What does a compound pressure gauge measure?

A compound pressure gauge measures both pressure and vacuum, which makes it an essential tool for HVAC systems and various applications where both conditions need to be monitored. These gauges typically have a dial that indicates pressure above atmospheric levels on one side and vacuum (or pressure below atmospheric levels) on the other side.

This dual capability allows technicians to easily assess the operational status of systems that may experience both positive and negative pressures, providing valuable information about system performance and efficiency. For example, in refrigeration systems, measuring the vacuum can help determine if there is an adequate pressure level for the refrigerant flow and whether the system is properly evacuated before charging.

In contrast, other options are limited in what they measure: some focus solely on gauge pressure, while others may measure only absolute pressure or include temperature, making them less versatile in applications where understanding both pressures and vacuums is crucial.