6045AU20-3-2

The Kistler 6045AU20-3-2 is an uncooled high-temperature piezoelectric pressure sensor for combustion engine measurements, Type 6045A. Kistler's ordering key decodes the code as the U20 heavy-duty version with a reinforced diaphragm, without PiezoSmart, with a PFA steel-braided cable 2 m long. Kistler recommends the U20 for work mainly in the knock range or with very steep pressure rises.

The 6045A uses a PiezoStar crystal and has a high sensitivity: about -44 pC/bar in the U20 version, over 0 to 300 bar (350 bar overload). It is shoulder-sealed in an M8 x 0.75 bore, with a pressed-on 1100A31 seal ring and a tightening torque of 6 N m. Its mounting dimensions match Kistler's water-cooled 6041 sensors. Kistler presents it as a general-purpose engine sensor for knock and thermodynamic measurements, and, being uncooled, for on-board use in road testing.

The sensor feeds a charge amplifier through its M4 x 0.35 connector; Kistler includes an M4 to BNC adapter (1705) when the sensor is new. The sensor can be mounted flush with the combustion chamber or in a custom M12 x 1.25 sleeve (6556AQ...). Kistler now lists the Type 6045B, which it calls a further development of the 6045A, with the same M8 mounting.