What is the main function of a pressure gauge in hydraulic systems?

In hydraulic systems, the primary role of a pressure gauge is to measure fluid pressure. This measurement is crucial as it allows operators and engineers to monitor the system's performance and ensure that it operates within safe and efficient pressure levels. Monitoring fluid pressure helps identify potential issues such as leaks, blockages, or equipment malfunction. Proper pressure readings are essential for the safe operation of hydraulic equipment, as excessive pressure can lead to system failures, while inadequate pressure may hinder performance.

The other options relate to different functions that are not typically performed by a pressure gauge. Some are vital aspects of hydraulic systems, such as flow control and filtration, but those purposes are achieved through separate components and mechanisms rather than a pressure gauge. Understanding this distinction highlights the specific importance of pressure gauges in maintaining hydraulic system efficiency and safety.