What types of detectors are commonly used for door closer operation?

The choice of photoelectric, ionization, or other listed types of detectors for door closer operation is correct due to their functionality and reliability in detecting the presence of smoke or fire in proximity to doors. Photoelectric detectors work by using light to detect smoke particles, making them highly sensitive to slow, smoldering fires, which can help in early detection. Ionization detectors are effective at sensing fast-flaming fires, as they can detect specific changes in ion charges caused by smoke. Both types are listed in safety standards due to their proven effectiveness and are compatible with mechanisms that require prompt alerts to facilitate door operations in emergencies.

In contrast, other detector types mentioned in the incorrect choices are either not suitable for fire detection or do not directly integrate with door closer operations. For instance, thermal detectors respond to changes in temperature, magnetic types might not provide adequate fire detection capabilities, and sound or vibration detectors are not typically utilized for smoke or fire detection. Therefore, the use of photoelectric and ionization detectors is preferred for ensuring safety in door operation systems during fire incidents.