What function does a pressure gauge serve in a boiler system?

A pressure gauge in a boiler system plays a critical role by measuring the operational pressure within the boiler. This measurement is vital for several reasons. First, it allows operators to monitor whether the boiler is functioning within its safe and efficient pressure range, which is essential for preventing unsafe conditions that could lead to equipment failure or hazards such as explosions. Accurate pressure readings ensure that the boiler operates effectively and enables timely interventions if pressure readings deviate from the norm.

In a boiler, maintaining the correct pressure is critical for efficient operation, affecting the boiling point of the water and thus the overall performance of the heating system. Operators use these readings to make informed decisions about the operation of the boiler, including adjustments needed to ensure safety and efficiency.

The other options do not accurately describe the primary function of a pressure gauge. For instance, measuring temperature or water level does not reflect the function of a pressure gauge. Nor does regulating the fuel supply; while these tasks are essential for boiler operation, they are managed by different components and systems within the boiler framework. Hence, the focus remains on the pressure gauge's importance in maintaining safe and efficient boiler operation.