Describe the different types of fire alarm initiating devices, including their operating principles and applications.

Fire alarm initiating devices are components of a fire alarm system that detect the presence of a fire and initiate an alarm signal. There are several types of initiating devices, each with its own operating principle and application. Smoke detectors detect the presence of smoke, which is an early indicator of fire. There are two main types of smoke detectors: ionization smoke detectors and photoelectric smoke detectors. Ionization smoke detectors use a small amount of radioactive material to ionize the air in a sensing chamber. Smoke particles entering the chamber disrupt the ioniza....