When does the master alarm system activate in a medical gas system supplied by a bulk system?

The master alarm system in a medical gas system supplied by a bulk system is designed to activate during critical events that require immediate attention. Specifically, it activates when a changeover occurs from one gas supply source to another. This is essential in maintaining continuous medical gas availability, as changeover typically indicates that one supply is depleting or has depleted, and the system needs to switch to an alternate source to prevent interruptions in gas delivery to patients.

Activating the master alarm during a changeover serves as an important alert for the medical staff, ensuring they are aware of the transition and can monitor the system to ensure that gas flow remains uninterrupted. This is a crucial safety feature, as it helps maintain the reliability of medical gas systems in clinical environments where continuous gas supply is vital for patient care.

In contrast, the other situations mentioned, such as exceeding pressure limits or low supply levels, while important, do not necessarily trigger the master alarm in the same way a changeover does. An alarm for those situations might be more localized, focusing on specific supply zones or systems rather than activating a broad master alarm response.