What does a pressure gauge help monitor in pneumatic systems?

A pressure gauge in pneumatic systems is vital for monitoring the pressure of air within the system. This is crucial because pneumatic systems rely on compressed air to perform their functions. Maintaining the correct air pressure ensures the system operates efficiently and safely. If the pressure is too low, it may result in insufficient force for actuators and tools, leading to poor performance or failure to operate altogether. Conversely, if the pressure is too high, it could cause damage to the components, leading to potential safety hazards and costly repairs.

The other options focus on aspects not directly related to the function of a pressure gauge in pneumatic systems. For example, while energy consumption and lubrication levels are important in overall system maintenance, they are not monitored by a pressure gauge. Similarly, the amount of fluid in a tank is relevant to hydraulic systems, not pneumatic systems, where air rather than liquid is the working fluid. Thus, the pressure gauge specifically serves the function of ensuring proper air pressure, which is fundamental for the efficient operation of pneumatic systems.