What activates when the low cylinder transfer valve and secondary reducer open?

When the low cylinder transfer valve and secondary reducer open, it activates the Vibralert system. The Vibralert is an integral safety feature designed to alert the user of a low air supply condition. Once the pressure in the primary cylinder drops to a certain threshold and the valve opens, the Vibralert utilizes vibration to signal that the air supply is running low, prompting the user to take immediate action to conserve air or exit the hazardous environment.

This alert mechanism is crucial for ensuring the safety of personnel using the SCBA, as it helps maintain awareness of air supply status under potentially stressful conditions where visual or auditory signals might be missed. In the context of firefighting and emergency response, timely awareness of air supply is essential for maintaining the safety and operational effectiveness of the responders. Other options may provide different types of feedback or information but do not specifically activate based on the opening of these valves.