ABSTRACT
In the pressure measurement continuum from the vacuum of outer space to the crushing pressure required to transform graphite into diamond, only a tiny fraction of that continuum is used for pressure measurements in the cooling of electronic systems. The three major types of pressure measuring instruments are manometers, dial gages, and electronic transducers. Flush diaphragm transducers are required to make high-frequency measurements of turbulence intensity since transducers with recessed diaphragms or attached tubing have limited frequency response due to Helmholtz or organ-pipe resonance in the cavity. For low accuracy pressure measurement requirements, such as measuring the differential pressure across filters to detect clogging, silicon-based pressure transducers developed for the automotive industry are likely candidates. The calibration of a test pressure instrument should be accomplished over the pressure and temperature ranges expected in the test.
