Which type of smoke detector is preferred for door releasing service?

For door releasing service, ionization smoke detectors are preferred due to their sensitivity to fast-growing fires that produce small combustion particles. This characteristic allows them to detect smoke more quickly in certain scenarios, particularly those that may involve the rapid accumulation of smoke in enclosed spaces, such as near doors or entrance ways.

Ionization detectors operate based on the ionization of air within a sensing chamber. When smoke particles enter the chamber, they disrupt the flow of ions, which leads to a change in current that triggers the alarm. This makes them particularly effective for detecting flaming fires where smoke particles are minimal and rapid detection is vital.

While other types of detectors, such as photoelectric detectors, can also be effective in specific applications, they are generally more suited for smoldering fires that produce larger smoke particles. Heat detectors are focused on changes in temperature rather than the presence of smoke, making them less appropriate for door releasing applications where smoke presence is a key concern. Therefore, ionization smoke detectors are an optimal choice for such situations, providing timely alerts that can facilitate the safe and swift release of doors in response to smoke or fire conditions.