<Li> Manually actuated devices; also known as fire alarm boxes, manual pull stations, or simply pull stations, break glass stations, and (in Europe) call points . Devices for manual fire alarm activation are installed to be readily located (near the exits), identified, and operated . They are usually actuated by means of physical interaction, such as pulling a lever or breaking glass . </Li> <Li> Automatically actuated devices can take many forms intended to respond to any number of detectable physical changes associated with fire: convected thermal energy; heat detector, products of combustion; smoke detector, radiant energy; flame detector, combustion gasses; fire gas detector, and release of extinguishing agents; water - flow detector . The newest innovations can use cameras and computer algorithms to analyze the visible effects of fire and movement in applications inappropriate for or hostile to other detection methods, such as the Fike Corporation's Signifire system . </Li> <Ul> <Li> Notification Appliances utilize audible, visible, tactile, textual or even olfactory stimuli (odorizer) to alert the occupants of the need to evacuate or take action in the event of a fire or other emergency . Evacuation signals may consist of simple appliances that transmit uncoded information, coded appliances that transmit a predetermined pattern, and or appliances that transmit audible and visible textual information such as live or pre-recorded instructions, and illuminated message displays . </Li> <Li> In the United States, fire alarm evacuation signals generally consist of a standardized audible tone, with visual notification in all public and common use areas . Emergency signals are intended to be distinct and understandable to avoid confusion with other signals . </Li> </Ul> <Li> Notification Appliances utilize audible, visible, tactile, textual or even olfactory stimuli (odorizer) to alert the occupants of the need to evacuate or take action in the event of a fire or other emergency . Evacuation signals may consist of simple appliances that transmit uncoded information, coded appliances that transmit a predetermined pattern, and or appliances that transmit audible and visible textual information such as live or pre-recorded instructions, and illuminated message displays . </Li>

Use of response indicator in fire alarm system