When should the master alarm activate due to supply line pressure changes?

The activation of the master alarm in response to supply line pressure changes is typically set at an increase or decrease of 20%. This threshold is designed to ensure patient safety and system reliability by providing an early warning of significant pressure fluctuations that may compromise the efficacy of medical gas delivery systems. A 20% variation is a critical level, as it indicates potential issues with the gas supply that could affect patient care or equipment functioning.

This standard allows for a balance between operational parameters and the need to minimize false alarms that could cause unnecessary responses or alarm fatigue among healthcare personnel. Maintaining pressures within specified limits is crucial for the performance of medical devices that rely on these gases. Establishing a clear and defined threshold helps ensure that appropriate actions can be taken before a situation becomes critical.