Definition
A sensor that measures the difference between two pressures and converts that difference into an electrical signal the aircraft's instruments or computers can read. In a turbine engine, one is used to compare exhaust pressure to inlet pressure to produce the Engine Pressure Ratio (EPR) shown to the pilot.
Plain English
A device that takes two pressure readings, calculates the difference between them, and turns that difference into an electrical signal a gauge or computer can display.
Context Anchor
Seen in turbine-engine instrument systems, especially when studying how engine pressure ratio is measured and displayed.
Derivation
Differential means "showing a difference." Transducer comes from the Latin transducere, meaning "to lead across" -- a device that leads one form of energy across into another. Here, pressure is converted into an electrical signal.
Why Pilots Care
It supplies the accurate pressure difference data needed for EPR indication, allowing pilots to monitor engine thrust output and performance.
Intuition Check
Differential does not mean a special type of pressure. It means the device is comparing two pressures and using the difference between them.
Example Sentence 1
The EPR gauge gets its reading from a differential pressure transducer that compares engine exhaust pressure to engine inlet pressure.
Example Sentence 2
Maintenance checked the differential pressure transducer after an EPR discrepancy appeared on the engine instruments.