If the reading on the remote pressure gauge does not match the reading on the regulator gauge while wearing SCBA, what should you assume?

When using a Self-Contained Breathing Apparatus (SCBA), it is important to understand the relationship between the remote pressure gauge and the regulator gauge. If there is a discrepancy between the two readings, the lower of the two readings is typically the more accurate indicator of the available air supply.

This is due to the fact that the regulator gauge measures the pressure of air immediately at the regulator, which can be affected by various factors such as the demand or flow of air the wearer is using. On the other hand, the remote pressure gauge indicates the overall pressure in the cylinder. If the regulator gauge shows a lower pressure, it often means that there has been significant use of air and that the cylinder is depleting, reflecting a more reliable current state of the air supply available to the user.

Thus, assuming that the lower reading is correct allows the SCBA user to take appropriate actions, such as conserving air or exiting the hazardous environment before the air supply becomes critically low. It emphasizes the importance of monitoring air supply accurately to ensure the safety of the user.