Which component activates the vibralert upon a change in pressure?

The component that activates the vibralert upon a change in pressure is the emergency pressure side. The vibralert system is designed to provide a tactile alert to the firefighter when the air pressure in the cylinder falls below a certain threshold, indicating that it is time to exit the hazardous environment. This system is especially critical during high-stress situations where visual cues may not be sufficient.

When the pressure decreases, the emergency pressure side senses this change and triggers the vibralert mechanism. This ensures that firefighters receive immediate feedback about their air supply status, which is crucial for their safety. It serves as an important fail-safe to help prevent situations where a firefighter may become incapacitated due to lack of air.

In contrast, the pressure reducer regulates the high-pressure air from the cylinder to a usable pressure but does not provide direct alerts based on pressure changes. The cylinder valve is primarily responsible for opening and closing the airflow to the breathing apparatus, while the cylinder gauge displays the current air pressure without actively signaling changes. Therefore, the emergency pressure side is the component specifically designed to activate the vibralert in response to changes in pressure.