Certified Data Centre Professional (CDCP) 2025 – 400 Free Practice Questions to Pass the Exam

Ionization detectors are the fastest at detecting smoke primarily because they rely on a radioactive material to ionize the air within the sensing chamber. When smoke enters this chamber, it disrupts the ion flow, triggering the alarm almost immediately. This rapid response makes ionization detectors particularly effective at identifying fast-flaming fires, which produce little visible smoke.

In contrast, photodielectric detectors, while effective in smoke detection, depend on the scattering of light caused by larger particles found in smoke. They require a greater amount of smoke to obscure the light before an alarm is activated, making them slower than ionization detectors in detecting fires that produce little smoke initially.

FM200 is not a smoke detection sensor but rather a fire suppression agent used in data centers. It functions to extinguish fires once they are detected, but it does not actively sense smoke.

Sprinkler valve or fuse links are components of a fire suppression system designed to activate water flow when a certain temperature is reached, but they are not smoke detection devices. They respond based on heat rather than smoke detection.

Therefore, the speed and method of detection make ionization detectors the fastest option for identifying smoke in a fire scenario.