When does the first low pressure alarm trigger in a BG4?

The first low-pressure alarm in a BG4 breathing apparatus is designed to trigger at 55 bar. This point indicates that the pressure of the air supply is getting low enough to warrant attention from the user. The alert allows the wearer to be cognizant of the diminishing air supply and take appropriate actions, such as planning to exit the hazardous environment or switch to another air supply if needed.

Setting the alarm at 55 bar ensures that miners have sufficient time to respond before the air supply becomes critically low, enhancing safety during rescue or emergency operations. Monitoring pressure levels closely is crucial in mine rescue situations where every moment counts and air availability is vital for the safety of individuals involved.

Different values like 50, 60, or 65 bar are not the correct thresholds for the first low-pressure alarm, indicating they do not provide the same urgency or effectiveness as the 55 bar setting.