What does a reading of 0 psi on the pressure gauge suggest about the system's state?

A reading of 0 psi on the pressure gauge indicates that the system has no pressure. This scenario typically suggests that the pneumatic system is either not filled with compressed air or that there has been a significant failure, such as a complete loss of pressure due to a leak or other mechanical failure.

In a properly functioning pneumatic system, a pressure gauge should display some level of psi, confirming that compressed air is maintained within the system for operation. A reading of zero means that the air supply has been depleted, which may prevent the system from performing any intended functions.

In this context, while a leak could cause a system to lose pressure, a standard leak would usually lead to a low psi reading rather than a complete absence of pressure. Furthermore, while the need to replace a filter could impact system pressure, it would not result in a reading of zero psi unless it obstructed airflow severely over time which leads to other pressure issues. Thus, the most direct interpretation of a 0 psi reading is that the system has no pressure at all.