What is the primary function of a manometer in refrigeration systems?

The primary function of a manometer in refrigeration systems is to measure the pressure of vapors and gases. This instrument provides critical information about the pressure levels within the system, which is essential for ensuring the refrigeration system operates efficiently and safely. Maintaining the correct pressure is crucial for optimal performance and can help diagnose issues within the system. If the pressure is too high or too low, it can lead to inefficient operation or potential failures.

The other options focus on different functionalities that do not align with the primary purpose of a manometer. For instance, regulating flow pertains more to control devices like valves or flow meters. Assessing temperature differences is the domain of thermometers or temperature sensors, and determining humidity levels falls under the capabilities of hygrometers or humidity sensors. Thus, the specificity of the manometer to pressure measurement underscores why this choice is the correct one.