An apparatus includes a header containing a sensor configured to measure pressure and a sensor body connected to the header, where the sensor body and the header form a pressure vessel configured to receive an input pressure. The header is connected to the sensor body such that the input pressure received on an inner surface of the header is substantially equal to the input pressure received on an outer surface of the header. A lowest connection point of the header to the sensor body may be located at or above a highest point at which the input pressure extends into the header. A lower portion of the header may be unconnected to the sensor body and extend into an interior volume of the sensor body. The header may include a vent configured to expose the sensor to atmospheric pressure or a lower-pressure input pressure.

An apparatus includes a sensor body and a sensor configured to measure pressure. The apparatus also includes at least one pressure input in or on the sensor body, where the at least one pressure input is configured to provide at least one input pressure to the sensor. The apparatus further includes multiple fluid passages configured to convey the at least one input pressure from the at least one pressure input to the sensor using a fill fluid. The multiple fluid passages are configured to both (i) transport the fill fluid and (ii) absorb thermal energy in a flame created by the sensor before the flame exits the sensor body. The fluid passages can include long and narrow straight passages, long and narrow curved or helical passages, and turns or bends. The fluid passages can have small cross-sections relative to their lengths.

Provided are a metal vapour pressure detection apparatus and detection method. The metal vapour pressure detection apparatus comprises a metal evaporation cavity (1) and a pressure detection mechanism (3) disposed on the outer side the metal evaporation cavity (1). The metal evaporation cavity (1) is used for melting and evaporating metal to form metal vapour. The pressure detection mechanism (3) comprises a displacement generation system and a displacement detection system disposed on the displacement generation system. The displacement generation system comprises a displacement slider sleeve (5), a displacement slider (4) disposed in the displacement slider sleeve (5), and a pressure balance spring (6) connected to the displacement slider (4). In the metal vapour pressure detection apparatus, metal vapour pressure can be directly obtained, providing a basis for online control and adjustment of metal vapour.