Pneumatic pressure type detectors are composed of which system?

• A. Merrill system
• B. Lindberg system
• C. Harris system
• D. Newton system

Answer: (B)

Pneumatic pressure type detectors rely on a sealed air-pressure sensing circuit to detect heat. They are configured as part of the Lindberg system, which uses a common pressure source and detector units routed through the protected areas. When a detector is heated, the trapped air expands, increasing pressure in the line and actuating a diaphragm or switch that sends a signal to the warning/control panel. This arrangement is characteristic of the Lindberg system, which is why it’s the correct choice. The other names refer to different brands or detection approaches and aren’t the system associated with pneumatic pressure type detectors.