Why are RTD sensors often placed in critical locations within propulsion plants?

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In propulsion plants, accurate and stable temperature readings at critical points are essential for safe operation and proper control. RTD sensors use a platinum element whose resistance changes in a highly predictable way with temperature, giving high accuracy and excellent repeatability. This means the readings stay reliable over long periods, even in harsh conditions with vibration, EMI, or moisture. That reliability is why these sensors are placed where precise temperature monitoring is crucial: the control decisions depend on trustworthy data, not on readings that drift over time. RTDs are robust and provide stable readings, though they may not respond as quickly as some other sensors, and they do require a small excitation current. Their combination of robustness and long-term accuracy makes them well suited for critical locations in propulsion systems.