Which system activates when air is coming from the secondary transfer valve?

The Vibralert system is designed to activate when air is coming from the secondary transfer valve on the Scott Air-Pak X3 breathing apparatus. This feature is crucial as it provides a clear alert to the user that the primary air supply is running low or has been depleted, prompting the transition to the secondary air source. The Vibralert serves as a vital safety mechanism, ensuring that personnel are aware of their air supply status and can take appropriate actions before their air supply is exhausted.

In contrast, other systems mentioned, like the Vigilant, Ventilation Alert, and Emergency Breather, serve different functions and are not specifically tied to the activation from the secondary transfer valve in this context. For instance, the Vigilant system may deal with communication warnings, while the Emergency Breather functions as a backup in critical situations rather than as an alert during normal operation. The Ventilation Alert is typically associated with air quality monitoring rather than the air supply switch-over process. Thus, understanding the specific roles of these systems is essential for safe operational practices with the SCBA.