🔍 Key Concepts

• Distinguish between pressure-sensing devices and temperature-sensing devices in gas turbine instrumentation. • Understand what a transducer does in a control/monitoring system versus a simple mechanical indicator like a manometer. • Use the GT-0017 illustration annotations to see how the lube oil scavenge system connects to the engine’s electronic/monitoring system.

💭 Think About

• Which of the four choices is normally used to convert a physical pressure in a line into an electrical signal that can be sent to a gauge, alarm, or control system? • Which device in the list is normally associated with temperature measurement rather than pressure, and which is typically a simple U‑tube or column type indicator? • Looking at GT‑0017, would lube oil scavenge pressure need to be fed into an automatic monitoring/control system, or just read locally at the machinery? How does that influence the device used?

✅ Before You Answer

• Eliminate the option that is clearly a temperature-only sensor. • Eliminate the option that is primarily a visual/mechanical pressure indicator, not an electronic signal device. • Focus on the device whose main job is to convert pressure into a proportional electrical signal for the turbine’s monitoring system.