What is the purpose of a pressure gauge in a refrigeration system?

The purpose of a pressure gauge in a refrigeration system is to determine the pressure levels in the system. Pressure gauges are critical components that provide operators with information about the pressure in various parts of the refrigeration cycle, such as the compressor, evaporator, and condenser. By monitoring these pressure levels, operators can assess the system's performance and diagnose any potential issues, including refrigerant leaks, blockages, or inefficiencies. Understanding the pressure allows for better management of the refrigeration cycle, ensuring efficient operation and preventing damage to the system.

The other choices focus on functions that are not related to pressure measurement in refrigeration. For example, measuring humidity is unrelated to pressure and typically involves different instruments, while indicating refrigerant flow requires flow meters. Likewise, temperature measurement relies on thermometers or thermocouples rather than pressure gauges. Thus, the role of a pressure gauge is specifically tied to monitoring pressure levels within the refrigeration system.