What are the design considerations for pressure measurement in high-temperature applications?

High-temperature pressure measurement design: Select sensing technology suitable for temperature (capacitive sensors up to 120C, silicon up to 150C, piezoresistive with cooling for higher). Use remote seal systems with high-temperature fill fluids (silicone oil up to 315C, NaK alloy for higher) and proper capillary sizing (thermal expansion compensation). Consider: response time degradation with capillary length, seal diaphragm material (Inconel, Hastelloy), mounting orientation for fill fluid effects, and ambient temperature compensation. Alternatively, use impulse line cooling with heat tracing control or chemical seals with integral cooling. Specify transmitter for elevated ambient rating.