather than a flat plane, providing comprehensive coverage against intruders at any height within the protected space.
When selecting a glass break detector for a room, what is the maximum typical rated detection radius for most commercial acoustic glass break detectors?
Answer: 25 feet (7.6 m)
Most commercial acoustic glass break detectors are rated for a detection radius of approximately 25 feet (7.6 m), though obstructions like furniture and heavy drapes can reduce effective range.
What is the primary purpose of a 'tamper switch' or 'tamper circuit' built into an alarm sensor or device?
Answer: To detect and report unauthorized removal or opening of the device enclosure
A tamper circuit triggers an alarm or trouble condition if the sensor housing is opened or removed from its mounting surface, alerting the monitoring center to possible tampering or sabotage.
Which installation location is generally recommended to avoid for a PIR motion detector due to high false alarm risk?
Answer: Aimed directly at a heating vent, radiator, or air conditioning return
Mounting a PIR detector where it can directly receive airflow from HVAC vents or detect the radiant heat from a heating unit creates a high risk of thermal false alarms.