What does the compound gauge of a gauge manifold set measure?

• A. High pressure
• B. Low pressure
• C. Temperature
• D. Vacuum

Answer: (B)

The compound gauge of a gauge manifold set is designed to measure both low pressure and vacuum. This dual function is essential in refrigeration and air conditioning systems, where understanding the pressure conditions is critical for proper system diagnostics and maintenance.

When the gauge reads pressure below atmospheric pressure, it shows this as a vacuum, which is an important aspect to monitor when working with refrigerant systems during evacuation processes or refrigerant charging. The capability to assess low pressures enables technicians to evaluate the system's operational status effectively. Recognizing whether the pressure is below atmospheric levels assists in determining if there are leaks or if the system is performing optimally.

Understanding gauge measurements is crucial, especially in troubleshooting refrigerant systems, where both low pressures during operation and vacuums during service procedures must be analyzed to ensure the system's efficiency and integrity.