In which situation must the PASS device go into full alarm mode?

The correct situation for the PASS device to go into full alarm mode is when the user becomes motionless for 30 seconds. This feature serves as a vital safety mechanism for users of the Self-Contained Breathing Apparatus (SCBA), particularly in hazardous environments where movement may be restricted or the user may be incapacitated.

By activating the alarm after 30 seconds of inactivity, it alerts nearby personnel to the potential danger the user may be in, enabling a quicker response to assist or rescue them if needed. The purpose of this function is to ensure that if a firefighter or first responder is in trouble, help can be summoned without delay, potentially saving lives.

In situations involving low air pressure or when the SCBA is turned off, the device would not necessarily trigger the full alarm mode; rather, those scenarios might indicate more of an operational status concern. External emergencies do not directly affect the motion sensor feature of the PASS device, which specifically targets user movement as a trigger for activation.