🔍 Key Concepts

• Duplex pressure gage measures two related pressures at the same time • Differential pressure is often used to check for clogging or restriction in a system • Fuel oil system components: pump discharge, strainer, heater, and flow meter all have different monitoring needs

💭 Think About

• Ask yourself: In which component is it most important to know the pressure drop across it to see if it is getting dirty or blocked? • Which location would need two pressures compared (inlet and outlet) rather than just a single line pressure? • Which of the listed components is specifically monitored for increasing resistance to flow over time?

✅ Before You Answer

• Identify which item would normally have an inlet and outlet pressure that you want to compare continuously • Consider where a clog or fouling would be most common and critical to detect early • Eliminate options where a single pressure reading is usually sufficient, not two