| | | As modern internal combustion engines face ever tighter power, efficiency and emissions requirements, gas exchange optimization is becoming increasingly important. Gas exchange analysis based on low-pressure measurements in the inlet and exhaust is a key technique in this development work. Piezoresistive measurement technology provides a suitable solution in providing high-precision absolute pressure measurements. • High-precision absolute pressure measurement • Miniaturization for highly flexible mounting • Robust construction and long service life | | In addition to suitable sensors, factors such as adapters and installation for the particular application are of considerable importance. Mounting To ensure high-quality pressure measurements in the inlet and exhaust, various mounting and flow requirements have to be taken into account. • Mount the sensors flush with the wall and at right angles to the flow • Avoid cavities between the sensor and flow passage • The pressure measuring port must offer access to a mean, representative pressure trace of the flow (i.e. not in the vicinity of separation zones, supercritical flow or extreme pressure distribution) Piezoresistive absolute pressure sensor Type 4005B... mounted in the inlet manifold | | Measurement in inlet As the inlet pressure can generally be measured with directly mounted sensors, the piezoresistive miniature absolute pressure sensor Type 4005B... is ideal. In the case of elevated flow temperatures (e.g. in engines with exhaust gas recirculation), the sensor must be cooled by means of an adapter, or the sensor Type 4007BA... considered. | | |