🔍 Key Concepts

• Trace the oil outlet line in the illustration and find where pressure switch PS2 is connected. • Think about how flow rate (throughput) and oil temperature/viscosity affect the pressure in that outlet line. • Consider what happens to the measured pressure if the small sensing line going to a pressure switch becomes blocked.

💭 Think About

• If the actual outlet pressure drops, which of the listed conditions would physically cause that drop in pressure in the line shown? • If the sensing line to PS2 is obstructed, does the switch still see the real outlet pressure, or is it isolated with whatever pressure is trapped in the line? • Would a higher separating temperature tend to make the oil easier or harder to pump, and how would that influence pressure at a constant pump setting?

✅ Before You Answer

• Verify on the diagram exactly where PS2 taps into the oil outlet line and how the signal reaches the alarm unit. • Decide for each option whether it would lower the real outlet pressure or prevent PS2 from detecting it correctly. • Make sure the condition you choose would actually result in the alarm seeing low pressure, not just a change somewhere else in the system.