Personal alert safety system (PASS) alarms are designed to activate when:

Personal alert safety systems (PASS) alarms are crucial safety devices used in firefighting. They are specifically designed to enhance the safety of firefighters by monitoring their movement. When a firefighter becomes motionless for an extended period, typically around 30 seconds, the PASS device activates an audible alarm. This feature is critical because it alerts other firefighters to the possibility that a colleague may be in trouble, potentially incapacitated, or unable to alert their team due to dangerous conditions.

The design of PASS alarms emphasizes the need for awareness and encourages rapid response in emergency situations. The system provides an added layer of security, ensuring that help can be summoned quickly in case a firefighter is in distress.

While there are other scenarios that may be critical in firefighting, such as a fall or low air supply, the primary function of the PASS alarm specifically relates to a lack of movement. This distinction is vital for understanding their operational purpose in emergency situations.