Piezotron ® Acoustic Emission Sensor with an integral impedance converter for measuring acoustic emissions (AE) above 50 kHz in bearing based machine structures, high pressure vessels, compressors or valves. With its small size, it easily mounts near the source of emissions to optimally capture the signal. A M6 or ¼–28\" bolt is all that is needed. Available in both intrinsically or non-intrinsically safe versions, this very rugged sensor has a welded housing for IP65 protection with high temperature operation up to 165° C 330°F","The Piezotron ® AE-Sensor consists of the sensor housing, the piezoelectric sensing element, and the built-in impedance converter. The sensing element, made of piezoelectric ceramic, is mounted on a thin steel diaphragm. Its construction determines the sensitivity and frequency response of the sensor. The coupling surface of the diaphragm welded into the housing is slightly protruded to measure the AE signals. Thus, a precisely defined coupling force results when mounting. This assures a constant and reproducible coupling for the AE transmission. The sensing element is acoustically isolated from the housing by design and therefore well protected against external noise. Kistler AE sensors feature a very high sensitivity for surface (Rayleigh) and longitudinal waves over a broad frequency range and are designed to withstand high energy waves.