Master intake gauge may also be referred as compound or _______?

Master intake gauge may also be referred as compound or _______?

• A. Vacuum gauge
• B. Pressure gauge
• C. Differential gauge
• D. Pitot tube

Answer: (A)

Measuring intake pressure centers on the suction created inside the intake manifold, which is a negative pressure relative to the atmosphere. A master intake gauge is used to display that suction. When described as compound, it means the instrument can show both negative (vacuum) and positive pressures on the same device, but the aspect you’re focusing on for intake is the negative side. That’s why it’s called a vacuum gauge—the readings of interest are the negative pressures inside the intake rather than positive pressures. A differential gauge would only show the difference between two pressures, a Pitot tube measures dynamic/ stagnation pressure in a flow, and a plain pressure gauge would typically read positive pressure only.

Measuring intake pressure centers on the suction created inside the intake manifold, which is a negative pressure relative to the atmosphere. A master intake gauge is used to display that suction. When described as compound, it means the instrument can show both negative (vacuum) and positive pressures on the same device, but the aspect you’re focusing on for intake is the negative side. That’s why it’s called a vacuum gauge—the readings of interest are the negative pressures inside the intake rather than positive pressures. A differential gauge would only show the difference between two pressures, a Pitot tube measures dynamic/ stagnation pressure in a flow, and a plain pressure gauge would typically read positive pressure only.